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Current Nonattainment Counties for All Criteria Pollutants

Data is current as of February 29, 2024

The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.
The asterisk (*) indicates only a portion of the county is included in the designated nonattainment area (NA).


Download National Dataset of all designated areas (currently nonattainment, maintenance, revoked):
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Listed by State, County, NAAQS      * Part County NA     NA Area Name (Classification, if applicable)


ALASKA
Fairbanks North Star Borough
PM-2.5 (2006) * Fairbanks, AK - (Serious)
ARIZONA
Cochise County
PM-10 (1987) * Cochise County; Paul Spur/Douglas planning area, AZ - (Moderate)
Gila County
Lead (2008) * Hayden, AZ
PM-10 (1987) * Hayden, AZ - (Moderate)
PM-10 (1987) * Miami, AZ - (Moderate)
Sulfur Dioxide (2010) * Hayden, AZ
Sulfur Dioxide (2010) * Miami, AZ
8-Hour Ozone (2015) * Phoenix-Mesa, AZ - (Moderate)
Maricopa County
PM-10 (1987) * Maricopa and Pinal Counties; Phoenix planning area, AZ - (Serious)
8-Hour Ozone (2008) * Phoenix-Mesa, AZ - (Moderate)
8-Hour Ozone (2015) * Phoenix-Mesa, AZ - (Moderate)
Pima County
PM-10 (1987) * Pima County; Rillito planning area, AZ - (Moderate)
Pinal County
Lead (2008) * Hayden, AZ
PM-10 (1987) * Hayden, AZ - (Moderate)
PM-10 (1987) * Maricopa and Pinal Counties; Phoenix planning area, AZ - (Serious)
PM-10 (1987) * Miami, AZ - (Moderate)
PM-10 (1987) * Pinal County (part); West Pinal, AZ - (Serious)
PM-2.5 (2006) * West Central Pinal, AZ - (Moderate)
Sulfur Dioxide (1971) * Hayden (Pinal County), AZ
Sulfur Dioxide (2010) * Hayden, AZ
8-Hour Ozone (2008) * Phoenix-Mesa, AZ - (Moderate)
8-Hour Ozone (2015) * Phoenix-Mesa, AZ - (Moderate)
Santa Cruz County
PM-10 (1987) * Santa Cruz County; Nogales planning area, AZ - (Moderate)
Yuma County
PM-10 (1987) * Yuma, AZ - (Moderate)
8-Hour Ozone (2015) * Yuma, AZ - (Marginal)
CALIFORNIA
Alameda County
PM-2.5 (2006) San Francisco Bay Area, CA - (Moderate)
8-Hour Ozone (2008) San Francisco Bay Area, CA - (Marginal)
8-Hour Ozone (2015) San Francisco Bay Area, CA - (Marginal)
Amador County
8-Hour Ozone (2015) Amador County, CA - (Marginal)
Butte County
8-Hour Ozone (2008) Chico (Butte County), CA - (Marginal)
8-Hour Ozone (2015) Butte County, CA - (Marginal)
Calaveras County
8-Hour Ozone (2008) Calaveras County, CA - (Marginal)
8-Hour Ozone (2015) Calaveras County, CA - (Marginal)
Contra Costa County
PM-2.5 (2006) San Francisco Bay Area, CA - (Moderate)
8-Hour Ozone (2008) San Francisco Bay Area, CA - (Marginal)
8-Hour Ozone (2015) San Francisco Bay Area, CA - (Marginal)
El Dorado County
PM-2.5 (2006) * Sacramento, CA - (Moderate)
8-Hour Ozone (2008) * Sacramento Metro, CA - (Severe 15)
8-Hour Ozone (2015) * Sacramento Metro, CA - (Serious)
Fresno County
PM-2.5 (1997) San Joaquin Valley, CA - (Serious)
PM-2.5 (2006) San Joaquin Valley, CA - (Serious)
PM-2.5 (2012) San Joaquin Valley, CA - (Serious)
8-Hour Ozone (2008) San Joaquin Valley, CA - (Extreme)
8-Hour Ozone (2015) San Joaquin Valley, CA - (Extreme)
Imperial County
PM-2.5 (2006) * Imperial County, CA - (Moderate)
PM-2.5 (2012) * Imperial County, CA - (Moderate)
8-Hour Ozone (2008) Imperial County, CA - (Moderate)
8-Hour Ozone (2015) Imperial County, CA - (Marginal)
Inyo County
PM-10 (1987) * Inyo County; Owens Valley planning area, CA - (Serious)
Kern County
PM-10 (1987) * East Kern County, CA - (Serious)
PM-2.5 (1997) * San Joaquin Valley, CA - (Serious)
PM-2.5 (2006) * San Joaquin Valley, CA - (Serious)
PM-2.5 (2012) * San Joaquin Valley, CA - (Serious)
8-Hour Ozone (2008) * Kern County (Eastern Kern), CA - (Severe 15)
8-Hour Ozone (2008) * San Joaquin Valley, CA - (Extreme)
8-Hour Ozone (2015) * Kern County (Eastern Kern), CA - (Serious)
8-Hour Ozone (2015) * San Joaquin Valley, CA - (Extreme)
Kings County
PM-2.5 (1997) San Joaquin Valley, CA - (Serious)
PM-2.5 (2006) San Joaquin Valley, CA - (Serious)
PM-2.5 (2012) San Joaquin Valley, CA - (Serious)
8-Hour Ozone (2008) San Joaquin Valley, CA - (Extreme)
8-Hour Ozone (2015) San Joaquin Valley, CA - (Extreme)
Los Angeles County
Lead (2008) * Los Angeles County-South Coast Air Basin, CA
PM-2.5 (1997) * Los Angeles-South Coast Air Basin, CA - (Moderate)
PM-2.5 (2006) * Los Angeles-South Coast Air Basin, CA - (Serious)
PM-2.5 (2012) * Los Angeles-South Coast Air Basin, CA - (Serious)
8-Hour Ozone (2008) * Los Angeles-San Bernardino Counties (West Mojave Desert), CA - (Severe 15)
8-Hour Ozone (2008) * Los Angeles-South Coast Air Basin, CA - (Extreme)
8-Hour Ozone (2015) * Los Angeles-San Bernardino Counties (West Mojave Desert), CA - (Severe 15)
8-Hour Ozone (2015) * Los Angeles-South Coast Air Basin, CA - (Extreme)
Madera County
PM-2.5 (1997) San Joaquin Valley, CA - (Serious)
PM-2.5 (2006) San Joaquin Valley, CA - (Serious)
PM-2.5 (2012) San Joaquin Valley, CA - (Serious)
8-Hour Ozone (2008) San Joaquin Valley, CA - (Extreme)
8-Hour Ozone (2015) San Joaquin Valley, CA - (Extreme)
Marin County
PM-2.5 (2006) San Francisco Bay Area, CA - (Moderate)
8-Hour Ozone (2008) San Francisco Bay Area, CA - (Marginal)
8-Hour Ozone (2015) San Francisco Bay Area, CA - (Marginal)
Mariposa County
8-Hour Ozone (2008) Mariposa County, CA - (Moderate)
8-Hour Ozone (2015) Mariposa County, CA - (Moderate)
Merced County
PM-2.5 (1997) San Joaquin Valley, CA - (Serious)
PM-2.5 (2006) San Joaquin Valley, CA - (Serious)
PM-2.5 (2012) San Joaquin Valley, CA - (Serious)
8-Hour Ozone (2008) San Joaquin Valley, CA - (Extreme)
8-Hour Ozone (2015) San Joaquin Valley, CA - (Extreme)
Mono County
PM-10 (1987) * Mono Basin, CA - (Moderate)
Napa County
PM-2.5 (2006) San Francisco Bay Area, CA - (Moderate)
8-Hour Ozone (2008) San Francisco Bay Area, CA - (Marginal)
8-Hour Ozone (2015) San Francisco Bay Area, CA - (Marginal)
Nevada County
8-Hour Ozone (2008) * Nevada County (Western part), CA - (Serious)
8-Hour Ozone (2015) * Nevada County (Western part), CA - (Serious)
Orange County
PM-2.5 (1997) Los Angeles-South Coast Air Basin, CA - (Moderate)
PM-2.5 (2006) Los Angeles-South Coast Air Basin, CA - (Serious)
PM-2.5 (2012) Los Angeles-South Coast Air Basin, CA - (Serious)
8-Hour Ozone (2008) Los Angeles-South Coast Air Basin, CA - (Extreme)
8-Hour Ozone (2015) Los Angeles-South Coast Air Basin, CA - (Extreme)
Placer County
PM-2.5 (2006) * Sacramento, CA - (Moderate)
8-Hour Ozone (2008) * Sacramento Metro, CA - (Severe 15)
8-Hour Ozone (2015) * Sacramento Metro, CA - (Serious)
Plumas County
PM-2.5 (2012) * Plumas County, CA - (Serious)
Riverside County
PM-10 (1987) * Riverside County; Coachella Valley planning area, CA - (Serious)
PM-2.5 (1997) * Los Angeles-South Coast Air Basin, CA - (Moderate)
PM-2.5 (2006) * Los Angeles-South Coast Air Basin, CA - (Serious)
PM-2.5 (2012) * Los Angeles-South Coast Air Basin, CA - (Serious)
8-Hour Ozone (2008) * Los Angeles-South Coast Air Basin, CA - (Extreme)
8-Hour Ozone (2008) * Morongo Band of Mission Indians, CA - (Severe 15)
8-Hour Ozone (2008) * Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, CA - (Moderate)
8-Hour Ozone (2008) * Riverside County (Coachella Valley), CA - (Extreme)
8-Hour Ozone (2015) * Los Angeles-South Coast Air Basin, CA - (Extreme)
8-Hour Ozone (2015) * Morongo Band of Mission Indians, CA - (Serious)
8-Hour Ozone (2015) * Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, CA - (Moderate)
8-Hour Ozone (2015) * Riverside County (Coachella Valley), CA - (Severe 15)
Sacramento County
PM-2.5 (2006) Sacramento, CA - (Moderate)
8-Hour Ozone (2008) Sacramento Metro, CA - (Severe 15)
8-Hour Ozone (2015) Sacramento Metro, CA - (Serious)
San Bernardino County
PM-10 (1987) * San Bernardino County, CA - (Moderate)
PM-10 (1987) * Trona, CA - (Moderate)
PM-2.5 (1997) * Los Angeles-South Coast Air Basin, CA - (Moderate)
PM-2.5 (2006) * Los Angeles-South Coast Air Basin, CA - (Serious)
PM-2.5 (2012) * Los Angeles-South Coast Air Basin, CA - (Serious)
8-Hour Ozone (2008) * Los Angeles-San Bernardino Counties (West Mojave Desert), CA - (Severe 15)
8-Hour Ozone (2008) * Los Angeles-South Coast Air Basin, CA - (Extreme)
8-Hour Ozone (2015) * Los Angeles-San Bernardino Counties (West Mojave Desert), CA - (Severe 15)
8-Hour Ozone (2015) * Los Angeles-South Coast Air Basin, CA - (Extreme)
San Diego County
8-Hour Ozone (2008) * Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, CA - (Moderate)
8-Hour Ozone (2008) * San Diego County, CA - (Severe 15)
8-Hour Ozone (2015) * Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, CA - (Moderate)
8-Hour Ozone (2015) * San Diego County, CA - (Severe 15)
San Francisco County
PM-2.5 (2006) San Francisco Bay Area, CA - (Moderate)
8-Hour Ozone (2008) San Francisco Bay Area, CA - (Marginal)
8-Hour Ozone (2015) San Francisco Bay Area, CA - (Marginal)
San Joaquin County
PM-2.5 (1997) San Joaquin Valley, CA - (Serious)
PM-2.5 (2006) San Joaquin Valley, CA - (Serious)
PM-2.5 (2012) San Joaquin Valley, CA - (Serious)
8-Hour Ozone (2008) San Joaquin Valley, CA - (Extreme)
8-Hour Ozone (2015) San Joaquin Valley, CA - (Extreme)
San Luis Obispo County
8-Hour Ozone (2008) * San Luis Obispo (Eastern San Luis Obispo), CA - (Marginal)
8-Hour Ozone (2015) * San Luis Obispo (Eastern part), CA - (Marginal)
San Mateo County
PM-2.5 (2006) San Francisco Bay Area, CA - (Moderate)
8-Hour Ozone (2008) San Francisco Bay Area, CA - (Marginal)
8-Hour Ozone (2015) San Francisco Bay Area, CA - (Marginal)
Santa Clara County
PM-2.5 (2006) San Francisco Bay Area, CA - (Moderate)
8-Hour Ozone (2008) San Francisco Bay Area, CA - (Marginal)
8-Hour Ozone (2015) San Francisco Bay Area, CA - (Marginal)
Solano County
PM-2.5 (2006) * Sacramento, CA - (Moderate)
PM-2.5 (2006) * San Francisco Bay Area, CA - (Moderate)
8-Hour Ozone (2008) * Sacramento Metro, CA - (Severe 15)
8-Hour Ozone (2008) * San Francisco Bay Area, CA - (Marginal)
8-Hour Ozone (2015) * Sacramento Metro, CA - (Serious)
8-Hour Ozone (2015) * San Francisco Bay Area, CA - (Marginal)
Sonoma County
PM-2.5 (2006) * San Francisco Bay Area, CA - (Moderate)
8-Hour Ozone (2008) * San Francisco Bay Area, CA - (Marginal)
8-Hour Ozone (2015) * San Francisco Bay Area, CA - (Marginal)
Stanislaus County
PM-2.5 (1997) San Joaquin Valley, CA - (Serious)
PM-2.5 (2006) San Joaquin Valley, CA - (Serious)
PM-2.5 (2012) San Joaquin Valley, CA - (Serious)
8-Hour Ozone (2008) San Joaquin Valley, CA - (Extreme)
8-Hour Ozone (2015) San Joaquin Valley, CA - (Extreme)
Sutter County
8-Hour Ozone (2008) * Sacramento Metro, CA - (Severe 15)
8-Hour Ozone (2015) * Sacramento Metro, CA - (Serious)
8-Hour Ozone (2015) * Sutter Buttes, CA - (Marginal)
Tehama County
8-Hour Ozone (2008) * Tuscan Buttes, CA - (Marginal)
8-Hour Ozone (2015) * Tuscan Buttes, CA - (Marginal (Rural Transport))
Tulare County
PM-2.5 (1997) San Joaquin Valley, CA - (Serious)
PM-2.5 (2006) San Joaquin Valley, CA - (Serious)
PM-2.5 (2012) San Joaquin Valley, CA - (Serious)
8-Hour Ozone (2008) San Joaquin Valley, CA - (Extreme)
8-Hour Ozone (2015) San Joaquin Valley, CA - (Extreme)
Tuolumne County
8-Hour Ozone (2015) Tuolumne County, CA - (Marginal)
Ventura County
8-Hour Ozone (2008) * Ventura County, CA - (Serious)
8-Hour Ozone (2015) * Ventura County, CA - (Serious)
Yolo County
PM-2.5 (2006) * Sacramento, CA - (Moderate)
8-Hour Ozone (2008) Sacramento Metro, CA - (Severe 15)
8-Hour Ozone (2015) Sacramento Metro, CA - (Serious)
COLORADO
Adams County
8-Hour Ozone (2008) Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15)
8-Hour Ozone (2015) Denver Metro/North Front Range, CO - (Moderate)
Arapahoe County
8-Hour Ozone (2008) Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15)
8-Hour Ozone (2015) Denver Metro/North Front Range, CO - (Moderate)
Boulder County
8-Hour Ozone (2008) Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15)
8-Hour Ozone (2015) Denver Metro/North Front Range, CO - (Moderate)
Broomfield County
8-Hour Ozone (2008) Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15)
8-Hour Ozone (2015) Denver Metro/North Front Range, CO - (Moderate)
Denver County
8-Hour Ozone (2008) Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15)
8-Hour Ozone (2015) Denver Metro/North Front Range, CO - (Moderate)
Douglas County
8-Hour Ozone (2008) Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15)
8-Hour Ozone (2015) Denver Metro/North Front Range, CO - (Moderate)
Jefferson County
8-Hour Ozone (2008) Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15)
8-Hour Ozone (2015) Denver Metro/North Front Range, CO - (Moderate)
Larimer County
8-Hour Ozone (2008) * Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15)
8-Hour Ozone (2015) * Denver Metro/North Front Range, CO - (Moderate)
Weld County
8-Hour Ozone (2008) * Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15)
8-Hour Ozone (2015) Denver Metro/North Front Range, CO - (Moderate)
CONNECTICUT
Fairfield County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Hartford County
8-Hour Ozone (2008) Greater Connecticut, CT - (Serious)
8-Hour Ozone (2015) Greater Connecticut, CT - (Moderate)
Litchfield County
8-Hour Ozone (2008) Greater Connecticut, CT - (Serious)
8-Hour Ozone (2015) Greater Connecticut, CT - (Moderate)
Middlesex County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
New Haven County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
New London County
8-Hour Ozone (2008) Greater Connecticut, CT - (Serious)
8-Hour Ozone (2015) Greater Connecticut, CT - (Moderate)
Tolland County
8-Hour Ozone (2008) Greater Connecticut, CT - (Serious)
8-Hour Ozone (2015) Greater Connecticut, CT - (Moderate)
Windham County
8-Hour Ozone (2008) Greater Connecticut, CT - (Serious)
8-Hour Ozone (2015) Greater Connecticut, CT - (Moderate)
DELAWARE
New Castle County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Sussex County
8-Hour Ozone (2008) Seaford, DE - (Marginal)
DISTRICT OF COLUMBIA
District of Columbia
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
GUAM
Guam
Sulfur Dioxide (1971) * Piti, GU
Sulfur Dioxide (1971) * Tanguisson, GU
Sulfur Dioxide (2010) * Piti-Cabras, GU
IDAHO
Bannock County
PM-10 (1987) * Power-Bannock Counties; Fort Hall Indian Reservation, ID - (Moderate)
Power County
PM-10 (1987) * Power-Bannock Counties; Fort Hall Indian Reservation, ID - (Moderate)
ILLINOIS
Cook County
8-Hour Ozone (2015) Chicago, IL-IN-WI - (Moderate)
DuPage County
8-Hour Ozone (2015) Chicago, IL-IN-WI - (Moderate)
Grundy County
8-Hour Ozone (2015) * Chicago, IL-IN-WI - (Moderate)
Kane County
8-Hour Ozone (2015) Chicago, IL-IN-WI - (Moderate)
Kendall County
8-Hour Ozone (2015) * Chicago, IL-IN-WI - (Moderate)
Lake County
8-Hour Ozone (2015) Chicago, IL-IN-WI - (Moderate)
Madison County
Sulfur Dioxide (2010) * Alton Township, IL
8-Hour Ozone (2015) St. Louis, MO-IL - (Moderate)
McHenry County
8-Hour Ozone (2015) Chicago, IL-IN-WI - (Moderate)
Monroe County
8-Hour Ozone (2015) St. Louis, MO-IL - (Moderate)
St. Clair County
8-Hour Ozone (2015) St. Louis, MO-IL - (Moderate)
Will County
8-Hour Ozone (2015) Chicago, IL-IN-WI - (Moderate)
INDIANA
Huntington County
Sulfur Dioxide (2010) * Huntington, IN
Lake County
8-Hour Ozone (2015) * Chicago, IL-IN-WI - (Moderate)
Porter County
8-Hour Ozone (2015) * Chicago, IL-IN-WI - (Moderate)
IOWA
Muscatine County
Sulfur Dioxide (2010) * Muscatine, IA
KANSAS
Saline County
Lead (2008) * Saline County, KS
KENTUCKY
Bullitt County
8-Hour Ozone (2015) Louisville, KY-IN - (Moderate)
Henderson County
Sulfur Dioxide (2010) * Henderson-Webster Counties, KY
Jefferson County
8-Hour Ozone (2015) Louisville, KY-IN - (Moderate)
Oldham County
8-Hour Ozone (2015) Louisville, KY-IN - (Moderate)
Webster County
Sulfur Dioxide (2010) * Henderson-Webster Counties, KY
LOUISIANA
Evangeline Parish
Sulfur Dioxide (2010) * Evangeline Parish (Partial), LA
St. Bernard Parish
Sulfur Dioxide (2010) St. Bernard Parish, LA
MARYLAND
Anne Arundel County
Sulfur Dioxide (2010) * Anne Arundel County and Baltimore County, MD
8-Hour Ozone (2008) Baltimore, MD - (Moderate)
8-Hour Ozone (2015) Baltimore, MD - (Moderate)
Baltimore County
Sulfur Dioxide (2010) * Anne Arundel County and Baltimore County, MD
8-Hour Ozone (2008) Baltimore, MD - (Moderate)
8-Hour Ozone (2015) Baltimore, MD - (Moderate)
Baltimore city
8-Hour Ozone (2008) Baltimore, MD - (Moderate)
8-Hour Ozone (2015) Baltimore, MD - (Moderate)
Calvert County
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
Carroll County
8-Hour Ozone (2008) Baltimore, MD - (Moderate)
8-Hour Ozone (2015) Baltimore, MD - (Moderate)
Cecil County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Charles County
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
Frederick County
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
Harford County
8-Hour Ozone (2008) Baltimore, MD - (Moderate)
8-Hour Ozone (2015) Baltimore, MD - (Moderate)
Howard County
8-Hour Ozone (2008) Baltimore, MD - (Moderate)
8-Hour Ozone (2015) Baltimore, MD - (Moderate)
Montgomery County
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
Prince George's County
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
MASSACHUSETTS
Dukes County
8-Hour Ozone (2008) Dukes County, MA - (Marginal)
MICHIGAN
Allegan County
8-Hour Ozone (2015) * Allegan County, MI - (Moderate)
Berrien County
8-Hour Ozone (2015) Berrien County, MI - (Moderate)
Muskegon County
8-Hour Ozone (2015) * Muskegon County, MI - (Moderate)
St. Clair County
Sulfur Dioxide (2010) * St. Clair, MI
Wayne County
Sulfur Dioxide (2010) * Detroit, MI
MINNESOTA
Dakota County
Lead (2008) * Eagan, MN
MISSOURI
Dent County
Lead (2008) * Iron, Dent, and Reynolds Counties, MO
Franklin County
8-Hour Ozone (2015) * St. Louis, MO-IL - (Moderate)
Iron County
Lead (2008) * Iron, Dent, and Reynolds Counties, MO
Jefferson County
Lead (1978) * Jefferson County (part); Herculaneum, MO
Lead (2008) * Jefferson County, MO
8-Hour Ozone (2015) St. Louis, MO-IL - (Moderate)
New Madrid County
Sulfur Dioxide (2010) * New Madrid County, MO
Reynolds County
Lead (2008) * Iron, Dent, and Reynolds Counties, MO
St. Charles County
8-Hour Ozone (2015) St. Louis, MO-IL - (Moderate)
St. Louis County
8-Hour Ozone (2015) St. Louis, MO-IL - (Moderate)
St. Louis city
8-Hour Ozone (2015) St. Louis, MO-IL - (Moderate)
MONTANA
Lake County
PM-10 (1987) * Lake County; Polson, MT - (Moderate)
PM-10 (1987) * Lake County; Ronan, MT - (Moderate)
Rosebud County
PM-10 (1987) * Rosebud County; Lame Deer, MT - (Moderate)
Yellowstone County
Sulfur Dioxide (1971) * Laurel Area (Yellowstone County), MT
NEVADA
Clark County
8-Hour Ozone (2015) * Las Vegas, NV - (Moderate)
NEW JERSEY
Atlantic County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Bergen County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Burlington County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Camden County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Cape May County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Cumberland County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Essex County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Gloucester County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Hudson County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Hunterdon County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Mercer County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Middlesex County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Monmouth County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Morris County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Ocean County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Passaic County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Salem County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Somerset County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Sussex County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Union County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Warren County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
NEW MEXICO
Dona Ana County
PM-10 (1987) * Dona Ana County; Anthony, NM - (Moderate)
8-Hour Ozone (2015) * El Paso-Las Cruces, TX-NM - (Marginal)
NEW YORK
Bronx County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Chautauqua County
8-Hour Ozone (2008) Jamestown, NY - (Marginal)
Kings County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Nassau County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
New York County
PM-10 (1987) New York County, NY - (Moderate)
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Queens County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Richmond County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Rockland County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
St. Lawrence County
Sulfur Dioxide (2010) * St. Lawrence County, NY
Suffolk County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
Westchester County
8-Hour Ozone (2008) New York-N. New Jersey-Long Island, NY-NJ-CT - (Severe 15)
8-Hour Ozone (2015) New York-Northern New Jersey-Long Island, NY-NJ-CT - (Moderate)
OHIO
Cuyahoga County
8-Hour Ozone (2015) Cleveland, OH - (Moderate)
Geauga County
8-Hour Ozone (2015) Cleveland, OH - (Moderate)
Lake County
8-Hour Ozone (2015) Cleveland, OH - (Moderate)
Lorain County
8-Hour Ozone (2015) Cleveland, OH - (Moderate)
Medina County
8-Hour Ozone (2015) Cleveland, OH - (Moderate)
Morgan County
Sulfur Dioxide (2010) * Muskingum River, OH
Portage County
8-Hour Ozone (2015) Cleveland, OH - (Moderate)
Stark County
Lead (2008) * Canton-Stark County, OH
Summit County
8-Hour Ozone (2015) Cleveland, OH - (Moderate)
Washington County
Sulfur Dioxide (2010) * Muskingum River, OH
OREGON
Klamath County
PM-2.5 (2006) * Klamath Falls, OR - (Moderate)
PENNSYLVANIA
Allegheny County
PM-2.5 (1997) * Liberty-Clairton, PA - (Moderate)
PM-2.5 (2006) * Liberty-Clairton, PA - (Moderate)
PM-2.5 (2012) Allegheny County, PA - (Moderate)
Sulfur Dioxide (2010) * Allegheny, PA
8-Hour Ozone (2008) Pittsburgh-Beaver Valley, PA - (Marginal)
Armstrong County
Sulfur Dioxide (1971) * Armstrong County: Madison, Mahoning, Boggs, Washington, Pine, PA
Sulfur Dioxide (2010) * Indiana, PA
8-Hour Ozone (2008) Pittsburgh-Beaver Valley, PA - (Marginal)
Beaver County
Lead (2008) * Lower Beaver Valley, PA
Sulfur Dioxide (2010) * Beaver, PA
8-Hour Ozone (2008) Pittsburgh-Beaver Valley, PA - (Marginal)
Berks County
Lead (2008) * Lyons, PA
Lead (2008) * North Reading, PA
8-Hour Ozone (2008) Reading, PA - (Marginal)
Bucks County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Butler County
8-Hour Ozone (2008) Pittsburgh-Beaver Valley, PA - (Marginal)
Carbon County
8-Hour Ozone (2008) Allentown-Bethlehem-Easton, PA - (Marginal)
Chester County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Delaware County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Fayette County
8-Hour Ozone (2008) Pittsburgh-Beaver Valley, PA - (Marginal)
Indiana County
Sulfur Dioxide (2010) Indiana, PA
Lancaster County
8-Hour Ozone (2008) Lancaster, PA - (Marginal)
Lehigh County
8-Hour Ozone (2008) Allentown-Bethlehem-Easton, PA - (Marginal)
Montgomery County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Northampton County
8-Hour Ozone (2008) Allentown-Bethlehem-Easton, PA - (Marginal)
Philadelphia County
8-Hour Ozone (2008) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Marginal)
8-Hour Ozone (2015) Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE - (Moderate)
Warren County
Sulfur Dioxide (2010) * Warren, PA
Washington County
8-Hour Ozone (2008) Pittsburgh-Beaver Valley, PA - (Marginal)
Westmoreland County
8-Hour Ozone (2008) Pittsburgh-Beaver Valley, PA - (Marginal)
PUERTO RICO
Arecibo Municipio
Lead (2008) * Arecibo, PR
Bayamon Municipio
Sulfur Dioxide (2010) * San Juan, PR
Catano Municipio
Sulfur Dioxide (2010) San Juan, PR
Guaynabo Municipio
Sulfur Dioxide (2010) * San Juan, PR
Salinas Municipio
Sulfur Dioxide (2010) * Guayama-Salinas, PR
San Juan Municipio
Sulfur Dioxide (2010) * San Juan, PR
Toa Baja Municipio
Sulfur Dioxide (2010) * San Juan, PR
TENNESSEE
Sullivan County
Sulfur Dioxide (2010) * Sullivan County, TN
TEXAS
Anderson County
Sulfur Dioxide (2010) * Freestone and Anderson Counties, TX
Bexar County
8-Hour Ozone (2015) San Antonio, TX - (Moderate)
Brazoria County
8-Hour Ozone (2008) Houston-Galveston-Brazoria, TX - (Severe 15)
8-Hour Ozone (2015) Houston-Galveston-Brazoria, TX - (Moderate)
Chambers County
8-Hour Ozone (2008) Houston-Galveston-Brazoria, TX - (Severe 15)
8-Hour Ozone (2015) Houston-Galveston-Brazoria, TX - (Moderate)
Collin County
8-Hour Ozone (2008) Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015) Dallas-Fort Worth, TX - (Moderate)
Dallas County
8-Hour Ozone (2008) Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015) Dallas-Fort Worth, TX - (Moderate)
Denton County
8-Hour Ozone (2008) Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015) Dallas-Fort Worth, TX - (Moderate)
El Paso County
PM-10 (1987) * El Paso County, TX - (Moderate)
8-Hour Ozone (2015) El Paso-Las Cruces, TX-NM - (Marginal)
Ellis County
8-Hour Ozone (2008) Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015) Dallas-Fort Worth, TX - (Moderate)
Fort Bend County
8-Hour Ozone (2008) Houston-Galveston-Brazoria, TX - (Severe 15)
8-Hour Ozone (2015) Houston-Galveston-Brazoria, TX - (Moderate)
Freestone County
Sulfur Dioxide (2010) * Freestone and Anderson Counties, TX
Galveston County
8-Hour Ozone (2008) Houston-Galveston-Brazoria, TX - (Severe 15)
8-Hour Ozone (2015) Houston-Galveston-Brazoria, TX - (Moderate)
Harris County
8-Hour Ozone (2008) Houston-Galveston-Brazoria, TX - (Severe 15)
8-Hour Ozone (2015) Houston-Galveston-Brazoria, TX - (Moderate)
Howard County
Sulfur Dioxide (2010) * Howard County, TX
Hutchinson County
Sulfur Dioxide (2010) * Hutchinson County, TX
Johnson County
8-Hour Ozone (2008) Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015) Dallas-Fort Worth, TX - (Moderate)
Kaufman County
8-Hour Ozone (2008) Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015) Dallas-Fort Worth, TX - (Moderate)
Liberty County
8-Hour Ozone (2008) Houston-Galveston-Brazoria, TX - (Severe 15)
Montgomery County
8-Hour Ozone (2008) Houston-Galveston-Brazoria, TX - (Severe 15)
8-Hour Ozone (2015) Houston-Galveston-Brazoria, TX - (Moderate)
Navarro County
Sulfur Dioxide (2010) * Navarro County, TX
Panola County
Sulfur Dioxide (2010) * Rusk and Panola Counties, TX
Parker County
8-Hour Ozone (2008) Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015) Dallas-Fort Worth, TX - (Moderate)
Rockwall County
8-Hour Ozone (2008) Dallas-Fort Worth, TX - (Severe 15)
Rusk County
Sulfur Dioxide (2010) * Rusk and Panola Counties, TX
Tarrant County
8-Hour Ozone (2008) Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015) Dallas-Fort Worth, TX - (Moderate)
Titus County
Sulfur Dioxide (2010) * Titus County, TX
Waller County
8-Hour Ozone (2008) Houston-Galveston-Brazoria, TX - (Severe 15)
Wise County
8-Hour Ozone (2008) Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015) Dallas-Fort Worth, TX - (Moderate)
UTAH
Box Elder County
PM-2.5 (2006) * Salt Lake City, UT - (Serious)
Davis County
PM-2.5 (2006) Salt Lake City, UT - (Serious)
8-Hour Ozone (2015) Northern Wasatch Front, UT - (Moderate)
Duchesne County
8-Hour Ozone (2015) * Uinta Basin, UT - (Marginal)
Salt Lake County
PM-2.5 (2006) Salt Lake City, UT - (Serious)
Sulfur Dioxide (1971) Salt Lake County, UT
8-Hour Ozone (2015) Northern Wasatch Front, UT - (Moderate)
Tooele County
PM-2.5 (2006) * Salt Lake City, UT - (Serious)
Sulfur Dioxide (1971) * Tooele County, UT
8-Hour Ozone (2015) * Northern Wasatch Front, UT - (Moderate)
Uintah County
8-Hour Ozone (2015) * Uinta Basin, UT - (Marginal)
Utah County
PM-2.5 (2006) * Provo, UT - (Serious)
8-Hour Ozone (2015) * Southern Wasatch Front, UT - (Marginal)
Weber County
PM-2.5 (2006) * Salt Lake City, UT - (Serious)
8-Hour Ozone (2015) * Northern Wasatch Front, UT - (Moderate)
VIRGINIA
Alexandria city
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
Arlington County
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
Fairfax County
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
Fairfax city
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
Falls Church city
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
Giles County
Sulfur Dioxide (2010) * Giles County, VA
Loudoun County
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
Manassas Park city
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
Manassas city
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
Prince William County
8-Hour Ozone (2015) Washington, DC-MD-VA - (Moderate)
WASHINGTON
Whatcom County
Sulfur Dioxide (2010) * Whatcom County, WA
WISCONSIN
Kenosha County
8-Hour Ozone (2015) * Chicago, IL-IN-WI - (Moderate)
Milwaukee County
8-Hour Ozone (2015) Milwaukee, WI - (Moderate)
Ozaukee County
8-Hour Ozone (2015) Milwaukee, WI - (Moderate)
Racine County
8-Hour Ozone (2015) * Milwaukee, WI - (Moderate)
Sheboygan County
8-Hour Ozone (2015) * Sheboygan County, WI - (Moderate)
Washington County
8-Hour Ozone (2015) * Milwaukee, WI - (Moderate)
Waukesha County
8-Hour Ozone (2015) * Milwaukee, WI - (Moderate)
WYOMING
Lincoln County
8-Hour Ozone (2008) * Upper Green River Basin Area, WY - (Marginal)
Sublette County
8-Hour Ozone (2008) Upper Green River Basin Area, WY - (Marginal)
Sweetwater County
8-Hour Ozone (2008) * Upper Green River Basin Area, WY - (Marginal)


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