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Carbon Monoxide (1971) Maintenance Area (Redesignated from Nonattainment) State/Area/County Report
Carbon Monoxide (1971) Maintenance Area (Redesignated from Nonattainment) State/Area/County Report
Data is current as of November 30, 2024| ALASKA (Region X) | |
| Anchorage, AK (Serious - Maintenance) | |
| Anchorage Municipality (P) | |
| Portion of Anchorage urban area | |
| Fairbanks, AK (Serious - Maintenance) | |
| Fairbanks North Star Borough (P) | |
| Portion of Fairbanks urban area | |
| ARIZONA (Region IX) | |
| Phoenix, AZ (Serious - Maintenance) | |
| Maricopa County (P) | |
| Tucson, AZ (Not Classified - Maintenance) | |
| Pima County (P) | |
| Portion of Tucson urban area | |
| CALIFORNIA (Region IX) | |
| Bakersfield, CA (Not Classified - Maintenance) | |
| Kern County (P) | |
| Chico, CA (Moderate <= 12.7ppm - Maintenance) | |
| Butte County (P) | |
| Fresno, CA (Moderate > 12.7ppm - Maintenance) | |
| Fresno County (P) | |
| Fresno Urbanized Area (11/20/85, 50 FR 47735) | |
| Lake Tahoe North Shore, CA (Not Classified - Maintenance) | |
| Placer County (P) | |
| Lake Tahoe South Shore, CA (Moderate <= 12.7ppm - Maintenance) | |
| El Dorado County (P) | |
| Los Angeles-South Coast Air Basin, CA (Serious - Maintenance) | |
| Los Angeles County (P) | |
| Orange County | |
| Riverside County (P) | |
| San Bernardino County (P) | |
| Modesto, CA (Moderate <= 12.7ppm - Maintenance) | |
| Stanislaus County (P) | |
| Sacramento, CA (Moderate <= 12.7ppm - Maintenance) | |
| Placer County (P) | |
| Sacramento County (P) | |
| Yolo County (P) | |
| San Diego, CA (Moderate <= 12.7ppm - Maintenance) | |
| San Diego County (P) | |
| San Francisco-Oakland-San Jose, CA (Moderate <= 12.7ppm - Maintenance) | |
| Alameda County (P) | |
| Contra Costa County (P) | |
| Marin County (P) | |
| Napa County (P) | |
| San Francisco County | |
| San Mateo County (P) | |
| Santa Clara County (P) | |
| Solano County (P) | |
| Sonoma County (P) | |
| Stockton, CA (Moderate <= 12.7ppm - Maintenance) | |
| San Joaquin County (P) | |
| COLORADO (Region VIII) | |
| Colorado Springs, CO (Moderate <= 12.7ppm - Maintenance) | |
| El Paso County (P) | |
| Teller County (P) | |
| Denver-Boulder, CO (Serious - Maintenance) | |
| Adams County (P) | |
| Denver Metro Area | |
| Arapahoe County (P) | |
| Denver Metro Area | |
| Boulder County (P) | |
| Denver Metro Area | |
| Broomfield County | |
| Denver County | |
| Douglas County (P) | |
| Denver Metro Area | |
| Jefferson County (P) | |
| Denver Metro Area | |
| Fort Collins, CO (Moderate <= 12.7ppm - Maintenance) | |
| Larimer County (P) | |
| Greeley, CO (Not Classified - Maintenance) | |
| Weld County (P) | |
| Longmont, CO (Moderate <= 12.7ppm - Maintenance) | |
| Boulder County (P) | |
| Portion of Longmont | |
| Weld County (P) | |
| Portion of Longmont | |
| CONNECTICUT (Region I) | |
| Hartford-New Britain-Middletown, CT (Moderate <= 12.7ppm - Maintenance) | |
| Hartford County (P) | |
| Litchfield County (P) | |
| Plymouth Town | |
| Middlesex County (P) | |
| Tolland County (P) | |
| New Haven-Meriden-Waterbury, CT (Not Classified - Maintenance) | |
| Fairfield County (P) | |
| Shelton City | |
| Litchfield County (P) | |
| Bethlehem Town, Thomaston Town, Watertown, Woodbury Town. | |
| New Haven County | |
| New York-N. New Jersey-Long Island, NY-NJ-CT (Moderate > 12.7ppm - Maintenance) | |
| Fairfield County (P) | |
| All cities and townships except Shelton city | |
| Litchfield County (P) | |
| Bridgewater town, New Milford town | |
| DISTRICT OF COLUMBIA (Region III) | |
| Washington, DC-MD-VA (Moderate <= 12.7ppm - Maintenance) | |
| District of Columbia | |
| IDAHO (Region X) | |
| Boise-Northern Ada County, ID (Not Classified - Maintenance) | |
| Ada County (P) | |
| Northern half of Ada Co | |
| INDIANA (Region V) | |
| East Chicago, IN (Not Classified - Maintenance) | |
| Lake County (P) | |
| Indianapolis, IN (Not Classified - Maintenance) | |
| Marion County (P) | |
| MARYLAND (Region III) | |
| Baltimore, MD (Moderate <= 12.7ppm - Maintenance) | |
| Baltimore city (P) | |
| Washington, DC-MD-VA (Moderate <= 12.7ppm - Maintenance) | |
| Montgomery County (P) | |
| Election Districts 4, 7, 13 | |
| Prince George's County (P) | |
| Election Districts 2, 6, 12, 16, 17, 18 | |
| MASSACHUSETTS (Region I) | |
| Boston, MA (Moderate <= 12.7ppm - Maintenance) | |
| Middlesex County (P) | |
| Cities of: Cambridge, Everett, Malden, Medford, and Somerville. | |
| Norfolk County (P) | |
| Quincy CIty | |
| Suffolk County (P) | |
| Cities of: Boston, Chelsea, and Revere | |
| Lowell, MA (Not Classified - Maintenance) | |
| Middlesex County (P) | |
| Lowell City | |
| Springfield, MA (Not Classified - Maintenance) | |
| Hampden County (P) | |
| Springfield City | |
| Waltham, MA (Not Classified - Maintenance) | |
| Middlesex County (P) | |
| Waltham City | |
| Worcester, MA (Not Classified - Maintenance) | |
| Worcester County (P) | |
| City of Worcester | |
| MICHIGAN (Region V) | |
| Detroit, MI (Not Classified - Maintenance) | |
| Macomb County (P) | |
| A portion of Detroit | |
| Oakland County (P) | |
| A portion of Detroit | |
| Wayne County (P) | |
| A portion of Detroit | |
| MINNESOTA (Region V) | |
| Duluth, MN (Moderate <= 12.7ppm - Maintenance) | |
| St. Louis County (P) | |
| City of Duluth | |
| Minneapolis-St. Paul, MN (Moderate <= 12.7ppm - Maintenance) | |
| Anoka County | |
| Carver County (P) | |
| Dakota County (P) | |
| Hennepin County | |
| Ramsey County | |
| Scott County (P) | |
| Washington County (P) | |
| All cities and townships except Denmark Township. | |
| Wright County (P) | |
| MISSOURI (Region VII) | |
| St. Louis, MO (Not Classified - Maintenance) | |
| St. Louis County (P) | |
| The area encompassed by the I-270 and the Mississippi River. | |
| St. Louis city | |
| MONTANA (Region VIII) | |
| Billings, MT (Not Classified - Maintenance) | |
| Yellowstone County (P) | |
| Certain ranges and townships | |
| Great Falls, MT (Not Classified - Maintenance) | |
| Cascade County (P) | |
| Missoula, MT (Moderate <= 12.7ppm - Maintenance) | |
| Missoula County (P) | |
| NEVADA (Region IX) | |
| Lake Tahoe, NV (Not Classified - Maintenance) | |
| Carson City (P) | |
| Hydrographic Area 90 | |
| Douglas County (P) | |
| Hydrographic Area 90 | |
| Washoe County (P) | |
| Hydrographic Area 90 | |
| Las Vegas, NV (Serious - Maintenance) | |
| Clark County (P) | |
| Las Vegas Valley Hydrographic Area 212 | |
| Reno, NV (Moderate <= 12.7ppm - Maintenance) | |
| Washoe County (P) | |
| Truckee Meadows Hydrographic Area 87 | |
| NEW HAMPSHIRE (Region I) | |
| Manchester, NH (Not Classified - Maintenance) | |
| Hillsborough County (P) | |
| City of Manchester | |
| Nashua, NH (Not Classified - Maintenance) | |
| Hillsborough County (P) | |
| City of Nashua | |
| NEW JERSEY (Region II) | |
| Atlantic City, NJ (Not Classified - Maintenance) | |
| Atlantic County (P) | |
| The City of Atlantic City | |
| Burlington, NJ (Not Classified - Maintenance) | |
| Burlington County (P) | |
| City of Burlington | |
| Freehold, NJ (Not Classified - Maintenance) | |
| Monmouth County (P) | |
| Borough of Freehold | |
| Morristown, NJ (Not Classified - Maintenance) | |
| Morris County (P) | |
| City of Morristown | |
| New York-N. New Jersey-Long Island, NY-NJ-CT (Moderate > 12.7ppm - Maintenance) | |
| Bergen County | |
| Essex County | |
| Hudson County | |
| Passaic County (P) | |
| City of Clifton, City of Patterson, City of Passaic | |
| Union County | |
| Penns Grove, NJ (Not Classified - Maintenance) | |
| Salem County (P) | |
| Perth Amboy, NJ (Not Classified - Maintenance) | |
| Middlesex County (P) | |
| City of Perth Amboy | |
| Philadelphia-Camden County, PA-NJ (Moderate <= 12.7ppm - Maintenance) | |
| Camden County | |
| Somerville, NJ (Not Classified - Maintenance) | |
| Somerset County (P) | |
| Borough of Somerville | |
| Toms River, NJ (Not Classified - Maintenance) | |
| Ocean County (P) | |
| City of Toms River | |
| Trenton, NJ (Not Classified - Maintenance) | |
| Mercer County (P) | |
| City of Trenton | |
| NEW MEXICO (Region VI) | |
| Albuquerque, NM (Moderate <= 12.7ppm - Maintenance) | |
| Bernalillo County | |
| NEW YORK (Region II) | |
| New York-N. New Jersey-Long Island, NY-NJ-CT (Moderate > 12.7ppm - Maintenance) | |
| Bronx County | |
| Kings County | |
| Nassau County | |
| New York County | |
| Queens County | |
| Richmond County | |
| Westchester County | |
| Syracuse, NY (Moderate <= 12.7ppm - Maintenance) | |
| Onondaga County | |
| NORTH CAROLINA (Region IV) | |
| Charlotte, NC (Not Classified - Maintenance) | |
| Mecklenburg County | |
| Raleigh-Durham, NC (Moderate <= 12.7ppm - Maintenance) | |
| Durham County | |
| Wake County | |
| Winston-Salem, NC (Moderate <= 12.7ppm - Maintenance) | |
| Forsyth County | |
| OHIO (Region V) | |
| Cleveland, OH (Moderate <= 12.7ppm - Maintenance) | |
| Cuyahoga County | |
| OREGON (Region X) | |
| Eugene-Springfield, OR (Not Classified - Maintenance) | |
| Lane County (P) | |
| Air Quality Maintenance Area | |
| Grants Pass, OR (Moderate <= 12.7ppm - Maintenance) | |
| Josephine County (P) | |
| Central Business District | |
| Klamath Falls, OR (Moderate <= 12.7ppm - Maintenance) | |
| Klamath County (P) | |
| Urban Growth Boundary | |
| Medford, OR (Moderate <= 12.7ppm - Maintenance) | |
| Jackson County (P) | |
| Medford-Ashland Urban Growth Boundary | |
| Portland, OR (Moderate <= 12.7ppm - Maintenance) | |
| Clackamas County (P) | |
| Portland Metro Service District Boundary | |
| Multnomah County (P) | |
| Portland Metro Service District Boundary | |
| Washington County (P) | |
| Portland Metro Service District Boundary | |
| Salem, OR (Not Classified - Maintenance) | |
| Marion County (P) | |
| City of Salem | |
| Polk County (P) | |
| City of Salem | |
| PENNSYLVANIA (Region III) | |
| Philadelphia-Camden County, PA-NJ (Moderate <= 12.7ppm - Maintenance) | |
| Philadelphia County (P) | |
| Pittsburgh, PA (Not Classified - Maintenance) | |
| Allegheny County (P) | |
| TENNESSEE (Region IV) | |
| Memphis, TN (Moderate <= 12.7ppm - Maintenance) | |
| Shelby County | |
| TEXAS (Region VI) | |
| El Paso, TX (Moderate <= 12.7ppm - Maintenance) | |
| El Paso County (P) | |
| Portion of the City Limits of El Paso | |
| UTAH (Region VIII) | |
| Ogden, UT (Moderate <= 12.7ppm - Maintenance) | |
| Weber County (P) | |
| City of Ogden | |
| Provo, UT (Moderate > 12.7ppm - Maintenance) | |
| Utah County (P) | |
| City of Provo | |
| Salt Lake City, UT (Not Classified - Maintenance) | |
| Salt Lake County (P) | |
| Salt Lake City | |
| VIRGINIA (Region III) | |
| Washington, DC-MD-VA (Moderate <= 12.7ppm - Maintenance) | |
| Alexandria city | |
| Arlington County | |
| WASHINGTON (Region X) | |
| Seattle-Tacoma, WA (Moderate > 12.7ppm - Maintenance) | |
| King County (P) | |
| Pierce County (P) | |
| Snohomish County (P) | |
| Spokane, WA (Serious - Maintenance) | |
| Spokane County (P) | |
| Vancouver, WA (Moderate <= 12.7ppm - Maintenance) | |
| Clark County (P) | |
| Yakima, WA (Not Classified - Maintenance) | |
| Yakima County (P) | |
| Portion of the Central Business District | |
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