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Electronic Code of Federal Regulations

e-CFR Data is current as of November 25, 2014

Title 40Chapter ISubchapter CPart 81Subpart C → §81.305


Title 40: Protection of Environment
PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES
Subpart C—Section 107 Attainment Status Designations


§81.305   California.

Link to an amendment published at 78 FR 33232, June 4, 2013.

California—TSP

Designated areaDoes not meet primary standardsDoes not meet secondary standardsCannot be classifiedBetter than national standards
North Coast Air Basin:
Del Norte CountyX
Humboldt CountyX
Mendocino CountyX
Sonoma County (North Coast Air Basin portion)X
Trinity CountyX
Lake County Air BasinX
North Central Coast Air BasinX
South Central Coast Air Basin:
San Luis Obispo County:
Salinas Valley-El Pomar Estrella Planning AreaX
Non-Salinas ValleyX
Santa Barbara County (AQMA portion)X
Santa Barbara County (Non-AQMA portion):
A. West area of north-south boundary separating Santa Ynez and Lompoc Valleys:
Santa Maria AreaX
Outside Santa Maria AreaX
B. East area of north-south boundary separating Santa Ynez and Lompoc ValleysX
Ventura County:
North of 34°23 North LatitudeX
South of 34°23 North LatitudeX
Channel IslandsX
San Diego Air Basin:
San Diego County (West portion)X
San Diego County (East portion)X
South Coast Air BasinX
San Joaquin Valley Air BasinX
Sacramento Valley Air Basin (SVAB):
Sacramento CountyX
Solano County (SVAB Portion)X
Yolo CountyX
Butte CountyX
Colusa CountyX
Glenn CountyX
Shasta County (Sacramento Valley portion)X
Sutter CountyX
Tehama CountyX
Yuba CountyX
Great Basin Valleys Air Basin
Northeast Plateau Air Basin (NEPAB):
Shasta County (NEPAB portion)X
Rest of Air BasinX
Southeast Desert Air Basin:
Kern County (S.E. Desert Air Basin Portion)X
Imperial CountyX
Los Angeles County (S.E. Desert Air Basin Portion):
Lancaster Quartz Hill AreaX
Outside Lancaster Quartz Hill AreaX
Riverside County (Coachella Valley planning area)X
Riverside County (remainder of County)
San Bernardino County (S.E. Desert AQMA Portion):
Victorville AreaX
Non-Victorville AreaX
Riverside County (non-AQMA Portion)X
San Bernardino County (non-AQMA Portion)X
Lake Tahoe Air BasinX
San Francisco Bay Area Air Basin:
Solano County (S.F. Bay Area Air Basin portion)X
San Mateo CountyX
Marin CountyX
Napa CountyX
Sonoma County (S.F. Bay Area Air Basin portion)X
Alameda CountyX
Contra Costa CountyX
San Francisco CountyX
Santa Clara CountyX
Rest of Air BasinX
Mountain Counties Air Basin:
Placer County (AQMA portion)X
Placer County (excluding AQMA portion and Lake Tahoe portion)X
Amador CountyX
Calaveras CountyX
El Dorado County (excluding Lake Tahoe Air Basin portion)X
Mariposa CountyX
Nevada CountyX
Plumas CountyX
Sierra CountyX
Tuolumne CountyX

California—1971 Sulfur Dioxide NAAQS (Primary and Secondary)

Designated areaDoes not meet primary standardsDoes not meet secondary standardsCannot be classifiedBetter than national standards
North Coast Air Basin:
Del Norte CountyX
Humboldt CountyX
Mendocino CountyX
Sonoma County (North Coast Basin portion)X
Trinity CountyX
Lake County Air BasinX
San Francisco Bay Area Air BasinX
North Central Coast Air Basin:
Monterey CountyX
San Benito CountyX
Santa Cruz CountyX
South Central Coast Air Basin:
San Luis Obispo CountyX
Santa Barbara County (AQMA portion)X
Santa Barbara County (non-AQMA portion)X
Ventura CountyX
Channel IslandsX
San Diego Air Basin:
San Diego County (West portion)X
San Diego County (East portion)X
South Coast Air Basin:
Los Angeles County (South Coast Air Basin portion)X
Orange CountyX
Riverside County (South Coast Air Basin portion)X
South Coast Basin portion of San Bernardino County
San Joaquin Valley Air Basin:
Fresno CountyX
Kern CountyX
Kings CountyX
Madera CountyX
Merced CountyX
San Joaquin CountyX
Stanislaus CountyX
Tulare CountyX
Sacramento Valley Air BasinX
Great Basin Valley's Air BasinX
North East Plateau Air BasinX
Mountain Counties Air BasinX
Southeast Desert Air Basin excluding Imperial CoX
Imperial CountyX
Lake Tahoe Air BasinX

California—Carbon Monoxide

Designated AreaDesignationClassification
Date1TypeDate1Type
Bakersfield Area:
Kern County (part)
Bakersfield Metropolitan Area (Urbanized part)6/1/98Attainment
Chico Area:
Butte County (part)
Chico Urbanized Area (Census Bureau Urbanized part)
6/1/98Attainment
Fresno Area:
Fresno County (part)
Fresno Urbanized Area
6/1/98Attainment
Lake Tahoe North Shore Area:
Placer County (part)
That portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base, and Meridian (M.D.B. & M.), and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, M.D.B. & M., thence south along the west line of Sections 3 and 10, Township 15 north, Range 16 East, M.D.B. & M., to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
June 1, 1998Attainment
Lake Tahoe South Shore Area:
El Dorado County (part)
That portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake, as described under 40 CFR 81.275
6/1/98Attainment
Los Angeles-South Coast Air Basin Area6/11/07Attainment
Los Angeles County (part)—that portion of Los Angeles County which lies south and west of a line described as follows:
1. Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian;
2. Then north along the range line common to Range 8 West and Range 9 West;
3. Then west along the township line common to Township 4 North and Township 3 North;
4. Then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West;
5. Then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West;
6. Then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West);
7. Tthen west along the township line common to Township 7 North and Township 6 North;
8. Then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West;
9. Then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West;
10. Then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the township line common to Township 8 North and Township 7 North);
11. Then west along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant;
12. Then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange County:
Riverside County (part)—that portion of Riverside County which lies to the west of a line described as follows:
1. Beginning at the Riverside—San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian;
2. Then east along the township line common to Township 8 South and Township 7 South;
3. Then north along the range line common to Range 5 East and Range 4 East;
4. Then west along the township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East;
5. Then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East;
6. Then west along the township line common to Township 5 South and Township 6 South;
7. Then north along the range line common to Range 4 East and Range 3 East;
8. Then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East;
9. Then north along the range line common to Range 2 East and Range 3 East to the Riverside-San Bernardino county line.
San Bernardino County—that portion of San Bernardino County which lies south and west of a line described as follows:
1. Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian;
2. Then west along the township line common to Township 3 North and Township 2 North to the San Bernardino—Los Angeles County boundary.
Modesto Area:
Stanislaus County (part)
Modesto Urbanized Area (Census Bureau Urbanized Area)
6/1/98Attainment
Sacramento Area:
Census Bureau Urbanized Area)6/1/98Attainment
Placer County (part)
Sacramento County (part)
Yolo County (part)
San Diego Area:
San Diego County (part)
The Western Section of Air Pollution Control District of San Diego County is defined as all that portion of San Diego County, State of California, lying westerly of the following described line:
6/1/98Attainment
1. Beginning at the Northwest of Township 9 South, Range 1 West, San Bernardino Base and Meridian;
2. thence running Southerly along the West line of said township to the south line therof;
3. thence Easterly along said South line to the range line between Range 1 West and Range 1 East;
4. thence Southerly along said range line to the township line between Township 11 South and 12 South;
5. thence Easterly along said township line to the range line between Range 1 East and Range 2 East;
6. thence Southerly along said range line to the international boundary between the United States of America and Mexico.
San Francisco-Oakland-San Jose Area:
Urbanized Areas6/1/98Attainment
Alameda County (part)
Contra Costa County (part)
Marin County (part)
Napa County (part)
San Francisco County
San Mateo County (part)
Santa Clara County (part)
Solano County (part)
Sonoma County (part)
Stockton Area:
San Joaquin County (part)6/1/98Attainment
Stockton Urbanized Area
Great Basin Valley Air BasinUnclassifiable/Attainment
Alpine County
Inyo County
Mono County
Lake County Air Basin
Lake CountyUnclassifiable/Attainment
Mountain Counties Air Basin
Amador CountyUnclassifiable/Attainment
Calaveras CountyUnclassifiable/Attainment
El Dorado County (part)
excluding Lake Tahoe South ShoreUnclassifiable/Attainment
Mariposa CountyUnclassifiable/Attainment
Nevada CountyUnclassifiable/Attainment
Placer County (part)
excluding Lake Tahoe Air Basin portion and AQMA portionUnclassifiable/Attainment
AQMA portion (of Placer County)Unclassifiable/Attainment
Plumas CountyUnclassifiable/Attainment
Sierra CountyUnclassifiable/Attainment
Tuolumne CountyUnclassifiable/Attainment
North Central Coast Air Basin
Monterey CountyUnclassifiable/Attainment
San Benito CountyUnclassifiable/Attainment
Santa Cruz CountyUnclassifiable/Attainment
North Coast Air BasinUnclassifiable/Attainment
Del Norte County
Humboldt County
Mendocino County
Sonoma County (part)
Remainder of County
Trinity County
Northeast Plateau Air BasinUnclassifiable/Attainment
Lassen County
Modoc County
Siskiyou County
Sacramento Valley Air Basin (portion)
Butte County (part)
Area other than Chico Urbanized Area (Census Bureau urbanized part)Unclassifiable/Attainment
Colusa CountyUnclassifiable/Attainment
Glenn CountyUnclassifiable/Attainment
Sacramento County (part)
Area other than Census Bureau urbanized areasUnclassifiable/Attainment
Shasta CountyUnclassifiable/Attainment
Solano County (part)
Sacramento Valley Air Basin portionUnclassifiable/Attainment
Sutter CountyUnclassifiable/Attainment
Tehama CountyUnclassifiable/Attainment
Yolo County (part)
Area outside Census Bureau urbanized areasUnclassifiable/Attainment
Yuba CountyUnclassifiable/Attainment
San Diego Air Basin (Remainder of)
San Diego County (part)
Remainder of CountyUnclassifiable/Attainment
San Francisco Bay Area Air BasinUnclassifiable/Attainment
Area other than urbanized Areas
Alameda County (part)
Contra Costa County (part)
Marin County (part)
Napa County (part)
San Mateo County (part)
Santa Clara County (part)
Solano County (part)
Sonoma County (part)
San Joaquin Valley Air Basin
Fresno County (part)
Outside Fresno Urbanized AreaUnclassifiable/Attainment
Kern County (part)
Area other than Bakersfield Metropolitan Area (Urbanized part)Unclassifiable/Attainment
Kings CountyUnclassifiable/Attainment
Madera CountyUnclassifiable/Attainment
Merced CountyUnclassifiable/Attainment
San Joaquin County (part)
Outside Stockton urbanized areaUnclassifiable/Attainment
Stanislaus County (part)
Outside Modesto Urbanized Area (Census Bureau Urbanized Area)Unclassifiable/Attainment
Tulare CountyUnclassifiable/Attainment
South Central Coast Air Basin
Channel IslandsUnclassifiable/Attainment
San Luis Obispo CountyUnclassifiable/Attainment
Santa Barbara CountyUnclassifiable/Attainment
Ventura CountyUnclassifiable/Attainment
Southeast Desert Air Basin
Imperial CountyUnclassifiable/Attainment
Kern County (part)
excluding San Joaquin Valley portionUnclassifiable/Attainment
Los Angeles County
excluding Los Angeles - South Coast Air Basin portionUnclassifiable/Attainment
Riverside County (part) Portion excluding Los Angeles-South Coast Air BasinUnclassifiable/Attainment.
San Bernardino Co(part)
AQMA portion (excluding Los Angeles - South Coast Air Basin)Unclassifiable/Attainment
Non-AQMA portion (excluding Los Angeles - South Coast Air Basin)Unclassifiable/Attainment

1This date is November 15, 1990, unless otherwise noted.

California—Ozone (1-Hour Standard)4

Designated area Designation Classification
Date1 Type Date1 Type
Chico Area:
Butte County(3)Nonattainment(3)Sec. 185A Area.2
Imperial County Area:
Imperial County11/15/90Nonattainment11/15/90Sec. 185A Area.2
Los Angeles-South Coast Air Basin Area511/15/90Nonattainment11/15/90Extreme.
Los Angeles County (part)11/15/90Nonattainment11/15/90Extreme.
That portion of Los Angeles County which lies south and west of a line described as follows:
1. Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian;
2. then north along the range line common to Range 8 West and Range 9 West;
3. then west along the Township line common to Township 4 North and Township 3 North;
4. then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West;
5. then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West;
6. then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West);
7. then west along the Township line common to Township 7 North and Township 6 North;
8. then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West;
9. then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West;
10. then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North);
11. then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant;
12. then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange County11/15/90Nonattainment11/15/90Extreme.
Riverside County (part)11/15/90Nonattainment11/15/90Extreme.
That portion of Riverside County which lies to the west of a line described as follows:
1. Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian;
2. then east along the Township line common to Township 8 South and Township 7 South;
3. then north along the range line common to Range 5 East and Range 4 East;
4. then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East;
5. then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East;
6. then west along the Township line common to Township 5 South and Township 6 South;
7. then north along the range line common to Range 4 East and Range 3 East;
8. then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East;
9. then north along the range line common to Range 2 East and Range 3 East to the Riverside-San Bernardino County line.
San Bernardino County (part)11/15/90Nonattainment11/15/90Extreme.
That portion of San Bernardino County which lies south and west of a line described as follows:
1. Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian;
2. then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Morongo Band of Mission Indians611/15/90Nonattainment11/15/90Severe-17.
Monterey Bay AreaAttainment
Monterey County
San Benito County
Santa Cruz County
Sacramento Metro Area11/15/90Nonattainment6/01/95Severe-15.
El Dorado County (part):
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part):
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian (M.D.B. & M.), and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, M.D.B. & M., thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, M.D.B. & M., to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning.11/15/90Nonattainment6/01/95Severe-15.
Sacramento County11/15/90Nonattainment6/01/95Severe-15.
Solano County (part) That portion of Solano County which lies north and east of a line described as follows:11/15/90Nonattainment6/01/95Severe-15.
Description of boundary in Solano county between San Francisco and Sacramento: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34; T. 6 N., R. 2 W., M.D.B. & M., thence east along said 1/4 section line to the east boundary of Section 36, T. 6 N., R. 2 W., thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T. 5 N., R. 1 W., thence east along a line common to T. 5 N. and T. 6 N. to the northeast corner of Section 3, T. 5 N., R. 1 E., thence south along section lines to the southeast corner of Section 10, T. 3 N., R. 1 E., thence east along section lines to the south 1/4 corner of Section 8, T. 3 N., R. 2 E., thence east to the boundary between Solano and Sacramento Counties11/15/90Nonattainment6/01/95Severe-15.
Sutter County (part—southern portion)South of a line connecting the northern border of Yolo Co. to the SW tip of Yuba Co. and continuing along the southern Yuba County border to Placer County.11/15/90Nonattainment6/01/95Severe-15.
Yolo County11/15/90Nonattainment6/01/95Severe-15.
San Diego Area:
San Diego County7/28/03Attainment
San Francisco-Bay Area8/10/98Nonattainment8/10/98Not classified/Moderate under 23 U.S.C.
      8/23/99104(b)(2).
Alameda County8/10/98......do8/23/99      Do.
Contra Costa County8/10/98......do8/23/99      Do.
Marin County8/10/98......do8/23/99      Do.
Napa County8/10/98......do8/23/99      Do.
San Francisco County8/10/98......do8/23/99      Do.
San Mateo County8/10/98......do8/23/99      Do.
Santa Clara County8/10/98......do8/23/99      Do.
Solano County (part)8/10/98......do8/23/99      Do.
That portion of the county that lies south and west of the line described that follows: Description of boundary in Solano County between San Francisco and Sacramento: Beginning at the intersection at the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34; T.6 N., R. 2 W., M.D.B. & M., thence east along said 1/2 section line to the east boundary of Section 36, T. 6 N., R. 2 W., thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T. 5 N., R. 1 W, thence east along a line common to T. 5 N., and T. 6 N. to the northeast corner of Section 3, T. 5 N., R. 1 E., thence south along section lines to the southeast corner of Section 10 T. 3 N., R. 1 E., thence east along section lines to the south 1/4 corner of Section 8 T. 3 N., R. 2 E., thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part)8/10/98......do8/23/99      Do.
That portion of Sonoma county which lies south and east of a line described as follows: Beginning at the south-easterly corner of the Rancho Estero Americano, being on the boundary line between Marin Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive, thence running along said boundary of Rancho Canada de Jonive westerly,; northerly and easterly to its intersection with the easterly line of Granton Road; thence running along the easterly and southerly line of Granton Road northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly and northerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road: thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Ranco Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 north, Mt. Diablo Base and Meridian; thence running easterly along said Township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California.
East Kern County:
That portion of Kern County that lies east and south of a line described below: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East, then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County Boundary6/21/04Attainment
San Joaquin Valley Area:
Fresno County11/15/90Nonattainment05/17/04Extreme
Kern County (part). That portion of Kern County that lies west and north of a line described below:11/15/90Nonattainment05/17/04Extreme
Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Pliebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary:
Kings County11/15/90Nonattainment05/17/04Extreme
Madera County11/15/90Nonattainment05/17/04Extreme
Merced County11/15/90Nonattainment05/17/04Extreme
San Joaquin County11/15/90Nonattainment05/17/04Extreme
Stanislaus County11/15/90Nonattainment05/17/04Extreme
Tulare County11/15/90Nonattainment05/17/04Extreme
Santa Barbara-Santa Maria-Lompoc Area:
Santa Barbara County8/8/03Attainment
Southeast Desert Modified AQMA Area11/15/90Nonattainment11/15/90Severe-17.
Los Angeles County (part)—that portion of Los Angeles County which lies north and east of a line described as follows:
1. Beginning at the Los Angeles—San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian;
2. then north along the range line common to Range 8 West and Range 9 West;
3. then west along the Township line common to Township 4 North and Township 3 North;
4. then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West;
5. then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West;
6. then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West);
7. then west along the Township line common to Township 7 North and Township 6 North;
8. then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West;
9. then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West;
10. then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North);
11. then west along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant;
12. then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Riverside County11/15/90Nonattainment11/15/90Severe-17
Coachella Valley planning area—that portion of Riverside County which lies to the east of a line described as follows:
1. Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian;
2. then east along the Township line common to Township 8 South and Township 7 South;
3. then north along the range line common to Range 5 East and Range 4 East;
4. then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East;
5. then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East;
6. then west along the Township line common to Township 5 South and Township 6 South;
7. then north along the range line common to Range 4 East and Range 3 East;
8. then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East;
9. then north along the range line common to Range 2 East and Range 3 East to the Riverside-San Bernardino County line and that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows:
10. Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian;
11. then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, elevation 4504 feet;
12. then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East;
13. then north along the range line common to Range 14 East and Range 13 East;
14. then west and northwest along the ridge line to Monument Mountain, elevation 4834 feet;
15. then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elevation 5814 feet;
16. then northwest along the ridge line to the Riverside-San Bernardino County line
San Bernadino County (part)—that portion of San Bernardino County which lies north and east of a line described as follows:11/15/90Nonattainment11/15/90Severe-17.
1. Beginning at the San Bernardino—Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian;
2. then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino—Los Angeles County boundary; and that portion of San Bernardino County which lies south and west of a line described as follows:
3. latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Ventura County Area:
Ventura County11/15/90Nonattainment11/15/90Severe-15.
Yuba City Area:
Sutter County (part—northern portion)(3)Nonattainment(3)Sec. 185A Area.2.
North of a line connecting the northern border of Yolo County to the SW tip of Yuba County and continuing along the southern Yuba County border to Placer County.
Yuba County(3)Nonattainment(3)Sec. 185A Area.2.
Great Basin Valleys Air BasinUnclassifiable/Attainment
Alpine County
Inyo County
Mono County
Lake County Air BasinUnclassifiable/Attainment
Lake County
Lake Tahoe Air BasinUnclassifiable/Attainment
El Dorado County (part)
Lake Tahoe Area: As described under 40 CFR 81.275.
Placer County (part)
Lake Tahoe Area: As described under 40 CFR 81.275.
Mountain Counties Air Basin (Remainder of):
Amador County11/15/90Unclassifiable/Attainment11/15/90
Calaveras County11/15/90Unclassifiable/Attainment11/15/90
Mariposa CountyUnclassifiable/Attainment
Nevada CountyUnclassifiable/Attainment
Plumas CountyUnclassifiable/Attainment
Sierra CountyUnclassifiable/Attainment
Tuolumne CountyUnclassifiable/Attainment
North Coast Air BasinUnclassifiable/Attainment
Del Norte County
Humboldt County
Mendocino County
Sonoma County (part)
Remainder of County
Trinity County
Northeast Plateau Air BasinUnclassifiable/Attainment
Lassen County
Modoc County
Siskiyou Couny
Sacramento Valley Air Basin (Remainder of):
Colusa CountyUnclassifiable/Attainment
Glenn CountyUnclassifiable/Attainment
Shasta CountyUnclassifiable/Attainment
Tehama CountyUnclassifiable/Attainment
South Central Coast Air Basin (Remainder of):
Channel IslandsUnclassifiable/Attainment
San Luis Obispo CountyUnclassifiable/Attainment
Southeast Desert NON-AQMA:
Riverside County (part)
Remainder of countyUnclassifiable/Attainment
San Bernadino County (part)
Remainder of countyUnclassifiable/Attainment

1This date is October 18, 2000 unless otherwise noted.

2An area designated as an ozone nonattainment area as of the date of enactment of the CAAA of the 1990 that did not violate the ozone NAAQS during the period of 1987-1989.

3This date is January 16, 2001.

4The 1-hour ozone standard is revoked effective June 15, 2005 for all areas in California. The Monterey Bay, San Diego, and Santa Barbara-Santa Maria-Lompoc areas are maintenance areas for the 1-hour NAAQS for purposes of 40 CFR part 51 subpart X.

5Excludes Morongo Band of Mission Indians' Indian country in Riverside County.

6 Includes Indian country of the tribe listed in this table. Information pertaining to areas of Indian country in this table is intended for CAA planning purposes only and is not an EPA determination of Indian country status or any Indian country boundary. EPA lacks the authority to establish Indian country land status, and is making no determination of Indian country boundaries, in this table.

California—PM-10

Designated AreaDesignationClassification
DateTypeDateType
Inyo County
Coso Junction planning areaOctober 4, 2010Attainment
That portion of Inyo County contained within Hydrologic Unit #18090205
Owens Valley planning area11/15/90Nonattainment02/08/93Serious
Hydrologic Unit #18090103
Sacramento County1/20/94Nonattainment1/20/94Moderate
San Bernardino County:
San Bernardino (part):
Excluding that portion located in the Trona planning area and excluding that portion located in the South Coast Air Basin1/20/94Nonattainment1/20/94Moderate.
Trona planning area: That portion of San Bernardino County contained within Hydrologic Unit #180902859/5/02Nonattainment9/5/02Moderate
Mono County
Mammoth Lake planning area11/15/90Nonattainment11/15/90Moderate
Includes the following sections:
a. Sections 1-12, 17, and 18 of Township T4S, R28E;
b. Sections 25-36 of Township T3S, R28E;
c. Sections 25-36 of Township T3S, R27E;
d. Sections 1-18 of Township T4S, R27E; and
e. Sections 25 and 36 of Township T3S, R26E
Mono Basin
Hydrologic Unit 180901012/29/93Nonattainment12/29/93Moderate
Fresno, Kern, Kings, Madera, Merced, San Joaquin, Stanislaus, Tulare Counties:
Indian Wells Valley planning area: That portion of Kern County contained within Hydrologic Unit #180902056/6/03Attainment
San Joaquin Valley Air Basin; Fresno County, Kings County, Madera County, Merced County, San Joaquin County, Stanislaus County, Tulare County, and that portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary12/12/08Attainment
East Kern: That portion of Kern County which lies between the following two lines (with the exception of that portion in Hydrologic Unit Number 18090205—the Indian Wells Valley):11/15/90Nonattainment02/08/93Serious.
(1) West and north of a line described as follows: Beginning at the southwest corner of section 31, T. 10 N 16 W and running east to the northwest boundary of the Rancho La Liebre Land Grant; then running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to R. 15 W. and R. 16 W., San Bernardino Base and Meridian; then north along the range line to the northwest corner of section 2, T. 32 S., R. 32 E., Mount Diablo Base and Meridian; then east along the township line common to T. 32 S. and T. 31 S.; then north along the range line common to R. 35 E. and R. 34 E.; then east along the township line common to T. 29 S. and T. 28 S.; then north along the range line common to R. 36 E. and R. 35 E.; then east along the township line common to T. 28 S. and T. 27 S.; then north along the range line common to R. 37 E. and R. 36 E. to the Kern-Tulare County boundary
(2) East and south of a line of a line described as follows: Beginning at the southwest corner of section 31, T. 10 N 16 W and running north along the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Riverside, Los Angeles, Orange, and San Bernardino Counties
South Coast Air Basin7/26/13Attainment
Riverside County
Coachella Valley planning area11/15/90Nonattainment02/08/93Serious.
Imperial County
Imperial Valley planning area: That portion of Imperial County that is defined as follows:
11/15/90Nonattainment9/10/04Serious
Commencing at the southwest corner of Imperial County and extending north along the Imperial-San Diego County line to the northwest corner of Imperial County; then east along the Imperial-Riverside County line to the point of intersection of the eastern boundary line of Hydrologic Unit #18100200; then southeasterly along the eastern boundary line of Hydrologic Unit #18100200 to the Imperial County-Mexico Border; then west along the Imperial County-Mexico Border to the point of the beginning

California—1997 Annual PM2.5 NAAQS

[Primary and secondary]

Designated areaDesignationaClassification
Date1TypeDate2Type
Los Angeles-South Coast Air Basin, CA:
Los Angeles County (part)NonattainmentModerate
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange CountyNonattainmentModerate.
Riverside County (part)NonattainmentModerate.
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line
San Bernardino County (part)NonattainmentModerate.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary
San Diego, CA:
San Diego CountyUnclassifiable/Attainment
San Joaquin Valley, CA:
Fresno CountyNonattainmentModerate.
Kern County (part)NonattainmentModerate.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Kings CountyNonattainmentModerate.
Madera CountyNonattainmentModerate.
Merced CountyNonattainmentModerate.
San Joaquin CountyNonattainmentModerate.
Stanislaus CountyNonattainmentModerate.
Tulare CountyNonattainmentModerate.
North Coast Air Basin:
Del Norte CountyUnclassifiable/Attainment
Humboldt CountyUnclassifiable/Attainment
Mendocino CountyUnclassifiable/Attainment
Sonoma County (part)Unclassifiable/Attainment
That portion of Sonoma county which lies north and west of a line described as follows: Beginning at the south-easterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive, thence running along said boundary of Rancho Canada de Jonive westerly; northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly and northerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road: thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 north, Mt. Diablo Base and Meridian; thence running easterly along said Township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California
Trinity County3/7/11Unclassifiable/Attainment
Northeast Plateau Air Basin:
Lassen County3/7/11Unclassifiable/Attainment
Modoc County3/7/11Unclassifiable/Attainment
Siskiyou County3/7/11Unclassifiable/Attainment
Lake County Air Basin:
Lake CountyUnclassifiable/Attainment
Upper Sacramento Valley Region:
Butte County (remainder)3/7/11Unclassifiable/Attainment
Colusa CountyUnclassifiable/Attainment
Glenn CountyUnclassifiable/Attainment
Shasta County3/7/11Unclassifiable/Attainment
Sutter County (part)Unclassifiable/Attainment
Tehama County3/7/11Unclassifiable/Attainment
Yuba County (remainder)3/7/11Unclassifiable/Attainment
Sacramento Metropolitan Region:
El Dorado County (part)Unclassifiable/Attainment
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake
Placer County (part)Unclassifiable/Attainment
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
Sacramento CountyUnclassifiable/Attainment
Solano County (part)Unclassifiable/Attainment
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1/4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties
Sutter County (part)Unclassifiable/Attainment
That portion south of a line connecting the northern border of Yolo County to the southwest tip of Yuba County and continuing along the southern Yuba County border to Placer County
Yolo CountyUnclassifiable/Attainment
Northern Mountain Counties:
Nevada CountyUnclassifiable/Attainment.
Plumas County3/7/11Unclassifiable/Attainment
Sierra County3/7/11Unclassifiable/Attainment
Central Mountain Counties:
Amador CountyUnclassifiable/Attainment
Calaveras CountyUnclassifiable/Attainment
Southern Mountain Counties:
Mariposa CountyUnclassifiable/Attainment
Tuolumne CountyUnclassifiable/Attainment
Lake Tahoe Air Basin:
El Dorado County (part)Unclassifiable/Attainment
That portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part)Unclassifiable/Attainment
That portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
San Francisco Bay Area Air Basin:
Alameda CountyUnclassifiable/Attainment
Contra Costa CountyUnclassifiable/Attainment
Marin CountyUnclassifiable/Attainment
Napa CountyUnclassifiable/Attainment
San Francisco CountyUnclassifiable/Attainment
San Mateo CountyUnclassifiable/Attainment
Santa Clara CountyUnclassifiable/Attainment
Solano County (part)Unclassifiable/Attainment
Portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1/4 section line to the east boundary of Section 36, T6N, R2W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties
Sonoma County (part)Unclassifiable/Attainment.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties
North Central Coast Air Basin:
Monterey CountyUnclassifiable/Attainment
San Benito CountyUnclassifiable/Attainment
Santa Cruz CountyUnclassifiable/Attainment
San Luis Obispo County:
San Luis Obispo CountyUnclassifiable/Attainment
Santa Barbara County:
Santa Barbara County (part)Unclassifiable/Attainment
Excluding San Miguel, Santa Rosa, Santa Cruz, and Santa Barbara Islands
Santa Barbara County (part)Unclassifiable/Attainment
San Miguel, Santa Rosa, Santa Cruz, and Santa Barbara Islands.
Ventura County:
Ventura County (part)Unclassifiable/Attainment
Excluding Anacapa and San Nicolas Islands.
Ventura County (part)Unclassifiable/Attainment
Anacapa and San Nicolas Islands.
Great Basin Valleys Air Basin:
Alpine CountyUnclassifiable/Attainment
Inyo County (part)Unclassifiable/Attainment
That portion of Inyo County that lies outside Hydrologic Unit Number 18090205.
Mono CountyUnclassifiable/Attainment
Coso Junction:
Inyo County (part)Unclassifiable/Attainment
That portion of Inyo County that lies inside Hydrologic Unit Number 18090205.
Eastern Kern County:
Kern County (part)Unclassifiable/Attainment
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205—the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern—Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary
Indian Wells Valley:
Kern County (part)Unclassifiable/Attainment
That portion of Kern County that lies inside Hydrologic Unit Number 18090205.
Western Mojave Desert and Antelope Valley:
Los Angeles County (part)Unclassifiable/Attainment
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles—San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Trona:
San Bernardino County (part)Unclassifiable/Attainment
That portion of San Bernardino County that lies inside Hydrologic Unit Number 18090205.
Coachella Valley:
Riverside County (part)Unclassifiable/Attainment
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside—San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East;, to the Riverside-San Bernardino County line: And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, elevation 4504'; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834'; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814'; then northwest along the ridge line to the Riverside-San Bernardino County line.
Far Eastern Riverside and San Bernardino Counties:
San Bernardino County (remainder)Unclassifiable/Attainment
Riverside County (remainder)Unclassifiable/Attainment.
Imperial County:
Imperial CountyUnclassifiable/Attainment.

aIncludes Indian Country located in each county or area, except as otherwise specified.

1This date is 90 days after January 5, 2005, unless otherwise noted.

2This date is July 2, 2014, unless otherwise noted.

California—1997 24-Hour PM2.5 NAAQS

[Primary and secondary]

Designated areaDesignationaClassification
Date1TypeDate2Type
Chico, CA:
Butte County (part)Unclassifiable/Attainment
That portion of Butte County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Butte-Yuba county line and the township line common to T18N R6E and T19N R6E, west to the township line common to T18N R6E and T19N R6E, then north along the range line common to R5E and R6E, then west along the township line common to T21N and T20N, then north along the range line common to R4E and R5E, then west along the township line common to T24N and T23N to the Butte-Tehama County boundary.
Imperial County, CA:
Imperial County (part)Unclassifiable/Attainment
That portion of Imperial County which lies within the line described as follows: (San Bernardino Base and Meridan) Beginning at the intersection of the United States-Mexico border and the southeast corner of T17S R11E, then north along the range line of the eastern edge of range R11E, then east along the township line of the southern edge of T12S to the northeast corner of T13S R15E, then south along the range line common to R15E and R16E, to the United States-Mexico border.
Los Angeles-South Coast Air Basin, CA:
Los Angeles County (part)NonattainmentModerate.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then North along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange CountyNonattainmentModerate.
Riverside County (part)NonattainmentModerate.
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County Line (excluding the lands of the Santa Rosa Band of Cahuilla Mission Indians).
That part of the lands of the Santa Rosa Band of Cahuilla Mission Indians which is excluded from the Riverside County (part) nonattainment areaNonattainmentModerate.
San Bernardino County (part)NonattainmentModerate.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Sacramento, CA:
El Dorado County (part)Unclassifiable/Attainment
That portion of El Dorado County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of El Dorado-Amador county line and the township line common to townships T8N R10E and T8N R11E, then north along the range line common to ranges R10E and R11E, then east along the township line common to T9N and T8N, then north along the range line common to ranges R12E and R13E, then west along the township line common to T12N and T11N, then north along the range line common to ranges R10E and R11E, then west along the township line common to T13N and T12N, then north along the range line common to ranges R9E and R10E, to the El Dorado-Placer County boundary.
Placer County (part)Unclassifiable/Attainment
That portion of Placer County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Placer-El Dorado County line and the township line common to townships T12N R9E and T13N R9E, then running west along the township line common to townships T12N R9E and T13N R9E, then north along the range line common to ranges R8E and R9E, to the Placer-Nevada County boundary.
Sacramento CountyUnclassifiable/Attainment
Solano County (part)Unclassifiable/Attainment
That portion of Solano County which lies north and east of a line described as follows: beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1/4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Yolo County (part)Unclassifiable/Attainment
That portion of Yolo County which lies east of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of Yolo-Solano County boundary and the range line of the eastern edge of township T8N R2W, north along the range line of the eastern edge of township T8N R2W, continuing north along the range line common to ranges R2W and R1W, to the Yolo-Colusa County boundary.
San Francisco Bay Area, CA:
Alameda CountyUnclassifiable/Attainment
Contra Costa CountyUnclassifiable/Attainment
Marin CountyUnclassifiable/Attainment
Napa CountyUnclassifiable/Attainment
San Francisco CountyUnclassifiable/Attainment
San Mateo CountyUnclassifiable/Attainment
Santa Clara CountyUnclassifiable/Attainment
Solano County (part)Unclassifiable/Attainment
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part)Unclassifiable/Attainment.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
San Joaquin Valley, CA:
Fresno CountyNonattainmentModerate.
Kern County (part)NonattainmentModerate.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of Sec. 3, T11N, R17W; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Sec. 34, T32S, R30E Mount Diablo Base And Meridian; then north to the northwest corner of Sec. 35, T31S, R30E; then Northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Sec. 18, T. 31 S., R. 31 E.; then east to the southeast corner of Sec. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of Sec. 6, T. 29 S., R. 32 E.; then east to the southwest corner of Sec. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of Sec. 6, T. 28 S., R. 32 E., then west to the southeast corner of Sec. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary.
Kings CountyNonattainmentModerate.
Madera CountyNonattainmentModerate.
Merced CountyNonattainmentModerate.
San Joaquin CountyNonattainmentModerate.
Stanislaus CountyNonattainmentModerate.
Tulare CountyNonattainmentModerate.
Yuba City-Marysville, CA:
Sutter CountyUnclassifiable/Attainment
Yuba County (part)Unclassifiable/Attainment
That portion of Yuba County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Yuba-Nevada county line and the range line common to ranges R7E and R8E, north to the southeast corner of township T18N R7E, then west along the township line common to T17N and T18N, then north along the range line common to ranges R6E and R7E, then west along the township line common to T19N and T18N to the Yuba-Butte County boundary.
North Coast Air Basin:
Del Norte CountyUnclassifiable/Attainment
Humboldt CountyUnclassifiable/Attainment
Mendocino CountyUnclassifiable/Attainment
Sonoma County (part)Unclassifiable/Attainment
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive, thence running along said boundary of Rancho Canada de Jonive westerly; northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly and northerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road: thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 north, Mt. Diablo Base and Meridian; thence running easterly along said Township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California.
Trinity CountyUnclassifiable/Attainment
Northeast Plateau Air Basin:
Lassen CountyUnclassifiable/Attainment
Modoc CountyUnclassifiable/Attainment.
Siskiyou CountyUnclassifiable/Attainment
Lake County Air Basin:
Lake CountyUnclassifiable/Attainment
Upper Sacramento Valley Region:
Butte County (remainder)Unclassifiable/Attainment
Colusa CountyUnclassifiable/Attainment
Glenn CountyUnclassifiable/Attainment
Shasta CountyUnclassifiable/Attainment
Tehama CountyUnclassifiable/Attainment
Yuba County (remainder)Unclassifiable/Attainment
Sacramento Metropolitan Region:
Yolo County (remainder)Unclassifiable/Attainment
Northern Mountain Counties:
Nevada CountyUnclassifiable/Attainment
Plumas CountyUnclassifiable/Attainment
Sierra CountyUnclassifiable/Attainment
Central Mountain Counties:
Amador CountyUnclassifiable/Attainment
Calaveras CountyUnclassifiable/Attainment
Southern Mountain Counties:
Mariposa CountyUnclassifiable/Attainment
Tuolumne CountyUnclassifiable/Attainment
Lake Tahoe Air Basin:
El Dorado County (remainder)Unclassifiable/Attainment
Placer County (remainder)Unclassifiable/Attainment
North Central Coast Air Basin:
Monterey CountyUnclassifiable/Attainment
San Benito CountyUnclassifiable/Attainment
Santa Cruz CountyUnclassifiable/Attainment
San Luis Obispo County:
San Luis Obispo CountyUnclassifiable/Attainment
Santa Barbara County:
Santa Barbara County (part)Unclassifiable/Attainment
Excluding San Miguel, Santa Rosa, Santa Cruz and Santa Barbara Islands
Santa Barbara County (part)Unclassifiable/Attainment
San Miguel, Santa Rosa, Santa Cruz and Santa Barbara Islands
Ventura County:
Ventura County (part)Unclassifiable/Attainment
Excluding Anacapa and San Nicolas Islands.
Ventura County (part)Unclassifiable/Attainment
Anacapa and San Nicolas Islands.
Great Basin Valleys Air Basin:
Alpine CountyUnclassifiable/Attainment
Inyo County (part)Unclassifiable/Attainment
That portion of Inyo County that Lies outside Hydrologic Unit Number 18090205.
Mono CountyUnclassifiable/Attainment
Coso Junction:
Inyo County (part)Unclassifiable/Attainment
That portion of Inyo County that lies inside Hydrologic Unit Number 18090205.
Eastern Kern County:
Kern County (part)Unclassifiable/Attainment
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205—the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; Then northwest Along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary.
Indian Wells Valley:
Kern County (part)Unclassifiable/Attainment
That portion of Kern County that lies inside Hydrologic Unit Number 18090205.
Western Mojave Desert and Antelope Valley:
Los Angeles County (part)Unclassifiable/Attainment
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
San Bernardino County (part)Unclassifiable/Attainment
That portion of San Bernardino County (with the exception of that portion in Hydrologic Unit Number 18090205) which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; And that portion of San Bernardino County which lies south and west of a line described as follows: latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Trona:
San Bernardino County (part)Unclassifiable/Attainment
That portion of San Bernardino County that lies inside Hydrologic Unit Number 18090205.
Coachella Valley:
Riverside County (part)Unclassifiable/Attainment
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then North along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line: And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, Elevation 4504; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814; then northwest along the ridge line to the Riverside-San Bernardino County line.
Far Eastern Riverside and San Bernardino Counties:
San Bernardino County (remainder)Unclassifiable/Attainment.
Riverside County (remainder)Unclassifiable/Attainment.
Imperial County (remainder)Unclassifiable/Attainment
San Diego CountyUnclassifiable/Attainment

aIncludes Indian Country located in each county or area, except as otherwise specified.

1This date is 90 days after January 5, 2005, unless otherwise noted.

2This date is July 2, 2014, unless otherwise noted.

California—2006 24-Hour PM2.5 NAAQS

[Primary and secondary]

Designated areaDesignationaClassification
Date1TypeDate2Type
Chico, CA:
Butte County (part)NonattainmentModerate.
That portion of Butte County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Butte-Yuba county line and the township line common to T18N R6E and T19N R6E, west to the township line common to T18N R6E and T19N R6E, then north along the range line common to R5E and R6E, then west along the township line common to T21N and T20N, then north along the range line common to R4E and R5E, then west along the township line common to T24N and T23N to the Butte-Tehama County boundary.
Imperial County, CA:
Imperial County (part)NonattainmentModerate.
That portion of Imperial County which lies within the line described as follows: (San Bernardino Base and Meridian) Beginning at the intersection of the United States-Mexico border and the southeast corner of T17S R11E, then north along the range line of the eastern edge of range R11E, then east along the township line of the southern edge of T12S to the northeast corner of T13S R15E, then south along the range line common to R15E and R16E, to the United States-Mexico border.
Los Angeles-South Coast Air Basin, CA:
Los Angeles County (part)NonattainmentModerate.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then North along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange CountyNonattainmentModerate.
Riverside County (part)NonattainmentModerate.
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County Line (excluding the lands of the Santa Rosa Band of Cahuilla Mission Indians).
That part of the lands of the Santa Rosa Band of Cahuilla Mission Indians which is excluded from the Riverside County (part) nonattainment areaUnclassifiable/Attainment
San Bernardino County (part)NonattainmentModerate.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Sacramento, CA:
El Dorado County (part)NonattainmentModerate.
That portion of El Dorado County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of El Dorado-Amador county line and the township line common to townships T8N R10E and T8N R11E, then north along the range line common to ranges R10E and R11E, then east along the township line common to T9N and T8N, then north along the range line common to ranges R12E and R13E, then west along the township line common to T12N and T11N, then north along the range line common to ranges R10E and R11E, then west along the township line common to T13N and T12N, then north along the range line common to ranges R9E and R10E, to the El Dorado-Placer County boundary.
Placer County (part)NonattainmentModerate.
That portion of Placer County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Placer-El Dorado County line and the township line common to townships T12N R9E and T13N R9E, then running west along the township line common to townships T12N R9E and T13N R9E, then north along the range line common to ranges R8E and R9E, to the Placer-Nevada County boundary.
Sacramento CountyNonattainmentModerate.
Solano County (part)NonattainmentModerate.
That portion of Solano County which lies north and east of a line described as follows: beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1/4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Yolo County (part)NonattainmentModerate.
That portion of Yolo County which lies east of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of Yolo-Solano County boundary and the range line of the eastern edge of township T8N R2W, north along the range line of the eastern edge of township T8N R2W, continuing north along the range line common to ranges R2W and R1W, to the Yolo-Colusa County boundary.
San Francisco Bay Area, CA:
Alameda CountyNonattainmentModerate.
Contra Costa CountyNonattainmentModerate.
Marin CountyNonattainmentModerate.
Napa CountyNonattainmentModerate.
San Francisco CountyNonattainmentModerate.
San Mateo CountyNonattainmentModerate.
Santa Clara CountyNonattainmentModerate.
Solano County (part)NonattainmentModerate.
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part)NonattainmentModerate.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
San Joaquin Valley, CA:
Fresno CountyNonattainmentModerate.
Kern County (part)NonattainmentModerate.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of Sec. 3, T11N, R17W; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Sec. 34, T32S, R30E Mount Diablo Base And Meridian; then north to the northwest corner of Sec. 35, T31S, R30E; then Northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Sec. 18, T. 31 S., R. 31 E.; then east to the southeast corner of Sec. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of Sec. 6, T. 29 S., R. 32 E.; then east to the southwest corner of Sec. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of Sec. 6, T. 28 S., R. 32 E., then west to the southeast corner of Sec. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary.
Kings CountyNonattainmentModerate.
Madera CountyNonattainmentModerate.
Merced CountyNonattainmentModerate.
San Joaquin CountyNonattainmentModerate.
Stanislaus CountyNonattainmentModerate.
Tulare CountyNonattainmentModerate.
Yuba City-Marysville, CA:
Sutter CountyNonattainmentModerate.
Yuba County (part)NonattainmentModerate.
That portion of Yuba County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Yuba-Nevada county line and the range line common to ranges R7E and R8E, north to the southeast corner of township T18N R7E, then west along the township line common to T17N and T18N, then north along the range line common to ranges R6E and R7E, then west along the township line common to T19N and T18N to the Yuba-Butte County boundary.
Rest of State:
North Coast Air Basin:
Del Norte CountyUnclassifiable/Attainment
Humboldt CountyUnclassifiable/Attainment
Mendocino CountyUnclassifiable/Attainment
Sonoma County (part)Unclassifiable/Attainment
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive, thence running along said boundary of Rancho Canada de Jonive westerly; northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly and northerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road: thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 north, Mt. Diablo Base and Meridian; thence running easterly along said Township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California.
Trinity CountyUnclassifiable/Attainment
Northeast Plateau Air Basin:
Lassen CountyUnclassifiable/Attainment
Modoc CountyUnclassifiable/Attainment
Siskiyou CountyUnclassifiable/Attainment
Lake County Air Basin:
Lake CountyUnclassifiable/Attainment
Upper Sacramento Valley Region:
Butte County (remainder)Unclassifiable/Attainment
Colusa CountyUnclassifiable/Attainment
Glenn CountyUnclassifiable/Attainment
Shasta CountyUnclassifiable/Attainment
Tehama CountyUnclassifiable/Attainment
Yuba County (remainder)Unclassifiable/Attainment
Sacramento Metropolitan Region:
Yolo County (remainder)Unclassifiable/Attainment
Northern Mountain Counties:
Nevada CountyUnclassifiable/Attainment
Plumas CountyUnclassifiable/Attainment
Sierra CountyUnclassifiable/Attainment
Central Mountain Counties:
Amador CountyUnclassifiable/Attainment
Calaveras CountyUnclassifiable/Attainment
Southern Mountain Counties:
Mariposa CountyUnclassifiable/Attainment
Tuolumne CountyUnclassifiable/Attainment
Lake Tahoe Air Basin:
El Dorado County (remainder)Unclassifiable/Attainment
Placer County (remainder)Unclassifiable/Attainment
North Central Coast Air Basin:
Monterey CountyUnclassifiable/Attainment
San Benito CountyUnclassifiable/Attainment
Santa Cruz CountyUnclassifiable/Attainment
San Luis Obispo County:
San Luis Obispo CountyUnclassifiable/Attainment
Santa Barbara County:
Santa Barbara County (part)Unclassifiable/Attainment
Excluding San Miguel, Santa Rosa, Santa Cruz, and Santa Barbara Islands
Santa Barbara County (part)Unclassifiable/Attainment
San Miguel, Santa Rosa, Santa Cruz, and Santa Barbara Islands
Ventura County:
Ventura County (part)Unclassifiable/Attainment
Excluding Anacapa and San Nicolas Islands.
Ventura County (part)Unclassifiable/Attainment
Anacapa and San Nicolas Islands.
Great Basin Valleys Air Basin:
Alpine CountyUnclassifiable/Attainment
Inyo County (part)Unclassifiable/Attainment
That portion of Inyo County that Lies outside Hydrologic Unit Number 18090205.
Mono CountyUnclassifiable/Attainment
Coso Junction:
Inyo County (part)Unclassifiable/Attainment
That portion of Inyo County that lies inside Hydrologic Unit Number 18090205.
Eastern Kern County:
Kern County (part)Unclassifiable/Attainment
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205—the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; Then northwest Along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary.
Indian Wells Valley:
Kern County (part)Unclassifiable/Attainment
That portion of Kern County that lies inside Hydrologic Unit Number 18090205.
Western Mojave Desert and Antelope Valley:
Los Angeles County (part)Unclassifiable/Attainment
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
San Bernardino County (part)Unclassifiable/Attainment
That portion of San Bernardino County (with the exception of that portion in Hydrologic Unit Number 18090205) which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; And that portion of San Bernardino County which lies south and west of a line described as follows: latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Trona:
San Bernardino County (part)Unclassifiable/Attainment
That portion of San Bernardino County that lies inside Hydrologic Unit Number 18090205.
Coachella Valley:
Riverside County (part)Unclassifiable/Attainment
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then North along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line: And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, Elevation 45'05'; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814; then northwest along the ridge line to the Riverside-San Bernardino County line.
Far Eastern Riverside and San Bernardino Counties:
San Bernardino County (remainder)Unclassifiable/Attainment
Riverside County (remainder)Unclassifiable/Attainment
Imperial County (remainder)Unclassifiable Attainment
San Diego CountyUnclassifiable/Attainment

aIncludes Indian Country located in each county or area, except as otherwise specified.

1This date is 30 days after November 13, 2009, unless otherwise noted.

2This date is July 2, 2014, unless otherwise noted.

California—NO2 (1971 Annual Standard)

Designated areaDoes not meet primary standardsCannot be classified or better than national standards
North Coast Air BasinX
San Francisco Area Air BasinX
Lake County Air BasinX
North Central Coast Air Basin:
Monterey portionX
San Benito portionX
Santa Cruz portionX
South Central Coast Air Basin:
San Luis Obispo CountX
Santa Barbara AQMAX
Santa Barbara non-AQMAX
Ventura CountyX
Channel IslandsX
San Diego Air Basin:
West San Diego CountyX
East San Diego CountyX
South Coast Air BasinX
San Joaquin Valley Air Basin:
Fresno CountyX
Kern County (SJVAS portion)X
Kings CountyX
Madera CountyX
Merced CountyX
San Joaquin CountyX
Stanislaus CountyX
Tulare CountyX
Sacramento Valley Air Basin:
Sacramento CountyX
Solano County (Sacramento Valley Air Basin portion)X
Yolo CountyX
Butte CountyX
Colusa CountyX
Glenn CountyX
Shasta County (Sacramento Valley portion)X
Sutter CountyX
Tehama CountyX
Yuba CountyX
Great Basin Valleys Air BasinX
Northeast Plateau Air BasinX
Mountain Counties Air Basin:
AQMA portion of Placer Co. CountyX
Placer County excluding AQMA portion and Lake Tahoe portionX
Anador CountyX
Calaveras CountyX
El Dorado County, excluding Lake Tahoe Air Basin portionX
Mariposa CountyX
Nevada CountyX
Plumas CountyX
Sierra CountyX
Tuolumne CountyX
Southeast Desert Air Basin County:
Kern County (S.E. Desert portion) CountyX
Imperial CountyX
Los Angeles County (portion within S.E. Desert Air Basin)X
Riverside County (portion not within South Coast Air Basin or Coachella Valley planning area)X
San Bernardino County (portion within S.E. Desert AQMA)X
Riverside County (Coachella Valley planning area)X
San Bernardino, non-AQMAX
Tahoe Air BasinX

California—NO2 (2010 1-Hour Standard)

Designated area Designationa
Date1Type
Amador County APCD:
Amador CountyUnclassifiable/Attainment.
Antelope Valley AQMD:
Los Angeles County (part)Unclassifiable/Attainment.
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to T. 3 N and T. 2 N, San Bernardino Base and Meridian; then north along the range line common to R. 8 W and R. 9 W; then west along the township line common to T. 4 N and T. 3 N; then north along the range Line Common to R. 12 W and R. 13 W to the southeast corner of Section 12, T. 5 N, R. 13 W; then west along the south boundaries of Sections 12, 11, 10, 9, 8, 7, T. 5 N, R. 13 W to the boundary of the Angeles National Forest which is collinear with the range line common to R. 13 W and R. 14 W; then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to T. 7 N and T. 6 N (point is at the northwest corner of Section 4 in T. 6 N, R. 14 W); then west along the township line common to T. 7 N and T. 6 N; then north along the range line common to R. 15 W and R. 16 W to the southeast corner of Section 13, T. 7 N, R. 16 W; then along the south boundaries of Sections 13, 14, 15, 16, 17, 18, T. 7 N, R. 16 W; then north along the range line common to R. 16 W and R. 17 W to the north boundary of the Angeles National Forest (collinear with township line common to T. 8 N and T. 7 N) then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Bay Area AQMD:
Alameda CountyUnclassifiable/Attainment.
Contra Costa CountyUnclassifiable/Attainment.
Marin CountyUnclassifiable/Attainment.
Napa CountyUnclassifiable/Attainment.
San Francisco CountyUnclassifiable/Attainment.
San Mateo CountyUnclassifiable/Attainment.
Santa Clara CountyUnclassifiable/Attainment.
Solano County (part)Unclassifiable/Attainment.
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T. 6 N, R. 2.W, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, T. 6 N, R. 2 W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T. 5 N, R. 1 W, thence east along a line common to T. 5 N and T. 6 N to the northeast corner of Section 3, T. 5 N, R. 1 E, thence south along section lines to the southeast corner of Section 10, T. 3 N, R. 1 E, thence east along section lines to the south 1/4 corner of Section 8, T. 3 N, R. 2 E, thence east to the boundary between Solano and Sacramento Counties
Sonoma County (part)Unclassifiable/Attainment.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, Mount Diablo Meridian; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties
Butte County AQMD:
Butte CountyUnclassifiable/Attainment.
Calaveras County AQMD:
Calaveras CountyUnclassifiable/Attainment.
Colusa County AQMD:
Colusa CountyUnclassifiable/Attainment.
Eastern Kern APCD:
Kern County (part)Unclassifiable/Attainment.
That portion of Kern County east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W and R. 17 W, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of Section 3, T. 11 N, R. 17 W; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, T. 32 S, R. 30 E, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, T. 31 S, R. 30 E; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, T. 31 S, R. 31 E; then east to the southeast corner of Section 13, T. 31 S, R. 31 E; then north along the range line common to R. 31 E and R. 32 E, Mount Diablo Base and Meridian, to the northwest corner of Section 6, T. 29 S, R. 32 E; then east to the southwest corner of Section 31 T. 28 S, R. 32 E; then north along the range line common to R. 31 E and R. 32 E to the northwest corner of Section 6, T. 28 S, R. 32 E, then west to the southeast corner of Section 36, T. 27 S, R. 31 E, then north along the range line common to R. 31 E and R. 32 E to the Kern-Tulare County boundary
El Dorado County AQMD:
El Dorado CountyUnclassifiable/Attainment.
Feather River AQMD:
Sutter CountyUnclassifiable/Attainment.
Yuba CountyUnclassifiable/Attainment.
Glenn County APCD:
Glenn CountyUnclassifiable/Attainment.
Great Basin Unified APCD:
Alpine CountyUnclassifiable/Attainment.
Inyo CountyUnclassifiable/Attainment.
Mono CountyUnclassifiable/Attainment.
Imperial County APCD:
Imperial CountyUnclassifiable/Attainment.
Lake County AQMD:
Lake CountyUnclassifiable/Attainment.
Lassen County APCD:
Lassen CountyUnclassifiable/Attainment.
Mariposa County APCD:
Mariposa CountyUnclassifiable/Attainment.
Mendocino County AQMD:
Mendocino CountyUnclassifiable/Attainment.
Modoc County APCD:
Modoc CountyUnclassifiable/Attainment.
Mojave Desert AQMD:
Riverside County (part)Unclassifiable/Attainment.
That portion of Riverside County which lies east of a line described as follows: Beginning at the southwest corner of Section 32, T. 8 S, R. 20 E, San Bernardino Base and Meridian, on the Riverside-Imperial County Boundary; then northerly along section lines to the northwest corner of Section 5, T. 7 S, R. 20 E; then westerly along the township line to the southwest corner of Section 31, T. 6 S, R. 19 E; then northerly along the range line to the northwest corner of Section 6, T. 5 S, R. 19 E; then easterly along the township line to the southwest corner of Section 33, T. 4 S, R. 19 E; then northerly along section lines to the northwest corner of Section 4, T. 4 S, R. 19 E; then westerly along the township lines to the southwest corner of Section 32, T. 3 S, R. 19 E; then northerly along section lines to the northwest corner of Section 17, T. 3 S, R. 19 E; then westerly along the township line to the southwest corner of Section 7, T. 3 S, R. 19 E; then northerly along section lines to the northwest corner of Section 30, T. 2 S, R. 19 E; then westerly along the southerly line of Section 24, T. 2 S, R. 18 E, to the southwest corner thereof; then northerly along section lines to the northwest corner of Section 13, T. 2 S, R. 18 E; then westerly along section lines to the southwest corner of Section 10, T. 2 S, R. 18 E; then northerly along section lines to the Riverside-San Bernardino County boundary
San Bernardino County (part)Unclassifiable/Attainment.
That portion of San Bernardino County east and north of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to R. 3 E and R. 2 E, San Bernardino Base and Meridian; then west along the township line common to T. 3 N and T. 2 N to the San Bernardino-Los Angeles County boundary
Monterey Bay Unified APCD:
Monterey CountyUnclassifiable/Attainment.
San Benito CountyUnclassifiable/Attainment.
Santa Cruz CountyUnclassifiable/Attainment.
North Coast Unified AQMD:
Del Norte CountyUnclassifiable/Attainment.
Humboldt CountUnclassifiable/Attainment.
Trinity CountyUnclassifiable/Attainment.
Northern Sierra AQMD:
Nevada CountyUnclassifiable/Attainment.
Plumas CountyUnclassifiable/Attainment.
Sierra CountyUnclassifiable/Attainment.
Northern Sonoma County APCD:
Sonoma County (part)Unclassifiable/Attainment.
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, Mount Diablo Meridian; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
Placer County APCD:
Placer CountyUnclassifiable/Attainment.
Sacramento Metropolitan AQMD:
Sacramento County10/28/2013Attainment.
San Diego County APCD:
San Diego CountyUnclassifiable/Attainment.
San Joaquin Valley Unified APCD:
Fresno CountyUnclassifiable/Attainment.
Kern County (part)Unclassifiable/Attainment.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W and R. 17 W, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of Section 3, T. 11 N, R. 17 W; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, T. 32 S, R. 30 E, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, T. 31 S, R. 30 E; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, T. 31 S, R. 31 E; then east to the southeast corner of Section 13, T. 31 S, R. 31 E; then north along the range line common to R. 31 E and R. 32 E, Mount Diablo Base and Meridian, to the northwest corner of Section 6, T. 29 S, R. 32 E; then east to the southwest corner of Section 31, T. 28 S, R. 32 E; then north along the range line common to R. 31 E and R. 32 E to the northwest corner of Section 6, T. 28 S, R. 32 E, then west to the southeast corner of Section 36, T. 27 S, R. 31 E, then north along the range line common to R. 31 E and R. 32 E to the Kern-Tulare County boundary.
Kings CountyUnclassifiable/Attainment.
Madera CountyUnclassifiable/Attainment.
Merced CountyUnclassifiable/Attainment.
San Joaquin CountyUnclassifiable/Attainment.
Stanislaus CountyUnclassifiable/Attainment.
Tulare CountyUnclassifiable/Attainment.
San Luis Obispo County APCD:
San Luis Obispo CountyUnclassifiable/Attainment.
Santa Barbara County APCD:
Santa Barbara CountyUnclassifiable/Attainment.
Shasta County AQMD:
Shasta CountyUnclassifiable/Attainment.
Siskiyou County APCD:
Siskiyou CountyUnclassifiable/Attainment.
South Coast AQMD:
Los Angeles County (part)Unclassifiable/Attainment.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to T.3 N and T.2 N, San Bernardino Base and Meridian; then north along the range line common to R.8 W and R.9 W; then west along the township line common to T.4 N and T.3 N; then north along the range line common to R.12 W and R.13 W to the southeast corner of Section 12, T.5 N, R. 13 W; then west along the south boundaries of Sections 12, 11, 10, 9, 8, 7, T.5 N, R. 13 W to the boundary of the Angeles National Forest which is collinear with the range line common to R. 13 W and R. 14 W; then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to T.7 N and T. 6 N (point is at the northwest corner of Section 4 in T.6 N, R. 14 W); then west along the township line common to T.7 N and T.6 N; then north along the range line common to R. 15 W and R. 16 W to the southeast corner of Section 13, T.7 N, R. 16 W; then along the south boundaries of Sections 13, 14, 15, 16, 17, 18, T.7 N, R. 16 W; then north along the range line common to R.16 W and R. 17 W to the north boundary of the Angeles National Forest (collinear with township line common to T.8 N and T.7 N); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange CountyUnclassifiable/Attainment.
Riverside County (part)Unclassifiable/Attainment.
That portion of Riverside County which lies west of a line described as follows: Beginning at the southwest corner of Section 32, T. 8 S, R. 20 E, San Bernardino Base and Meridian, on the Riverside-Imperial County Boundary; then northerly along section lines to the northwest corner of Section 5, T. 7 S, R. 20 E; then westerly along the township line to the southwest corner of Section 31, T. 6 S, R. 19 E; then northerly along the range line to the northwest corner of Section 6, T. 5 S, R. 19 E; then easterly along the township line to the southwest corner of Section 33, T. 4 S, R. 19 E; then northerly along section lines to the northwest corner of Section 4, T. 4 S, R. 19 E; then westerly along the township lines to the southwest corner of Section 32, T. 3 S, R. 19 E; then northerly along section lines to the northwest corner of Section 17, T. 3 S, R. 19 E; then westerly along the township line to the southwest corner of Section 7, T. 3 S, R. 19 E; then northerly along section lines to the northwest corner of Section 30, T. 2 S, R. 19 E; then westerly along the southerly line of Section 24, T. 2 S, R. 18 E, to the southwest corner thereof; then northerly along section lines to the northwest corner of Section 13, T. 2 S, R. 18 E; then westerly along section lines to the southwest corner of Section 10, T. 2 S, R. 18 E; then northerly along section lines to the Riverside-San Bernardino County boundary.
San Bernardino County (part)Unclassifiable/Attainment.
That portion of San Bernardino County west and south of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to R. 3 E and R. 2 E; then west along the township line common to T. 3 N and T. 2 N to the San Bernardino-Los Angeles County boundary.
Tehama County APCD:
Tehama CountyUnclassifiable/Attainment.
Tuolumne County APCD:
Tuolumne CountyUnclassifiable/Attainment.
Ventura County APCD:
Ventura CountyUnclassifiable/Attainment.
Yolo-Solano AQMD:
Solano CountyUnclassifiable/Attainment.
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T. 6 N, R. 2 W, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, T. 6 N, R. 2 W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T. 5 N, R. 1 W, thence east along a line common to T. 5 N and T. 6 N to the northeast corner of Section 3, T. 5 N, R. 1 E, thence south along section lines to the southeast corner of Section 10, T. 3 N, R. 1 E, thence east along section lines to the south 1/4 corner of Section 8, T. 3 N, R. 2 E, thence east to the boundary between Solano and Sacramento Counties.
Yolo CountyUnclassifiable/Attainment.

aIncludes Indian Country located in each county or area, except as otherwise specified.

1This date is 90 days after October 31, 2011, unless otherwise noted.

California—1997 8-Hour Ozone NAAQS (Primary and Secondary)

Designated area DesignationaCategory/classification
Date1TypeDate1Type
Amador and Calaveras Cos., CA:
(Central Mountain Cos.)
Amador CountyNonattainment6/13/12Subpart 2/Moderate.
Calaveras CountyNonattainment6/13/12Subpart 2/Moderate.
Chico, CA:
Butte CountyNonattainment6/13/12Subpart 2/Marginal.
Kern County (Eastern Kern), CA
Kern County (part)Nonattainment6/13/12Subpart 2/Moderate.
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205—the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary
Imperial County, CA: Imperial CountyNonattainment3/14/08Subpart 2/Moderate.
Los Angeles—South Coast Air Basin, CA:dNonattainment(2)Subpart 2/Extreme.
Los Angeles County (part)Nonattainment(2)Subpart 2/Extreme.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange CountyNonattainment(2)Subpart 2/Extreme.
Riverside County (part)Nonattainment(2)Subpart 2/Extreme.
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line.
Pechanga ReservationcNonattainment(2)Subpart 2/Severe-17.
San Bernardino County (part)Nonattainment(2)Subpart 2/Extreme.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Morongo Band of Mission IndianseNonattainmentSubpart 2/Severe-17.
Los Angeles and San Bernardino Counties (Western Mojave Desert), CANonattainment6/7/2012Subpart 2/Severe-15.
Los Angeles County (part)Nonattainment6/7/2012Subpart 2/Severe-15.
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
San Bernardino County (part)Nonattainment6/7/2012Subpart 2/Severe-15.
That portion of San Bernardino County which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; And that portion of San Bernardino County which lies south and west of a line described as follows: latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Mariposa and Tuolumne Cos., CA:
(Southern Mountain Counties)
Mariposa CountyNonattainment6/13/12Subpart 2/Moderate.
Tuolumne CountyNonattainment6/13/12Subpart 2/Moderate.
Riverside Co. (Coachella Valley), CANonattainment(2)Subpart 2/Severe-15.
Riverside County (part)Nonattainment(2)Subpart 2/Severe-15.
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line. And that portion of Riverside County which lies to the west of a line described as follows:
That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, elevation 4504; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814; then northwest along the ridge line to the Riverside-San Bernardino County line.
Sacramento Metro, CANonattainment(2)Subpart 2/Severe-15.
El Dorado County (part)Nonattainment(2)Subpart 2/Severe-15.
All portions of the county, except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part)Nonattainment(2)Subpart 2/Severe-15.
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning.
Sacramento CountyNonattainment(2)Subpart 2/Severe-15.
Solano County (part)Nonattainment(2)Subpart 2/Severe-15.
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1/4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Sutter County (part)Nonattainment(2)Subpart 2/Severe-15.
Portion south of a line connecting the northern border of Yolo County to the SW tip of Yuba County and continuing along the southern Yuba County border to Placer County
Yolo CountyNonattainment(2)Subpart 2/Severe-15.
San Diego, CA
San Diego County (part)
That portion of San Diego County that excludes the areas listed below: La Posta Areas #1 and #2,b Cuyapaipe Area,b Manzanita Area,b Campo Areas #1 and #2bJuly 5, 2013Attainment
La Posta Areas #1 and #2,bUnclassifiable/Attainment
Cuyapaipe Area,bUnclassifiable/Attainment
Manzanita Area,bUnclassifiable/Attainment
Campo Areas #1 and #2bUnclassifiable/Attainment
San Francisco Bay Area, CANonattainmentSubpart 2/Marginal.
Alameda CountyNonattainmentSubpart 2/Marginal.
Contra Costa CountyNonattainmentSubpart 2/Marginal.
Marin CountyNonattainmentSubpart 2/Marginal.
Napa CountyNonattainmentSubpart 2/Marginal.
San Francisco CountyNonattainmentSubpart 2/Marginal.
San Mateo CountyNonattainmentSubpart 2/Marginal.
Santa Clara CountyNonattainmentSubpart 2/Marginal.
Solano County (part)NonattainmentSubpart 2/Marginal.
Portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1/4 section line to the east boundary of Section 36, T6N, R2W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part)NonattainmentSubpart 2/Marginal.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
San Joaquin Valley, CANonattainment(2)Subpart 2/Extreme.
Fresno CountyNonattainment(2)Subpart 2/Extreme.
Kern County (part)Nonattainment(2)Subpart 2/Extreme.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary.
Kings CountyNonattainment(2)Subpart 2/Extreme.
Madera CountyNonattainment(2)Subpart 2/Extreme.
Merced CountyNonattainment(2)Subpart 2/Extreme.
San Joaquin CountyNonattainment(2)Subpart 2/Extreme.
Stanislaus CountyNonattainment(2)Subpart 2/Extreme.
Tulare CountyNonattainment(2)Subpart 2/Extreme.
Sutter County (part), CA:
Sutter County (part)
(Sutter Buttes) That portion of the Sutter Buttes mountain range at or above 2,000 feet in elevationNonattainment6/13/12Subpart 2/Marginal.
Remainder of CountyUnclassifiable/Attainment
Ventura County, CA:
Ventura County (part)—That part of Ventura County excluding the Channel Islands of Anacapa and San Nicolas Islands.Nonattainment6/19/08Subpart 2/Serious.
Remainder of CountyUnclassifiable/Attainment
Nevada County (Western part), CA
Nevada County (part)
That portion of Nevada County, which lies west of a line, described as follows: beginning at the Nevada-Placer County boundary and running north along the western boundaries of Sections 24, 13, 12, 1, Township 17 North, Range 14 East, Mount Diablo Base and Meridian, and Sections 36, 25, 24, 13, 12, Township 18 North, Range 14 East to the Nevada-Sierra County boundaryNonattainment6/13/12Subpart 2/Moderate.
Santa Barbara-Santa Maria-Lompoc, CA:
Santa Barbara CountyUnclassifiable/Attainment
Mohave Desert Air Basin:
Riverside County (part) remainderUnclassifiable/Attainment
San Bernardino County (part) remainderUnclassifiable/Attainment
Great Basin Valleys Air BasinUnclassifiable/Attainment
Alpine County
Inyo County
Mono County
Lake County Air BasinUnclassifiable/Attainment
Lake County
Lake Tahoe Air BasinUnclassifiable/Attainment
El Dorado County (part)
Lake Tahoe Area: As described under 40 CFR 81.275.
Placer County (part)
Lake Tahoe Area: As described under 40 CFR 81.275.
Monterey Bay AreaUnclassifiable/Attainment
Monterey County
San Benito County
Santa Cruz County
Mountain Counties Air Basin (remainder of):
Nevada County (part) remainderUnclassifiable/Attainment
Plumas CountyUnclassifiable/Attainment
Sierra CountyUnclassifiable/Attainment
North Coast Air BasinUnclassifiable/Attainment
Del Norte County
Humboldt County
Mendocino County
Sonoma County (part) remainder
Trinity County
Northeast Plateau Air BasinUnclassifiable/Attainment
Lassen County
Modoc County
Siskiyou County
Sacramento Valley Air Basin (remainder of):
Colusa CountyUnclassifiable/Attainment
Glenn CountyUnclassifiable/Attainment
Shasta CountyUnclassifiable/Attainment
Tehama CountyUnclassifiable/Attainment
Yuba CountyUnclassifiable/Attainment
South Central Coast Air Basin:
(remainder of)
Channel IslandsUnclassifiable/Attainment
San Luis Obispo CountyUnclassifiable/Attainment

aIncludes Indian Country located in each county or area, except as otherwise specified.

bThe boundaries for these designated areas are based on coordinates of latitude and longitude derived from EPA Region 9's GIS database and are illustrated in a map entitled “Eastern San Diego County Attainment Areas for the 8-Hour Ozone NAAQS,” dated March 9, 2004, including an attached set of coordinates. The map and attached set of coordinates are available at EPA's Region 9 Air Division office. The designated areas roughly approximate the boundaries of the reservations for these tribes, but their inclusion in this table is intended for CAA planning purposes only and is not intended to be a federal determination of the exact boundaries of the reservations. Also, the specific listing of these tribes in this table does not confer, deny, or withdraw Federal recognition of any of the tribes so listed nor any of the tribes not listed.

cThe use of reservation boundaries for this designation is for purposes of CAA planning only and is not intended to be a federal determination of the exact boundaries of the reservations. Nor does the specific listing of the Tribes in this table confer, deny, or withdraw Federal recognition of any of the Tribes listed or not listed.

dExcludes Morongo Band of Mission Indians' Indian country in Riverside County.

eIncludes Indian country of the tribe listed in this table. Information pertaining to areas of Indian country in this table is intended for CAA planning purposes only and is not an EPA determination of Indian country status or any Indian country boundary. EPA lacks the authority to establish Indian country land status, and is making no determination of Indian country boundaries, in this table.

1This date is June 15, 2004, unless otherwise noted.

2This date is June 4, 2010.

California—2008 8-Hour Ozone NAAQS (Primary and secondary)

Designated areaDesignationClassification
Date1TypeDate1Type
Calaveras County, CA:2 Calaveras CountyNonattainmentMarginal.
Chico (Butte County), CA:2NonattainmentMarginal.
Butte County
Berry Creek Rancheria of Maidu Indians of California3
Enterprise Rancheria of Maidu Indians of California3
Mechoopda Indian Tribe of Chico Rancheria3
Mooretown Rancheria of Maidu Indians of California3
Imperial County, CA:2NonattainmentMarginal.
Imperial County
Quechan Tribe of the Fort Yuma Indian Reservation3
Torres Martinez Desert Cahuilla Indians3
Kern County (Eastern Kern), CA:2NonattainmentMarginal.
Kern County (part)
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205—the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary
Los Angeles-San Bernardino Counties (West Mojave Desert), CA:2NonattainmentSevere 15.
Los Angeles County (part)
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
San Bernardino County (part)
That portion of San Bernardino County which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; and that portion of San Bernardino County which lies south and west of a line described as follows: latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west
Twenty-Nine Palms Band of Mission Indians of California3
Los Angeles-South Coast Air Basin, CA2NonattainmentExtreme.
Los Angeles County (part)
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange County
Riverside County (part)
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the southern boundaries of Sections 25, 26, and 27, Township 7 South, Range 4 East, then North along the west boundaries of Sections 27, 22, 15, 10, and 3 Township 7 South, Range 4 East, then East along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line.
San Bernardino County (part)
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Cahuilla Band of Mission Indians of the Cahuilla Reservation3
Ramona Band of Cahuilla3
San Manuel Band of Mission Indians3
Soboba Band of Luiseno Indians3
Mariposa County, CA:2 Mariposa CountyNonattainmentMarginal.
Nevada County (Western part), CA:2NonattainmentMarginal.
Nevada County (part)
That portion of Nevada County, which lies west of a line, described as follows: Beginning at the Nevada-Placer County boundary and running north along the western boundaries of Sections 24, 13, 12, 1, Township 17 North, Range 14 East, Mount Diablo Base and Meridian, and Sections 36, 25, 24, 13, 12, Township 18 North, Range 14 East to the Nevada-Sierra County boundary.
Riverside County (Coachella Valley), CA:2NonattainmentSevere 15.
Riverside County (part)
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line. And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of hydrologic Unit Number 18100100 within Riverside County.
Agua Caliente Band of Cahuilla Indians of the Agua Caliente Indian Reservation3
Augustine Band of Cahuilla Indians3
Cabazon Band of Mission Indians3
Santa Rosa Band of Cahuilla Indians3
Torres Martinez Desert Cahuilla Indians3
Twenty-Nine Palms Band of Mission Indians of California3
Sacramento Metro, CA:2NonattainmentSevere 15.
El Dorado County (part)
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part)
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning.
Sacramento County
Solano County (part)
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1/4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Sutter County (part)
Portion south of a line connecting the northern border of Yolo County to the SW tip of Yuba County and continuing along the southern Yuba County border to Placer County.
Yolo County
Shingle Springs Band of Miwok Indians, Shingle Springs Rancheria (Verona Tract)3
United Auburn Indian Community of the Auburn Rancheria of California3
Yocha Dehe Wintun Nation3
San Diego County, CA:2NonattainmentMarginal.
San Diego County
Barona Group of Capitan Grande Band of Mission Indians of the Barona Reservation3
Campo Band of Diegueno Mission Indians of the Campo Indian Reservation3
Capitan Grande Band of Diegueno Mission Indians of California3
Ewiiaapaayp Band of Kumayaay Indians3
Iipay Nation of Santa Ysabel3
Inaja Band of Diegueno Mission Indians of the Inaja and Cosmit Reservation3
Jamul Indian Village of California3
La Jolla Band of Luiseno Indians3
La Posta Band of Diegueno Mission Indians of the La Posta Indian Reservation3
Los Coyotes Band of Cahuilla and Cupeno Indians3
Manzanita Band of Diegueno Mission Indians of the Manzanita Reservation3
Mesa Grande Band of Diegueno Mission Indians of the Mesa Grande Reservation3
Pala Band of Luiseno Mission Indians of the Pala Reservation3
Pauma Band of Luiseno Mission Indians of the Pauma and Yuima Reservation3
Rincon Band of Luiseno Mission Indians of the Rincon Reservation3
San Pasqual Band of Diegueno Mission Indians of California3
Sycuan Band of the Kumeyaay Nation3
Viejas (Baron Long) Group of Capitan Grande Band of Mission Indians3
San Francisco Bay Area, CA:2NonattainmentMarginal.
Alameda County
Contra Costa County
Marin County
Napa County
San Francisco County
San Mateo County
Santa Clara County
Solano County (part)
Portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1/4 section line to the east boundary of Section 36, T6N, R2W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part)
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence Running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
Federated Indians of Graton Rancheria3
Lytton Rancheria of California3
San Joaquin Valley, CA:2NonattainmentExtreme.
Fresno County
Kern County (part)
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary.
Kings County
Madera County
Merced County
San Joaquin County
Stanislaus County
Tulare County
Big Sandy Rancheria of Mono Indians of California3
Cold Springs Rancheria of Mono Indians of California3
Northfork Rancheria of Mono Indians of California3
Picayune Rancheria of Chukchansi Indians of California3
Santa Rosa Indian Community of the Santa Rosa Rancheria3
Table Mountain Rancheria of California3
Tule River Indian Tribe of the Tule River Reservation3
San Luis Obispo (Eastern San Luis Obispo), CA:2NonattainmentMarginal.
San Luis Obispo County (part)
That portion of San Luis Obispo County that lies east of a line described as follows: Beginning at the San Luis Obispo County/Santa Barbara County boundary and running north along 120 degrees 24 minutes longitude to the intersection with 35 degrees 27 minutes latitude; east along 35 degrees 27 minutes latitude to the intersection with 120 degrees 18 minutes longitude; then north along 120 degrees 18 minutes longitude to the San Luis Obispo County/Monterey County boundary.
Tuscan Buttes, CA:2NonattainmentMarginal.
Tehama County (part)
Those portions of the immediate Tuscan Buttes area at or above 1,800 feet in elevation.
Ventura County, CA:2NonattainmentSerious.
Ventura County (part)
That part of Ventura County excluding the Channel Islands of Anacapa and San Nicolas Islands.
Morongo Band of Mission Indians3NonattainmentSerious.
Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation3NonattainmentModerate.
Rest of State:4
Alpine, Inyo, and Mono Counties:Unclassifiable/Attainment
Alpine County
Inyo County
Mono County
Amador CountyUnclassifiable/Attainment
Channel Islands (Ventura County)Unclassifiable/Attainment
Ventura County (part) remainder
Colusa CountyUnclassifiable/Attainment
Del Norte, Humboldt, and Trinity Counties):Unclassifiable/Attainment
Del Norte County
Humboldt County
Trinity County
Nevada County (part) remainderUnclassifiable/Attainment
Glenn CountyUnclassifiable/Attainment
Kern County (part) remainderUnclassifiable/Attainment
Lake CountyUnclassifiable/Attainment
Lake Tahoe (El Dorado County Portion):Unclassifiable/Attainment
El Dorado County (part) remainder
Lake Tahoe (Placer County Portion):Unclassifiable/Attainment
Placer County (part) remainder
Lassen CountyUnclassifiable/Attainment
Mendocino CountyUnclassifiable/Attainment
Modoc CountyUnclassifiable/Attainment
Monterey CountyUnclassifiable/Attainment
Northeastern San Bernardino County and Eastern Riverside CountyUnclassifiable/Attainment
San Bernardino County (part) remainder
Riverside County (part) remainder
Sonoma County (part) remainderUnclassifiable/Attainment
Sutter County and Yuba CountyUnclassifiable/Attainment
Sutter County (part) remainder
Yuba County
Plumas and Sierra CountiesUnclassifiable/Attainment
San Benito CountyUnclassifiable/Attainment
Santa Barbara CountyUnclassifiable/Attainment
Santa Cruz CountyUnclassifiable/Attainment
Shasta CountyUnclassifiable/Attainment
Siskiyou CountyUnclassifiable/Attainment
Tehama County (part) remainderUnclassifiable/Attainment
Tuolumne CountyUnclassifiable/Attainment
San Luis Obispo County (part) remainderUnclassifiable/Attainment

1This date is July 20, 2012, unless otherwise noted.

2Excludes Indian country located in each area, unless otherwise noted.

3Includes Indian country of the tribe listed in this table located in the identified area. Information pertaining to areas of Indian country in this table is intended for CAA planning purposes only and is not an EPA determination of Indian country status or any Indian country boundary. EPA lacks the authority to establish Indian country land status, and is making no determination of Indian country boundaries, in this table.

4Includes any Indian country in each county or area, unless otherwise specified.

California—2008 Lead NAAQS

Designated areaDesignation for the 2008 NAAQSa
Date1Type
Los Angeles County—South Coast Air Basin, CA:
Los Angeles County (part)12/31/10Nonattainment.
That portion of Los Angeles County which lies south and west of line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then North along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with The Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Rest of StateUnclassifiable/Attainment.

aIncludes Indian Country located in each county or area, except as otherwise specified.

1December 31, 2011 unless otherwise noted.

[43 FR 8964, Mar. 3, 1978]

Editorial Note: For Federal Register citations affecting §81.305, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.fdsys.gov.



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