Carbon Monoxide (1971) Maintenance Areas (Redesignated from Nonattainment)
Data is current as of November 30, 2025
| SERIOUS |
| Anchorage, AK |
| Denver-Boulder, CO |
| Fairbanks, AK |
| Las Vegas, NV |
| Los Angeles-South Coast Air Basin, CA |
| Phoenix, AZ |
| Spokane, WA |
| |
| MODERATE > 12.7PPM |
| Fresno, CA |
| New York-N. New Jersey-Long Island, NY-NJ-CT |
| Provo, UT |
| Seattle-Tacoma, WA |
| |
| MODERATE <= 12.7PPM |
| Albuquerque, NM |
| Baltimore, MD |
| Boston, MA |
| Chico, CA |
| Cleveland, OH |
| Colorado Springs, CO |
| Duluth, MN |
| El Paso, TX |
| Fort Collins, CO |
| Grants Pass, OR |
| Hartford-New Britain-Middletown, CT |
| Klamath Falls, OR |
| Lake Tahoe South Shore, CA |
| Longmont, CO |
| Medford, OR |
| Memphis, TN |
| Minneapolis-St. Paul, MN |
| Missoula, MT |
| Modesto, CA |
| Ogden, UT |
| Philadelphia-Camden County, PA-NJ |
| Portland, OR |
| Raleigh-Durham, NC |
| Reno, NV |
| Sacramento, CA |
| San Diego, CA |
| San Francisco-Oakland-San Jose, CA |
| Stockton, CA |
| Syracuse, NY |
| Vancouver, WA |
| Washington, DC-MD-VA |
| Winston-Salem, NC |
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