1-Hour Ozone (1979) Designated Area/State Information with Design Values - NAAQS Revoked

Data is current as of June 30, 2025
Design Values in ppm. "Current Design Values" are current as of the posted Green Book date. Check the Air Quality Design Value site for design value updates.

Display:       Nonattainment and Maintenance Areas       Nonattainment Areas       Maintenance Areas

Click underlined column heading to change report order				Design Values at the Time of Designation		Current Design Values as of 05/28/2025 (2022-2024)
Area Name	State	Current Status	class sort	Current Classification or at Redesignation	Design Values	Monitoring Years	Design Values	Meets NAAQS Determin.1	No. Ctys	2010 Population	EPA Region
click area name for state/county list				click for classification history
						Total Areas		Total Ctys	Total Population (2000)
Nonattainment						63		219	103,431,708
Maintenance						73		191	62,150,220
Nonattainment and Maintenance						136		409	165,581,928
Albany-Schenectady-Troy, NY	NY	Nonattainment	G	Marginal	0.128	1987-1989	0.078	Yes	6	892,196	02
Allegan County, MI	MI	Maintenance	K	Incomplete Data			0.093	Yes	1	105,665	05
Allentown-Bethlehem-Easton, PA-NJ	NJ	Nonattainment	G	Marginal	0.137	1987-1989	0.077	Yes	1	102,437	02
Allentown-Bethlehem-Easton, PA-NJ	PA	Nonattainment	G	Marginal	0.137	1987-1989	0.077	Yes	3	637,958	03
Altoona, PA	PA	Nonattainment	G	Marginal	0.129	1987-1989	0.077	Yes	1	129,144	03
Atlanta, GA	GA	Maintenance	C	Severe-15	0.162	1987-1989	0.100	Yes	13	3,698,679	04
Atlantic City, NJ	NJ	Nonattainment	E	Moderate	0.145	1987-1989	0.069	Yes	2	354,878	02
Baltimore, MD	MD	Nonattainment	C	Severe-15	0.194	1987-1989	0.090	Yes	6	2,512,431	03
Baton Rouge, LA	LA	Nonattainment	C	Severe-15	0.164	1987-1989	0.100	Yes	5	636,214	06
Beaumont-Port Arthur, TX	TX	Nonattainment	D	Serious	0.158	1987-1989	0.091	Yes	3	385,090	06
Beauregard Parish, LA	LA	Maintenance	K	Incomplete Data					1	32,986	06
Birmingham, AL	AL	Maintenance	G	Marginal	0.133	1987-1989	0.085	Yes	2	805,340	04
Boston-Lawrence-Worcester (E. Mass), MA-NH	MA	Nonattainment	D	Serious	0.165	1987-1989	0.085	Yes	10	5,534,130	01
Boston-Lawrence-Worcester (E. Mass), MA-NH	NH	Nonattainment	D	Serious	0.165	1987-1989	0.085	Yes	2	349,352	01
Buffalo-Niagara Falls, NY	NY	Nonattainment	G	Marginal	0.131	1987-1989	0.075	Yes	2	1,170,111	02
Canton, OH	OH	Maintenance	G	Marginal	0.135	1987-1989	0.082	Yes	1	378,098	05
Charleston, WV	WV	Maintenance	E	Moderate	0.138	1987-1989	0.072	Yes	2	251,662	03
Charlotte-Gastonia, NC	NC	Maintenance	E	Moderate	0.158	1987-1989	0.091	Yes	2	885,819	04
Cherokee County, SC	SC	Maintenance	G	Marginal	0.132	1987-1989		Insufficient Data	1	52,537	04
Cheshire County, NH	NH	Nonattainment	K	Incomplete Data			0.073	Yes	1	73,825	01
Chicago-Gary-Lake County, IL-IN	IL	Nonattainment	B	Severe-17	0.190	1987-1989	0.097	Yes	8	8,126,446	05
Chicago-Gary-Lake County, IL-IN	IN	Nonattainment	B	Severe-17	0.190	1987-1989	0.097	Yes	2	631,362	05
Chico, CA	CA	Nonattainment	J	Section 185A	0.100	1987-1989	0.076	Yes	1	203,171	09
Cincinnati-Hamilton, OH-KY	KY	Maintenance	E	Moderate	0.157	1987-1989	0.088	Yes	3	326,071	04
Cincinnati-Hamilton, OH-KY	OH	Maintenance	E	Moderate	0.157	1987-1989	0.088	Yes	4	1,514,470	05
Cleveland-Akron-Lorain, OH	OH	Maintenance	E	Moderate	0.157	1987-1989	0.089	Yes	8	2,945,831	05
Clinton County, OH	OH	Maintenance	J	Section 185A	0.121	1987-1989	0.084	Yes	1	40,543	05
Columbiana County, OH	OH	Maintenance	K	Incomplete Data					1	112,075	05
Columbus, OH	OH	Maintenance	G	Marginal	0.131	1987-1989	0.078	Yes	3	1,324,458	05
Crawford County, PA	PA	Nonattainment	K	Incomplete Data					1	90,366	03
Dallas-Fort Worth, TX	TX	Nonattainment	D	Serious	0.140	1987-1989	0.106	Yes	4	4,589,769	06
Dayton-Springfield, OH	OH	Maintenance	E	Moderate	0.143	1987-1989	0.082	Yes	4	950,558	05
Denver-Boulder, CO	CO	Maintenance	J	Section 185A	0.122	1987-1989	0.099	Yes	7	2,389,470	08
Detroit-Ann Arbor, MI	MI	Maintenance	E	Moderate	0.144	1987-1989	0.090	Yes	7	4,833,493	05
Dona Ana County (part); Sunland Park, NM	NM	Nonattainment	G	Marginal	0.127	1987-1989	0.093	Yes	1	10,306	06
Door County, WI	WI	Maintenance	H	Rural Transport (Marginal)	0.126	1987-1989	0.090	Yes	1	27,961	05
East Kern County, CA	CA	Maintenance	D	Serious	0.170	1987-1989	0.085	Yes	1	111,425	09
Edmonson County, KY	KY	Maintenance	H	Rural Transport (Marginal)	0.140	1987-1989	0.074	Yes	1	11,644	04
El Paso, TX	TX	Nonattainment	D	Serious	0.170	1987-1989	0.090	Yes	1	679,622	06
Erie, PA	PA	Nonattainment	G	Marginal	0.129	1987-1989	0.076	Yes	1	280,843	03
Essex County; Whiteface Mountain, NY	NY	Nonattainment	H	Rural Transport (Marginal)	0.127	1987-1989	0.074	Yes	1	0	02
Evansville, IN	IN	Maintenance	G	Marginal	0.124	1987-1989	0.083	Yes	1	171,922	05
Flint, MI	MI	Maintenance	J	Section 185A	0.124	1987-1989	0.081	Yes	1	436,141	05
Franklin County, PA	PA	Nonattainment	K	Incomplete Data			0.078	Yes	1	129,313	03
Grand Rapids, MI	MI	Maintenance	E	Moderate	0.143	1987-1989	0.086	Yes	2	812,649	05
Grant Parish, LA	LA	Maintenance	K	Incomplete Data					1	18,698	06
Greater Connecticut, CT	CT	Nonattainment	D	Serious	0.172	1987-1989	0.104	Yes	8	2,532,154	01
Greenbrier, WV	WV	Maintenance	G	Marginal	0.125	1987-1989	0.065	Yes	1	34,453	03
Greene County, PA	PA	Nonattainment	K	Incomplete Data			0.073	Yes	1	40,672	03
Greensboro-Winston-Salem-High Point, NC	NC	Maintenance	E	Moderate	0.151	1987-1989	0.080	Yes	4	874,362	04
Hancock County and Waldo County, ME	ME	Maintenance	G	Marginal	0.133	1987-1989	0.084	Yes	2	88,071	01
Harrisburg-Lebanon-Carlisle, PA	PA	Nonattainment	G	Marginal	0.136	1987-1989	0.081	Yes	4	629,401	03
Houston-Galveston-Brazoria, TX	TX	Nonattainment	B	Severe-17	0.220	1987-1989	0.125	No	8	4,669,571	06
Huntington-Ashland, WV-KY	KY	Maintenance	E	Moderate	0.164	1987-1989	0.078	Yes	2	66,877	04
Huntington-Ashland, WV-KY	WV	Maintenance	E	Moderate	0.164	1987-1989	0.078	Yes	2	139,687	03
Imperial County, CA	CA	Nonattainment	J	Section 185A	0.110	1987-1989	0.113	Yes	1	142,361	09
Indianapolis, IN	IN	Maintenance	G	Marginal	0.121	1987-1989	0.085	Yes	1	860,454	05
Jacksonville, FL	FL	Maintenance	J	Section 185A	0.119	1987-1989	0.078	Yes	1	778,879	04
Jefferson County, NY	NY	Nonattainment	G	Marginal	0.143	1987-1989	0.073	Yes	1	111,738	02
Jersey County, IL	IL	Maintenance	G	Marginal	0.128	1987-1989	0.090	Yes	1	21,668	05
Johnstown, PA	PA	Nonattainment	G	Marginal	0.133	1987-1989	0.074	Yes	2	232,621	03
Juniata County, PA	PA	Nonattainment	K	Incomplete Data					1	22,821	03
Kansas City, MO-KS	KS	Maintenance	F	Other	0.120	1987-1989	0.090	Yes	2	608,968	07
Kansas City, MO-KS	MO	Maintenance	F	Other	0.120	1987-1989	0.090	Yes	3	912,667	07
Kent County and Queen Anne's County, MD	MD	Maintenance	G	Marginal	0.131	1987-1989	0.082	Yes	2	59,760	03
Kewaunee County, WI	WI	Maintenance	E	Moderate	0.147	1987-1989	0.098	Yes	1	20,187	05
Knox County and Lincoln County, ME	ME	Nonattainment	E	Moderate	0.158	1987-1989	0.070	Yes	2	73,234	01
Knoxville, TN	TN	Maintenance	G	Marginal	0.135	1987-1989	0.075	Yes	1	382,032	04
Lafayette, LA	LA	Maintenance	J	Section 185A	0.105	1987-1989	0.081	Yes	1	190,503	06
Lafourche Parish, LA	LA	Maintenance	K	Incomplete Data			0.077	Yes	1	89,974	06
Lake Charles, LA	LA	Maintenance	G	Marginal	0.131	1987-1989	0.094	Yes	1	183,577	06
Lancaster, PA	PA	Nonattainment	G	Marginal	0.125	1987-1989	0.078	Yes	1	470,658	03
Lawrence County, PA	PA	Nonattainment	K	Incomplete Data			0.082	Yes	1	94,643	03
Lewiston-Auburn, ME	ME	Nonattainment	E	Moderate	0.137	1987-1989	0.074	Yes	2	220,907	01
Lexington-Fayette, KY	KY	Maintenance	G	Marginal	0.126	1987-1989	0.074	Yes	2	293,573	04
Los Angeles-South Coast Air Basin, CA	CA	Nonattainment	A	Extreme	0.330	1987-1989	0.143	No	4	14,593,587	09
Louisville, KY-IN	IN	Maintenance	E	Moderate	0.149	1987-1989	0.097	Yes	2	167,295	05
Louisville, KY-IN	KY	Maintenance	E	Moderate	0.149	1987-1989	0.097	Yes	3	716,054	04
Manchester, NH	NH	Nonattainment	G	Marginal	0.128	1987-1989	0.081	Yes	3	364,927	01
Manitowoc County, WI	WI	Maintenance	E	Moderate	0.167	1987-1989	0.092	Yes	1	82,887	05
Memphis, TN	TN	Maintenance	G	Marginal	0.140	1987-1989	0.092	Yes	1	897,472	04
Miami-Fort Lauderdale-W. Palm Beach, FL	FL	Maintenance	E	Moderate	0.138	1987-1989	0.080	Yes	3	5,007,564	04
Milwaukee-Racine, WI	WI	Nonattainment	B	Severe-17	0.183	1987-1989	0.106	Yes	6	1,839,149	05
Monterey Bay, CA	CA	Maintenance	E	Moderate	0.138	1987-1989	0.075	Yes	3	710,598	09
Morongo Band of Mission Indians, CA	CA	Nonattainment	B	Severe-17			0.136	No	1	0	09
Muskegon, MI	MI	Maintenance	E	Moderate	0.181	1987-1989	0.091	Yes	1	170,200	05
Nashville, TN	TN	Maintenance	E	Moderate	0.138	1987-1989	0.089	Yes	5	1,097,810	04
New Orleans, LA	LA	Maintenance	J	Section 185A	0.121	1987-1989	0.082	Yes	4	1,055,441	06
New York-N. New Jersey-Long Island, NY-NJ-CT	CT	Nonattainment	B	Severe-17	0.201	1987-1989	0.109	Yes	2	873,411	01
New York-N. New Jersey-Long Island, NY-NJ-CT	NJ	Nonattainment	B	Severe-17	0.201	1987-1989	0.109	Yes	12	6,208,552	02
New York-N. New Jersey-Long Island, NY-NJ-CT	NY	Nonattainment	B	Severe-17	0.201	1987-1989	0.109	Yes	10	12,089,343	02
Norfolk-Virginia Beach-Newport News (Hampton Roads), VA	VA	Maintenance	G	Marginal	0.130	1987-1989	0.074	Yes	11	1,477,636	03
Northumberland County, PA	PA	Nonattainment	K	Incomplete Data					1	94,556	03
Owensboro, KY	KY	Maintenance	G	Marginal	0.137	1987-1989	0.079	Yes	2	92,389	04
Paducah, KY	KY	Maintenance	G	Marginal	0.124	1987-1989	0.077	Yes	2	31,404	04
Parkersburg-Marietta, WV	WV	Maintenance	E	Moderate	0.152	1987-1989	0.082	Yes	1	87,986	03
Philadelphia-Wilmington-Trenton, PA-NJ-DE-MD	DE	Nonattainment	C	Severe-15	0.187	1987-1989	0.091	Yes	2	626,962	03
Philadelphia-Wilmington-Trenton, PA-NJ-DE-MD	MD	Nonattainment	C	Severe-15	0.187	1987-1989	0.091	Yes	1	85,951	03
Philadelphia-Wilmington-Trenton, PA-NJ-DE-MD	NJ	Nonattainment	C	Severe-15	0.187	1987-1989	0.091	Yes	6	1,748,483	02
Philadelphia-Wilmington-Trenton, PA-NJ-DE-MD	PA	Nonattainment	C	Severe-15	0.187	1987-1989	0.091	Yes	5	3,849,647	03
Phoenix, AZ	AZ	Maintenance	D	Serious	0.141	1987-1989	0.103	Yes	1	3,028,832	09
Pike County, PA	PA	Nonattainment	K	Incomplete Data					1	46,302	03
Pittsburgh-Beaver Valley, PA	PA	Maintenance	E	Moderate	0.149	1987-1989	0.084	Yes	7	2,431,087	03
Pointe Coupee Parish, LA	LA	Maintenance	G	Marginal	0.127	1987-1989	0.082	Yes	1	22,763	06
Portland, ME	ME	Nonattainment	E	Moderate	0.156	1987-1989	0.080	Yes	3	487,568	01
Portland-Vancouver AQMA, OR-WA	OR	Maintenance	G	Marginal	0.128	1987-1989	0.082	Yes	3	1,104,341	10
Portland-Vancouver AQMA, OR-WA	WA	Maintenance	G	Marginal	0.128	1987-1989	0.082	Yes	1	333,569	10
Portsmouth-Dover-Rochester, NH	NH	Nonattainment	D	Serious	0.165	1987-1989	0.081	Yes	2	192,379	01
Poughkeepsie, NY	NY	Nonattainment	E	Moderate	0.134	1987-1989	0.098	Yes	3	600,322	02
Preble County, OH	OH	Maintenance	J	Section 185A	0.118	1987-1989	0.078	Yes	1	42,337	05
Providence (all of RI), RI	RI	Nonattainment	D	Serious	0.162	1987-1989	0.093	Yes	5	1,048,319	01
Raleigh-Durham, NC	NC	Maintenance	E	Moderate	0.141	1987-1989	0.079	Yes	3	864,961	04
Reading, PA	PA	Maintenance	E	Moderate	0.141	1987-1989	0.086	Yes	1	373,638	03
Reno, NV	NV	Nonattainment	G	Marginal	0.131	1987-1989	0.077	Yes	1	339,486	09
Richmond, VA	VA	Maintenance	E	Moderate	0.142	1987-1989	0.079	Yes	7	845,623	03
Sacramento Metro, CA	CA	Nonattainment	C	Severe-15	0.160	1987-1989	0.094	Yes	6	1,978,348	09
Saginaw-Bay City-Midland, MI	MI	Maintenance	K	Incomplete Data					3	403,070	05
Salem, OR	OR	Nonattainment	K	Incomplete Data			0.079	Yes	2	345,261	10
Salt Lake City, UT	UT	Maintenance	E	Moderate	0.143	1987-1989	0.097	Yes	2	1,137,381	08
San Diego, CA	CA	Maintenance	D	Serious	0.185	1987-1989	0.101	Yes	1	2,813,833	09
San Francisco-Bay Area, CA	CA	Nonattainment	F	Other	0.140	1987-1989	0.087	Yes	9	6,541,828	09
San Joaquin Valley, CA	CA	Nonattainment	A	Extreme	0.170	1987-1989	0.114	Yes	8	3,191,367	09
Santa Barbara-Santa Maria-Lompoc, CA	CA	Maintenance	D	Serious	0.140	1987-1989	0.073	Yes	1	399,347	09
Schuylkill County, PA	PA	Nonattainment	K	Incomplete Data					1	150,336	03
Scranton-Wilkes-Barre, PA	PA	Nonattainment	G	Marginal	0.129	1987-1989	0.081	Yes	5	763,463	03
Seattle-Tacoma, WA	WA	Maintenance	G	Marginal	0.131	1987-1989	0.090	Yes	3	3,043,878	10
Sheboygan, WI	WI	Maintenance	E	Moderate	0.176	1987-1989	0.104	Yes	1	112,646	05
Smyth County; White Top Mountain, VA	VA	Nonattainment	H	Rural Transport (Marginal)	0.125	1987-1989			1	0	03
Snyder County, PA	PA	Nonattainment	K	Incomplete Data					1	37,546	03
South Bend-Elkhart, IN	IN	Maintenance	G	Marginal	0.121	1987-1989	0.083	Yes	2	448,350	05
Southeast Desert Modified AQMA, CA	CA	Nonattainment	B	Severe-17	0.240	1987-1989	0.109		3	981,158	09
Springfield (Western MA), MA	MA	Nonattainment	D	Serious	0.167	1987-1989	0.090	Yes	4	814,967	01
St. James Parish, LA	LA	Maintenance	K	Incomplete Data			0.084	Yes	1	21,216	06
St. Louis, MO-IL	IL	Maintenance	D	Serious	0.156	1987-1989	0.090	Yes	3	542,642	05
St. Louis, MO-IL	MO	Maintenance	D	Serious	0.156	1987-1989	0.090	Yes	5	1,940,293	07
St. Mary Parish, LA	LA	Maintenance	K	Incomplete Data					1	53,500	06
Steubenville, OH	OH	Maintenance	J	Section 185A	0.118	1987-1989	0.076	Yes	1	73,894	05
Susquehanna County, PA	PA	Nonattainment	K	Incomplete Data					1	42,238	03
Sussex County, DE	DE	Nonattainment	G	Marginal	0.130	1987-1989	0.074	Yes	1	156,638	03
Tampa-St. Petersburg-Clearwater, FL	FL	Maintenance	G	Marginal	0.129	1987-1989	0.086	Yes	2	1,920,430	04
Toledo, OH	OH	Maintenance	E	Moderate	0.140	1987-1989	0.085	Yes	2	576,119	05
Ventura County, CA	CA	Nonattainment	C	Severe-15	0.170	1987-1989	0.093	Yes	1	753,197	09
Victoria, TX	TX	Maintenance	K	Incomplete Data			0.074	Yes	1	84,088	06
Walworth County, WI	WI	Maintenance	G	Marginal	0.129	1987-1989	0.089	Yes	1	93,759	05
Warren County, PA	PA	Nonattainment	K	Incomplete Data					1	43,863	03
Washington, DC-MD-VA	DC	Nonattainment	C	Severe-15	0.165	1987-1989	0.090	Yes	1	572,059	03
Washington, DC-MD-VA	MD	Nonattainment	C	Severe-15	0.165	1987-1989	0.090	Yes	5	2,065,242	03
Washington, DC-MD-VA	VA	Nonattainment	C	Severe-15	0.165	1987-1989	0.090	Yes	10	1,907,643	03
Wayne County, PA	PA	Nonattainment	K	Incomplete Data					1	47,722	03
York, PA	PA	Nonattainment	G	Marginal	0.129	1987-1989	0.077	Yes	2	473,043	03
Youngstown-Warren-Sharon, OH-PA	OH	Maintenance	G	Marginal	0.134	1987-1989	0.078	Yes	2	482,671	05
Youngstown-Warren-Sharon, OH-PA	PA	Nonattainment	G	Marginal	0.134	1987-1989	0.078	Yes	1	120,293	03
Yuba City, CA	CA	Nonattainment	J	Section 185A	0.120	1987-1989	0.081	Yes	2	114,136	09

¹ See the Air Quality Design Value site spreadsheet footnotes for information about "Insufficient Data" Meets NAAQS Determinations.

Design Values in ppm. "Current Design Values" are current as of the posted Green Book date. Check the Air Quality Design Value site for design value updates.

County subtotals and grand totals may not equal sum of the counties. Part counties are only counted one time within groupings. Multi-state nonattainment areas are counted in totals as maintenance areas when all states in the area have been redesignated. Multi-state areas are counted only once in area totals.

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