8-Hour Ozone (2015) Nonattainment Areas by State/County/Area

Data is current as of November 30, 2025

Click underlined column heading to change report order

State	County	Area Name	County NA Whole/Part	2010 Population	State/ County FIPS
			click link for partial county description	whole or partial county population
ARIZONA	Gila County	Phoenix-Mesa, AZ	Part	56	04/007
ARIZONA	Maricopa County	Phoenix-Mesa, AZ	Part	3,802,075	04/013
ARIZONA	Pinal County	Phoenix-Mesa, AZ	Part	143,009	04/021
ARIZONA	Yuma County	Yuma, AZ	Part	87,254	04/027
CALIFORNIA	Alameda County	San Francisco Bay Area, CA	Whole	1,510,271	06/001
CALIFORNIA	Amador County	Amador County, CA	Whole	38,091	06/005
CALIFORNIA	Butte County	Butte County, CA	Whole	220,000	06/007
CALIFORNIA	Calaveras County	Calaveras County, CA	Whole	45,578	06/009
CALIFORNIA	Contra Costa County	San Francisco Bay Area, CA	Whole	1,049,025	06/013
CALIFORNIA	El Dorado County	Sacramento Metro, CA	Part	150,297	06/017
CALIFORNIA	Fresno County	San Joaquin Valley, CA	Whole	930,450	06/019
CALIFORNIA	Imperial County	Imperial County, CA	Whole	174,528	06/025
CALIFORNIA	Kern County	Kern County (Eastern Kern), CA	Part	95,066	06/029
CALIFORNIA	Kern County	San Joaquin Valley, CA	Part	709,869	06/029
CALIFORNIA	Kings County	San Joaquin Valley, CA	Whole	152,982	06/031
CALIFORNIA	Los Angeles County	Los Angeles-San Bernardino Counties (West Mojave Desert), CA	Part	377,429	06/037
CALIFORNIA	Los Angeles County	Los Angeles-South Coast Air Basin, CA	Part	9,428,411	06/037
CALIFORNIA	Madera County	San Joaquin Valley, CA	Whole	150,865	06/039
CALIFORNIA	Marin County	San Francisco Bay Area, CA	Whole	252,409	06/041
CALIFORNIA	Mariposa County	Mariposa County, CA	Whole	18,251	06/043
CALIFORNIA	Merced County	San Joaquin Valley, CA	Whole	255,793	06/047
CALIFORNIA	Napa County	San Francisco Bay Area, CA	Whole	136,484	06/055
CALIFORNIA	Nevada County	Nevada County (Western part), CA	Part	82,042	06/057
CALIFORNIA	Orange County	Los Angeles-South Coast Air Basin, CA	Whole	3,010,232	06/059
CALIFORNIA	Placer County	Sacramento Metro, CA	Part	337,840	06/061
CALIFORNIA	Riverside County	Los Angeles-South Coast Air Basin, CA	Part	1,737,528	06/065
CALIFORNIA	Riverside County	Morongo Band of Mission Indians, CA	Part	932	06/065
CALIFORNIA	Riverside County	Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, CA	Part	639	06/065
CALIFORNIA	Riverside County	Riverside County (Coachella Valley), CA	Part	425,029	06/065
CALIFORNIA	Sacramento County	Sacramento Metro, CA	Whole	1,418,788	06/067
CALIFORNIA	San Bernardino County	Los Angeles-San Bernardino Counties (West Mojave Desert), CA	Part	489,531	06/071
CALIFORNIA	San Bernardino County	Los Angeles-South Coast Air Basin, CA	Part	1,526,600	06/071
CALIFORNIA	San Diego County	Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, CA	Part	13	06/073
CALIFORNIA	San Diego County	San Diego County, CA	Part	3,077,287	06/073
CALIFORNIA	San Francisco County	San Francisco Bay Area, CA	Whole	805,235	06/075
CALIFORNIA	San Joaquin County	San Joaquin Valley, CA	Whole	685,306	06/077
CALIFORNIA	San Luis Obispo County	San Luis Obispo (Eastern part), CA	Part	1,290	06/079
CALIFORNIA	San Mateo County	San Francisco Bay Area, CA	Whole	718,451	06/081
CALIFORNIA	Santa Clara County	San Francisco Bay Area, CA	Whole	1,781,642	06/085
CALIFORNIA	Solano County	Sacramento Metro, CA	Part	129,291	06/095
CALIFORNIA	Solano County	San Francisco Bay Area, CA	Part	284,053	06/095
CALIFORNIA	Sonoma County	San Francisco Bay Area, CA	Part	431,795	06/097
CALIFORNIA	Stanislaus County	San Joaquin Valley, CA	Whole	514,453	06/099
CALIFORNIA	Sutter County	Sacramento Metro, CA	Part	3,383	06/101
CALIFORNIA	Sutter County	Sutter Buttes, CA	Part	3	06/101
CALIFORNIA	Tehama County	Tuscan Buttes, CA	Part	0	06/103
CALIFORNIA	Tulare County	San Joaquin Valley, CA	Whole	442,179	06/107
CALIFORNIA	Tuolumne County	Tuolumne County, CA	Whole	55,365	06/109
CALIFORNIA	Ventura County	Ventura County, CA	Part	820,808	06/111
CALIFORNIA	Yolo County	Sacramento Metro, CA	Whole	200,849	06/113
COLORADO	Adams County	Denver Metro/North Front Range, CO	Whole	441,603	08/001
COLORADO	Arapahoe County	Denver Metro/North Front Range, CO	Whole	572,003	08/005
COLORADO	Boulder County	Denver Metro/North Front Range, CO	Whole	294,567	08/013
COLORADO	Broomfield County	Denver Metro/North Front Range, CO	Whole	55,889	08/014
COLORADO	Denver County	Denver Metro/North Front Range, CO	Whole	600,158	08/031
COLORADO	Douglas County	Denver Metro/North Front Range, CO	Whole	285,465	08/035
COLORADO	Jefferson County	Denver Metro/North Front Range, CO	Whole	534,543	08/059
COLORADO	Larimer County	Denver Metro/North Front Range, CO	Part	294,170	08/069
COLORADO	Weld County	Denver Metro/North Front Range, CO	Whole	252,825	08/123
CONNECTICUT	Fairfield County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	916,829	09/001
CONNECTICUT	Hartford County	Greater Connecticut, CT	Whole	894,014	09/003
CONNECTICUT	Litchfield County	Greater Connecticut, CT	Whole	189,927	09/005
CONNECTICUT	Middlesex County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	165,676	09/007
CONNECTICUT	New Haven County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	862,477	09/009
CONNECTICUT	New London County	Greater Connecticut, CT	Whole	274,055	09/011
CONNECTICUT	Tolland County	Greater Connecticut, CT	Whole	152,691	09/013
CONNECTICUT	Windham County	Greater Connecticut, CT	Whole	118,428	09/015
DELAWARE	New Castle County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	538,479	10/003
DISTRICT OF COLUMBIA	District of Columbia	Washington, DC-MD-VA	Whole	601,723	11/001
ILLINOIS	Cook County	Chicago, IL-IN-WI	Whole	5,194,675	17/031
ILLINOIS	DuPage County	Chicago, IL-IN-WI	Whole	916,924	17/043
ILLINOIS	Grundy County	Chicago, IL-IN-WI	Part	19,251	17/063
ILLINOIS	Kane County	Chicago, IL-IN-WI	Whole	515,269	17/089
ILLINOIS	Kendall County	Chicago, IL-IN-WI	Part	49,334	17/093
ILLINOIS	Lake County	Chicago, IL-IN-WI	Whole	703,462	17/097
ILLINOIS	Madison County	St. Louis, MO-IL	Whole	269,282	17/119
ILLINOIS	McHenry County	Chicago, IL-IN-WI	Whole	308,760	17/111
ILLINOIS	Monroe County	St. Louis, MO-IL	Whole	32,957	17/133
ILLINOIS	St. Clair County	St. Louis, MO-IL	Whole	270,056	17/163
ILLINOIS	Will County	Chicago, IL-IN-WI	Whole	677,560	17/197
INDIANA	Lake County	Chicago, IL-IN-WI	Part	421,162	18/089
INDIANA	Porter County	Chicago, IL-IN-WI	Part	140,700	18/127
KENTUCKY	Bullitt County	Louisville, KY-IN	Whole	74,319	21/029
KENTUCKY	Jefferson County	Louisville, KY-IN	Whole	741,096	21/111
KENTUCKY	Oldham County	Louisville, KY-IN	Whole	60,316	21/185
MARYLAND	Anne Arundel County	Baltimore, MD	Whole	537,656	24/003
MARYLAND	Baltimore County	Baltimore, MD	Whole	805,029	24/005
MARYLAND	Baltimore city	Baltimore, MD	Whole	620,961	24/510
MARYLAND	Calvert County	Washington, DC-MD-VA	Whole	88,737	24/009
MARYLAND	Carroll County	Baltimore, MD	Whole	167,134	24/013
MARYLAND	Cecil County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	101,108	24/015
MARYLAND	Charles County	Washington, DC-MD-VA	Whole	146,551	24/017
MARYLAND	Frederick County	Washington, DC-MD-VA	Whole	233,385	24/021
MARYLAND	Harford County	Baltimore, MD	Whole	244,826	24/025
MARYLAND	Howard County	Baltimore, MD	Whole	287,085	24/027
MARYLAND	Montgomery County	Washington, DC-MD-VA	Whole	971,777	24/031
MARYLAND	Prince George's County	Washington, DC-MD-VA	Whole	863,420	24/033
MICHIGAN	Allegan County	Allegan County, MI	Part	46,615	26/005
MICHIGAN	Berrien County	Berrien County, MI	Whole	156,813	26/021
MICHIGAN	Muskegon County	Muskegon County, MI	Part	146,852	26/121
MISSOURI	Franklin County	St. Louis, MO-IL	Part	18,108	29/071
MISSOURI	Jefferson County	St. Louis, MO-IL	Whole	218,733	29/099
MISSOURI	St. Charles County	St. Louis, MO-IL	Whole	360,485	29/183
MISSOURI	St. Louis County	St. Louis, MO-IL	Whole	998,954	29/189
MISSOURI	St. Louis city	St. Louis, MO-IL	Whole	319,294	29/510
NEVADA	Clark County	Las Vegas, NV	Part	1,892,250	32/003
NEW JERSEY	Atlantic County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	274,549	34/001
NEW JERSEY	Bergen County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	905,116	34/003
NEW JERSEY	Burlington County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	448,734	34/005
NEW JERSEY	Camden County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	513,657	34/007
NEW JERSEY	Cape May County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	97,265	34/009
NEW JERSEY	Cumberland County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	156,898	34/011
NEW JERSEY	Essex County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	783,969	34/013
NEW JERSEY	Gloucester County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	288,288	34/015
NEW JERSEY	Hudson County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	634,266	34/017
NEW JERSEY	Hunterdon County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	128,349	34/019
NEW JERSEY	Mercer County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	366,513	34/021
NEW JERSEY	Middlesex County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	809,858	34/023
NEW JERSEY	Monmouth County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	630,380	34/025
NEW JERSEY	Morris County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	492,276	34/027
NEW JERSEY	Ocean County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	576,567	34/029
NEW JERSEY	Passaic County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	501,226	34/031
NEW JERSEY	Salem County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	66,083	34/033
NEW JERSEY	Somerset County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	323,444	34/035
NEW JERSEY	Sussex County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	149,265	34/037
NEW JERSEY	Union County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	536,499	34/039
NEW JERSEY	Warren County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	108,692	34/041
NEW MEXICO	Dona Ana County	El Paso-Las Cruces, TX-NM	Part	12,675	35/013
NEW YORK	Bronx County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	1,385,108	36/005
NEW YORK	Kings County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	2,504,700	36/047
NEW YORK	Nassau County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	1,339,532	36/059
NEW YORK	New York County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	1,585,873	36/061
NEW YORK	Queens County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	2,230,722	36/081
NEW YORK	Richmond County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	468,730	36/085
NEW YORK	Rockland County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	311,687	36/087
NEW YORK	Suffolk County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	1,493,350	36/103
NEW YORK	Westchester County	New York-Northern New Jersey-Long Island, NY-NJ-CT	Whole	949,113	36/119
OHIO	Cuyahoga County	Cleveland, OH	Whole	1,280,122	39/035
OHIO	Geauga County	Cleveland, OH	Whole	93,389	39/055
OHIO	Lake County	Cleveland, OH	Whole	230,041	39/085
OHIO	Lorain County	Cleveland, OH	Whole	301,356	39/093
OHIO	Medina County	Cleveland, OH	Whole	172,332	39/103
OHIO	Portage County	Cleveland, OH	Whole	161,419	39/133
OHIO	Summit County	Cleveland, OH	Whole	541,781	39/153
PENNSYLVANIA	Bucks County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	625,249	42/017
PENNSYLVANIA	Chester County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	498,886	42/029
PENNSYLVANIA	Delaware County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	558,979	42/045
PENNSYLVANIA	Montgomery County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	799,874	42/091
PENNSYLVANIA	Philadelphia County	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE	Whole	1,526,006	42/101
TEXAS	Bexar County	San Antonio, TX	Whole	1,714,773	48/029
TEXAS	Brazoria County	Houston-Galveston-Brazoria, TX	Whole	313,166	48/039
TEXAS	Chambers County	Houston-Galveston-Brazoria, TX	Whole	35,096	48/071
TEXAS	Collin County	Dallas-Fort Worth, TX	Whole	782,341	48/085
TEXAS	Dallas County	Dallas-Fort Worth, TX	Whole	2,368,139	48/113
TEXAS	Denton County	Dallas-Fort Worth, TX	Whole	662,614	48/121
TEXAS	El Paso County	El Paso-Las Cruces, TX-NM	Whole	800,647	48/141
TEXAS	Ellis County	Dallas-Fort Worth, TX	Whole	149,610	48/139
TEXAS	Fort Bend County	Houston-Galveston-Brazoria, TX	Whole	585,375	48/157
TEXAS	Galveston County	Houston-Galveston-Brazoria, TX	Whole	291,309	48/167
TEXAS	Harris County	Houston-Galveston-Brazoria, TX	Whole	4,092,459	48/201
TEXAS	Johnson County	Dallas-Fort Worth, TX	Whole	150,934	48/251
TEXAS	Kaufman County	Dallas-Fort Worth, TX	Whole	103,350	48/257
TEXAS	Montgomery County	Houston-Galveston-Brazoria, TX	Whole	455,746	48/339
TEXAS	Parker County	Dallas-Fort Worth, TX	Whole	116,927	48/367
TEXAS	Tarrant County	Dallas-Fort Worth, TX	Whole	1,809,034	48/439
TEXAS	Wise County	Dallas-Fort Worth, TX	Whole	59,127	48/497
UTAH	Davis County	Northern Wasatch Front, UT	Whole	306,479	49/011
UTAH	Duchesne County	Uinta Basin, UT	Part	15,338	49/013
UTAH	Salt Lake County	Northern Wasatch Front, UT	Whole	1,029,655	49/035
UTAH	Tooele County	Northern Wasatch Front, UT	Part	54,857	49/045
UTAH	Uintah County	Uinta Basin, UT	Part	31,979	49/047
UTAH	Utah County	Southern Wasatch Front, UT	Part	515,895	49/049
UTAH	Weber County	Northern Wasatch Front, UT	Part	224,583	49/057
VIRGINIA	Alexandria city	Washington, DC-MD-VA	Whole	139,966	51/510
VIRGINIA	Arlington County	Washington, DC-MD-VA	Whole	207,627	51/013
VIRGINIA	Fairfax County	Washington, DC-MD-VA	Whole	1,081,726	51/059
VIRGINIA	Fairfax city	Washington, DC-MD-VA	Whole	22,565	51/600
VIRGINIA	Falls Church city	Washington, DC-MD-VA	Whole	12,332	51/610
VIRGINIA	Loudoun County	Washington, DC-MD-VA	Whole	312,311	51/107
VIRGINIA	Manassas Park city	Washington, DC-MD-VA	Whole	14,273	51/685
VIRGINIA	Manassas city	Washington, DC-MD-VA	Whole	37,821	51/683
VIRGINIA	Prince William County	Washington, DC-MD-VA	Whole	402,002	51/153
WISCONSIN	Kenosha County	Chicago, IL-IN-WI	Part	127,547	55/059
WISCONSIN	Milwaukee County	Milwaukee, WI	Whole	947,735	55/079
WISCONSIN	Ozaukee County	Milwaukee, WI	Whole	86,395	55/089
WISCONSIN	Racine County	Milwaukee, WI	Part	152,786	55/101
WISCONSIN	Sheboygan County	Sheboygan County, WI	Part	67,710	55/117
WISCONSIN	Washington County	Milwaukee, WI	Part	77,434	55/131
WISCONSIN	Waukesha County	Milwaukee, WI	Part	383,334	55/133

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