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Electronic Code of Federal Regulations

e-CFR Data is current as of September 15, 2014

Title 40Chapter ISubchapter CPart 51Subpart Z → §51.1005


Title 40: Protection of Environment
PART 51—REQUIREMENTS FOR PREPARATION, ADOPTION, AND SUBMITTAL OF IMPLEMENTATION PLANS
Subpart Z—Provisions for Implementation of PM2.5 National Ambient Air Quality Standards


§51.1005   One-year extensions of the attainment date.

(a) Pursuant to section 172(a)(2)(C)(ii) of the Act, a State with an area that fails to attain the PM2.5 NAAQS by its attainment date may apply for an initial 1-year attainment date extension if the State has complied with all requirements and commitments pertaining to the area in the applicable implementation plan, and:

(1) For an area that violates the annual PM2.5 NAAQS as of its attainment date, the annual average concentration for the most recent year at each monitor is 15.0 µg/m3 or less (calculated according to the data analysis requirements in 40 CFR part 50, appendix N).

(2) For an area that violates the 24-hour PM2.5 NAAQS as of its attainment date, the 98th percentile concentration for the most recent year at each monitor is 65 µg/m3 or less (calculated according to the data analysis requirements in 40 CFR part 50, appendix N).

(b) An area that fails to attain the PM2.5 NAAQS after receiving a 1-year attainment date extension may apply for a second 1-year attainment date extension pursuant to section 172(a)(2)(C)(ii) if the State has complied with all requirements and commitments pertaining to the area in the applicable implementation plan, and:

(1) For an area that violates the annual PM2.5 NAAQS as of its attainment date, the two-year average of annual average concentrations at each monitor, based on the first extension year and the previous year, is 15.0 µg/m3 or less (calculated according to the data analysis requirements in 40 CFR part 50, appendix N).

(2) For an area that violates the 24-hour PM2.5 NAAQS as of its attainment date, the two-year average of annual 98th percentile concentrations at each monitor, based on the first extension year and the previous year, is 65 µg/m3 or less (calculated according to the data analysis requirements in 40 CFR part 50, appendix N).



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