8-Hour Ozone (2008) Nonattainment Areas
Data is current as of November 30, 2025
| EXTREME |
| Los Angeles-South Coast Air Basin, CA |
| Riverside County (Coachella Valley), CA |
| San Joaquin Valley, CA |
| |
| SEVERE 15 |
| Dallas-Fort Worth, TX |
| Denver-Boulder-Greeley-Ft. Collins-Loveland, CO |
| Houston-Galveston-Brazoria, TX |
| Kern County (Eastern Kern), CA |
| Los Angeles-San Bernardino Counties (West Mojave Desert), CA |
| Morongo Band of Mission Indians, CA |
| New York-N. New Jersey-Long Island, NY-NJ-CT |
| Sacramento Metro, CA |
| San Diego County, CA |
| |
| SERIOUS |
| Greater Connecticut, CT |
| Nevada County (Western part), CA |
| Ventura County, CA |
| |
| MODERATE |
| Baltimore, MD |
| Imperial County, CA |
| Mariposa County, CA |
| Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, CA |
| Phoenix-Mesa, AZ |
| |
| MARGINAL |
| Allentown-Bethlehem-Easton, PA |
| Calaveras County, CA |
| Chico (Butte County), CA |
| Dukes County, MA |
| Jamestown, NY |
| Lancaster, PA |
| Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE |
| Pittsburgh-Beaver Valley, PA |
| Reading, PA |
| San Francisco Bay Area, CA |
| San Luis Obispo (Eastern San Luis Obispo), CA |
| Seaford, DE |
| Tuscan Buttes, CA |
| Upper Green River Basin Area, WY |
Go Top
