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Displaying title 40, up to date as of 8/06/2026. Title 40 was last amended 8/06/2026.
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Subpart E—Identification of Interstate Transport Regions

Source:

87 FR 7746, Feb. 10, 2022, unless otherwise noted.

§ 81.455 Scope.

This subpart identifies interstate transport regions established for national ambient air quality standards pursuant to section 184 or section 176A of the Clean Air Act.

§ 81.457 Ozone Transport Region.

Except as provided in paragraph (a), the Ozone Transport Region is comprised of the areas identified by Congress under 42 U.S.C. 7511c(a).

(a) Ozone Transport Region boundary. As of March 14, 2022, the boundary for the Ozone Transport Region consists of the entire States of Connecticut, Delaware, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and Vermont; portions of Maine identified in this section under Table 1; and the Consolidated Metropolitan Statistical Area that includes the District of Columbia and the following counties and cities in Virginia: Arlington County, Fairfax County, Loudoun County, Prince William County, Strafford County, Alexandria City, Fairfax City, Falls Church City, Manassas City, and Manassas Park City.

Table 1 to Paragraph (a)—Maine Towns and Cities in the Ozone Transport Region

Maine towns and cities in the ozone transport region
Androscoggin County (only the following town): Durham.
Cumberland County (only the following towns and cities): Brunswick, Cape Elizabeth, Casco, Cumberland, Falmouth, Freeport, Frye Island, Gorham, Gray, Harpswell, Long Island, New Gloucester, North Yarmouth, Portland, Pownal, Raymond, Scarborough, South Portland, Standish, Westbrook, Windham, and Yarmouth.
Hancock County (only the following towns and cities): Bar Harbor, Blue Hill, Brooklin, Brooksville, Cranberry Isles, Deer Isle, Frenchboro, Gouldsboro, Hancock, Lamoine, Mount Desert, Sedwick, Sorrento, Southwest Harbor, Stonington, Sullivan, Surry, Swans Island, Tremont, Trenton, and Winter Harbor.
Knox County (only the following towns and cities): Camden, Criehaven, Cushing, Friendship, Isle au Haut, Matinicus Isle, Muscle Ridge Shoals, North Haven, Owls Head, Rockland, Rockport, St. George, South Thomaston, Thomaston, Vinalhaven, and Warren.
Lincoln County (only the following towns and cities): Alna, Boothbay, Boothbay Harbor, Breman, Bristol, Damariscotta, Dresden, Edgecomb, Monhegan, Newcastle, Nobleboro, South Bristol, Southport, Waldoboro, Westport, and Wiscasset.
Sagadahoc County (all towns and cities).
Waldo County (only the following town): Islesboro.
York County (only the following towns and cities): Alfred, Arundel, Berwick, Biddeford, Buxton, Dayton, Eliot, Hollis, Kennebunk, Kennebunkport, Kittery, Limington, Lyman, North Berwick, Ogunquit, Old Orchard Beach, Saco, Sanford, South Berwick, Wells, and York.

(b) Applicability. As of March 14, 2022, the provisions of 42 U.S.C. 7511c will no longer be applicable in the following areas of Maine: The State of Maine, with the exception of the towns and cities listed in this section under table 1 to paragraph (a).