§ 81.12 National Capital Interstate Air Quality Control Region (District of Columbia, Maryland, and Virginia).

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Title 40—Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS > PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES > Subpart B—Designation of Air Quality Control Regions

This text was captured on Sep 22, 2026. It is a snapshot, not a live feed, so check the official code before relying on it.

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The National Capital Interstate Air Quality Control Region (District of Columbia, Maryland, and Virginia) consists of the territorial area encompassed by the boundaries of the following jurisdictions (including the territorial area of all municipalities (as defined in section 302(f) of the Clean Air Act, 42 U.S.C. 1857h(f)) geographically located within the outermost boundaries of the area so delimited);

District of Columbia

In the State of Maryland: Montgomery County; Prince Georges County.

In the State of Virginia: Arlington County; Fairfax County; Loudoun County; Prince William County.

(As so delimited, the Virginia portion of the region will include the city of Alexandria, the city of Fairfax, and the city of Falls Church.)

This is a copy of a public record, reproduced as it was published. It is not legal advice, and it may not be the version a court would rely on. Check the official source before you cite it.

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§ 81.12 National Capital Interstate Air Quality Control Region (District of Columbia, Maryland, and Virginia). · 40 CFR § 81.12 | Frix