1-Hour Ozone (1979) Maintenance Areas (Redesignated from Nonattainment) - NAAQS Revoked
Data is current as of November 30, 2025
| SEVERE |
| Atlanta, GA |
| |
| SERIOUS |
| East Kern County, CA |
| Phoenix, AZ |
| San Diego, CA |
| Santa Barbara-Santa Maria-Lompoc, CA |
| St. Louis, MO-IL |
| |
| MODERATE |
| Charleston, WV |
| Charlotte-Gastonia, NC |
| Cincinnati-Hamilton, OH-KY |
| Cleveland-Akron-Lorain, OH |
| Dayton-Springfield, OH |
| Detroit-Ann Arbor, MI |
| Grand Rapids, MI |
| Greensboro-Winston-Salem-High Point, NC |
| Huntington-Ashland, WV-KY |
| Kewaunee County, WI |
| Louisville, KY-IN |
| Manitowoc County, WI |
| Miami-Fort Lauderdale-W. Palm Beach, FL |
| Monterey Bay, CA |
| Muskegon, MI |
| Nashville, TN |
| Parkersburg-Marietta, WV |
| Pittsburgh-Beaver Valley, PA |
| Raleigh-Durham, NC |
| Reading, PA |
| Richmond, VA |
| Salt Lake City, UT |
| Sheboygan, WI |
| Toledo, OH |
| |
| MARGINAL |
| Birmingham, AL |
| Canton, OH |
| Cherokee County, SC |
| Columbus, OH |
| Evansville, IN |
| Greenbrier, WV |
| Hancock County and Waldo County, ME |
| Indianapolis, IN |
| Jersey County, IL |
| Kent County and Queen Anne's County, MD |
| Knoxville, TN |
| Lake Charles, LA |
| Lexington-Fayette, KY |
| Memphis, TN |
| Norfolk-Virginia Beach-Newport News (Hampton Roads), VA |
| Owensboro, KY |
| Paducah, KY |
| Pointe Coupee Parish, LA |
| Portland-Vancouver AQMA, OR-WA |
| Seattle-Tacoma, WA |
| South Bend-Elkhart, IN |
| Tampa-St. Petersburg-Clearwater, FL |
| Walworth County, WI |
| Youngstown-Warren-Sharon, OH-PA (OH portion) |
| Door County, WI |
| Edmonson County, KY |
| |
| OTHER |
| Kansas City, MO-KS |
| |
| SECTION 185A |
| Clinton County, OH |
| Denver-Boulder, CO |
| Flint, MI |
| Jacksonville, FL |
| Lafayette, LA |
| New Orleans, LA |
| Preble County, OH |
| Steubenville, OH |
| |
| INCOMPLETE DATA |
| Allegan County, MI |
| Beauregard Parish, LA |
| Columbiana County, OH |
| Grant Parish, LA |
| Lafourche Parish, LA |
| Saginaw-Bay City-Midland, MI |
| St. James Parish, LA |
| St. Mary Parish, LA |
| Victoria, TX |
These areas are designated attainment . The Kansas City, MO-KS area has a sub-marginal classification. The former 1-hour ozone designations and classifications as of June 15, 2004, are being retained in subpart C of Part 81 for purposes of the anti backsliding provisions of 40 CFR 51.905. 40 CFR 51.905(c) references subpart C of part 81 for the areas affected by the anti-backsliding regulation.
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