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8-Hour Ozone (1997) Nonattainment Areas - NAAQS Revoked

Data is current as of May 31, 2024
View Notes
The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).

EXTREME (June 2024)
Los Angeles-South Coast Air Basin, CA
Riverside County (Coachella Valley), CA
San Joaquin Valley, CA
SEVERE 17 (June 2021)
Morongo Band of Mission Indians, CA
SEVERE 15 (June 2019)
Houston-Galveston-Brazoria, TX
Los Angeles and San Bernardino Counties (Western Mojave Desert), CA
Sacramento Metro, CA
SERIOUS (June 2013)
Baltimore, MD
Dallas-Fort Worth, TX
Ventura County (part), CA
MODERATE (June 2010)
Amador and Calaveras Cos. (Central Mountain Cos.), CA
Boston-Lawrence-Worcester (E. Mass), MA
Buffalo-Niagara Falls, NY
Greater Connecticut, CT
Imperial County, CA
Inland Sheboygan County, WI
Jamestown, NY
Jefferson County, NY
Kern County (Eastern Kern), CA
Mariposa and Tuolumne Cos. (Southern Mountain Counties), CA
Nevada County (Western part), CA
New York-N. New Jersey-Long Island, NY-NJ-CT
Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE
Pittsburgh-Beaver Valley, PA
Poughkeepsie, NY
Providence (all of RI), RI
Shoreline Sheboygan County, WI
Springfield (W. Mass), MA
Washington, DC-MD-VA
MARGINAL (June 2007)
Albany-Schenectady-Troy, NY
Chico, CA
Denver-Boulder-Greeley-Ft. Collins-Loveland, CO
Essex County (Whiteface Mtn.), NY
Rochester, NY
San Francisco Bay Area, CA
Sutter County (part) (Sutter Buttes), CA


Details about the designations and classifications of previous 1-hour ozone nonattainment and maintenance areas can be found here.

On June 8, 2007, the United States Court of Appeals vacated the Subpart 1 portion of the Phase 1 Rule (Court Order) (PDF). On May 14, 2012, the Former Subpart 1 nonattainment areas were classified under Subpart 2 (77 FR 28424 ) (PDF), effective June 13, 2012.

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