8-Hour Ozone (1997) Nonattainment Areas - NAAQS Revoked
Data is current as of January 31, 2025
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The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015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 |
Notes:
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.
Go Top