Current Nonattainment Counties for All Criteria Pollutants

Data is current as of November 30, 2025

The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.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).

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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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
Hartford County
8-Hour Ozone (2008)				Greater Connecticut, CT - (Serious)
8-Hour Ozone (2015)				Greater Connecticut, CT - (Serious)
Litchfield County
8-Hour Ozone (2008)				Greater Connecticut, CT - (Serious)
8-Hour Ozone (2015)				Greater Connecticut, CT - (Serious)
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 - (Serious)
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 - (Serious)
New London County
8-Hour Ozone (2008)				Greater Connecticut, CT - (Serious)
8-Hour Ozone (2015)				Greater Connecticut, CT - (Serious)
Tolland County
8-Hour Ozone (2008)				Greater Connecticut, CT - (Serious)
8-Hour Ozone (2015)				Greater Connecticut, CT - (Serious)
Windham County
8-Hour Ozone (2008)				Greater Connecticut, CT - (Serious)
8-Hour Ozone (2015)				Greater Connecticut, CT - (Serious)
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 - (Serious)
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 - (Serious)
DuPage County
8-Hour Ozone (2015)				Chicago, IL-IN-WI - (Serious)
Grundy County
8-Hour Ozone (2015)			*	Chicago, IL-IN-WI - (Serious)
Kane County
8-Hour Ozone (2015)				Chicago, IL-IN-WI - (Serious)
Kendall County
8-Hour Ozone (2015)			*	Chicago, IL-IN-WI - (Serious)
Lake County
8-Hour Ozone (2015)				Chicago, IL-IN-WI - (Serious)
Madison County
8-Hour Ozone (2015)				St. Louis, MO-IL - (Serious)
McHenry County
8-Hour Ozone (2015)				Chicago, IL-IN-WI - (Serious)
Monroe County
8-Hour Ozone (2015)				St. Louis, MO-IL - (Serious)
St. Clair County
8-Hour Ozone (2015)				St. Louis, MO-IL - (Serious)
Will County
8-Hour Ozone (2015)				Chicago, IL-IN-WI - (Serious)
INDIANA
Huntington County
Sulfur Dioxide (2010)			*	Huntington, IN
Lake County
8-Hour Ozone (2015)			*	Chicago, IL-IN-WI - (Serious)
Porter County
8-Hour Ozone (2015)			*	Chicago, IL-IN-WI - (Serious)
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 - (Serious)
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 - (Serious)
Baltimore city
8-Hour Ozone (2008)				Baltimore, MD - (Moderate)
8-Hour Ozone (2015)				Baltimore, MD - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
Howard County
8-Hour Ozone (2008)				Baltimore, MD - (Moderate)
8-Hour Ozone (2015)				Baltimore, MD - (Serious)
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 - (Serious)
Berrien County
8-Hour Ozone (2015)				Berrien County, MI - (Serious)
Muskegon County
8-Hour Ozone (2015)			*	Muskegon County, MI - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
St. Louis County
8-Hour Ozone (2015)				St. Louis, MO-IL - (Serious)
St. Louis city
8-Hour Ozone (2015)				St. Louis, MO-IL - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
OHIO
Cuyahoga County
8-Hour Ozone (2015)				Cleveland, OH - (Serious)
Geauga County
8-Hour Ozone (2015)				Cleveland, OH - (Serious)
Lake County
8-Hour Ozone (2015)				Cleveland, OH - (Serious)
Lorain County
8-Hour Ozone (2015)				Cleveland, OH - (Serious)
Medina County
8-Hour Ozone (2015)				Cleveland, OH - (Serious)
Morgan County
Sulfur Dioxide (2010)			*	Muskingum River, OH
Portage County
8-Hour Ozone (2015)				Cleveland, OH - (Serious)
Stark County
Lead (2008)			*	Canton-Stark County, OH
Summit County
8-Hour Ozone (2015)				Cleveland, OH - (Serious)
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 (2012)				Allegheny County, PA - (Moderate)
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 - (Serious)
Butler County
8-Hour Ozone (2008)				Pittsburgh-Beaver Valley, PA - (Marginal)
Cambria County
Sulfur Dioxide (2010)			*	Cambria-Westmoreland Area, PA
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
Warren County
Sulfur Dioxide (2010)			*	Warren, PA
Washington County
8-Hour Ozone (2008)				Pittsburgh-Beaver Valley, PA - (Marginal)
Westmoreland County
Sulfur Dioxide (2010)			*	Cambria-Westmoreland Area, PA
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 - (Serious)
Brazoria County
8-Hour Ozone (2008)				Houston-Galveston-Brazoria, TX - (Severe 15)
8-Hour Ozone (2015)				Houston-Galveston-Brazoria, TX - (Serious)
Chambers County
8-Hour Ozone (2008)				Houston-Galveston-Brazoria, TX - (Severe 15)
8-Hour Ozone (2015)				Houston-Galveston-Brazoria, TX - (Serious)
Collin County
8-Hour Ozone (2008)				Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015)				Dallas-Fort Worth, TX - (Serious)
Dallas County
8-Hour Ozone (2008)				Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015)				Dallas-Fort Worth, TX - (Serious)
Denton County
8-Hour Ozone (2008)				Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015)				Dallas-Fort Worth, TX - (Serious)
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 - (Serious)
Fort Bend County
8-Hour Ozone (2008)				Houston-Galveston-Brazoria, TX - (Severe 15)
8-Hour Ozone (2015)				Houston-Galveston-Brazoria, TX - (Serious)
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 - (Serious)
Harris County
8-Hour Ozone (2008)				Houston-Galveston-Brazoria, TX - (Severe 15)
8-Hour Ozone (2015)				Houston-Galveston-Brazoria, TX - (Serious)
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 - (Serious)
Kaufman County
8-Hour Ozone (2008)				Dallas-Fort Worth, TX - (Severe 15)
8-Hour Ozone (2015)				Dallas-Fort Worth, TX - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
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 - (Serious)
Duchesne County
8-Hour Ozone (2015)			*	Uinta Basin, UT - (Moderate)
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 - (Serious)
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 - (Serious)
Uintah County
8-Hour Ozone (2015)			*	Uinta Basin, UT - (Moderate)
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 - (Serious)
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)
WISCONSIN
Kenosha County
8-Hour Ozone (2015)			*	Chicago, IL-IN-WI - (Serious)
Milwaukee County
8-Hour Ozone (2015)				Milwaukee, WI - (Serious)
Ozaukee County
8-Hour Ozone (2015)				Milwaukee, WI - (Serious)
Racine County
8-Hour Ozone (2015)			*	Milwaukee, WI - (Serious)
Sheboygan County
8-Hour Ozone (2015)			*	Sheboygan County, WI - (Serious)
Washington County
8-Hour Ozone (2015)			*	Milwaukee, WI - (Serious)
Waukesha County
8-Hour Ozone (2015)			*	Milwaukee, WI - (Serious)
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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