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Carbon Monoxide (1971) Maintenance Area (Redesignated from Nonattainment) Area/State/County Report

Data is current as of February 29, 2024


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


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