8-Hour Ozone Nonattainment Areas

As of November 13, 2009

8-Hr Ozone classified area designations for the 1997 standard were effective on June 15, 2004. Thirteen (13) 8-Hr EAC areas were designated attainment on April 15, 2008.

On June 8, 2007, the United States Court of Appeals vacated the Subpart 1 portion of the Phase 1 Rule (Court Order). The Subpart 1 areas in the Greenbook are listed as "Former Subpart 1" until reclassification of the areas is finalized. Proposed reclassifications were published on January 16, 2009 (74 FR 2936).

* Design values for 2001-2003 period.

View Notes

Areas Listed Alphabetically	8-hr* Design Value (ppm)	1-hr* Design Value (ppm)	Category/ Classification	2000 Pop.	No. of 8-Hr Counties	No. of 1-Hr** Counties	EPA Region	State
Albany-Schenectady-Troy, NY	0.087	0.115	Former Subpart 1	923,778	7	6	2	NY
Allegan Co, MI	0.097	0.115	Former Subpart 1	105,665	1	1	5	MI
Amador and Calaveras Cos (Central Mtn), CA	0.091	0.117	Former Subpart 1	75,654	2	0	9	CA
Atlanta, GA	0.091	0.125	Moderate	4,228,492	20	13	4	GA
Baltimore, MD	0.103	0.143	Moderate	2,512,431	6	6	3	MD
Baton Rouge, LA	0.086	0.131	Moderate	636,214	5	5	6	LA
Beaumont-Port Arthur, TX	0.091	0.129	Moderate	385,090	3	3	6	TX
Boston-Lawrence-Worcester (E. MA), MA	0.095	0.124	Moderate	5,534,130	10	10	1	MA
Boston-Manchester-Portsmouth(SE),NH	0.095	0.124	Moderate	696,713	4	4	1	NH
Buffalo-Niagara Falls, NY	0.099	0.116	Former Subpart 1	1,170,111	2	2	2	NY
Charlotte-Gastonia-Rock Hill, NC-SC	0.100	0.129	Moderate	1,476,564	8	2	4	NC-SC
Chicago-Gary-Lake County, IL-IN	0.101	0.134	Moderate	8,757,808	10	10	5	IL-IN
Chico, CA	0.089	0.102	Former Subpart 1	203,171	1	1	9	CA
Cincinnati-Hamilton, OH-KY-IN	0.096	0.118	Former Subpart 1	1,891,518	9	8	4 5	OH-KY-IN
Dallas-Fort Worth, TX	0.100	0.135	Moderate	5,030,828	9	4	6	TX
Denver-Boulder-Greeley-Ft Collins-Love., CO	0.087	0.114	Former Subpart 1	2,811,580	9	7	8	CO
Door Co, WI	0.094	0.113	Former Subpart 1	27,961	1	1	5	WI
Essex Co (Whiteface Mtn), NY	0.091	0.113	Former Subpart 1	1,000	1	1	2	NY
Greater Connecticut, CT	0.095	0.139	Moderate	1,543,919	5	5	1	CT
Haywood and Swain Cos (Great Smoky NP), NC	0.085	0.104	Former Subpart 1	288	2	0	4	NC
Houston-Galveston-Brazoria, TX	0.102	0.175	Severe-15	4,669,571	8	8	6	TX
Imperial Co, CA	0.087	0.142	Moderate	142,361	1	1	9	CA
Jamestown, NY	0.094	0.115	Former Subpart 1	139,750	1	0	2	NY
Jefferson Co, NY	0.097	0.121	Moderate	111,738	1	1	2	NY
Kern Co (Eastern Kern), CA	0.098	0.118	Former Subpart 1	99,251	1	1	9	CA
Knoxville, TN	0.092	0.114	Former Subpart 1	713,755	7	1	4	TN
Las Vegas, NV	0.086	0.107	Former Subpart 1	1,348,864	1	0	9	NV
Los Angeles South Coast Air Basin, CA	0.131	0.180	Severe 17	14,593,587	4	4	9	CA
Los Angeles-San Bernardino Cos(W Mojave),CA	0.106	0.138	Moderate	656,408	2	2	9	CA
Manitowoc Co, WI	0.090	0.110	Former Subpart 1	82,887	1	1	5	WI
Mariposa and Tuolumne Cos (Southern Mtn),CA	0.091	0.113	Former Subpart 1	71,631	2	0	9	CA
Memphis, TN-AR	0.092	0.126	Moderate	948,338	2	1	4 6	TN-AR
Milwaukee-Racine, WI	0.101	0.134	Moderate	1,839,149	6	6	5	WI
Nevada Co. (Western Part), CA	0.098	0.116	Former Subpart 1	77,735	1	0	9	CA
New York-N. New Jersey-Long Island,NY-NJ-CT	0.102	0.146	Moderate	19,634,122	24	24	2 1	NY-NJ-CT
Philadelphia-Wilmin-Atlantic Ci,PA-NJ-MD-DE	0.106	0.145	Moderate	7,333,475	18	18	2 3	PA-NJ-MD-DE
Phoenix-Mesa, AZ	0.087	0.111	Former Subpart 1	3,086,045	2	1	9	AZ
Pittsburgh-Beaver Valley, PA	0.094	0.120	Former Subpart 1	2,431,087	7	7	3	PA
Poughkeepsie, NY	0.094	0.126	Moderate	717,262	3	3	2	NY
Providence (All RI), RI	0.095	0.130	Moderate	1,048,319	5	5	1	RI
Riverside Co, (Coachella Valley), CA	0.108	0.133	Serious	324,750	1	1	9	CA
Rochester, NY	0.088	0.110	Former Subpart 1	1,098,201	6	0	2	NY
Sacramento Metro, CA	0.107	0.143	Serious	1,978,348	6	6	9	CA
San Diego, CA	0.093	0.118	Former Subpart 1	2,813,431	1	1	9	CA
San Francisco Bay Area, CA	0.086	0.123	Marginal	6,541,828	9	9	9	CA
San Joaquin Valley, CA	0.115	0.151	Serious	3,191,367	8	8	9	CA
Sheboygan, WI	0.100	0.124	Moderate	112,646	1	1	5	WI
Springfield (Western MA), MA	0.094	0.132	Moderate	814,967	4	4	1	MA
St Louis, MO-IL	0.092	0.122	Moderate	2,504,603	9	9	5 7	MO-IL
Sutter Co (Sutter Buttes), CA	0.088	0.113	Former Subpart 1	1	1	1	9	CA
Ventura Co, CA	0.095	0.124	Serious	753,197	1	1	9	CA
Washington, DC-MD-VA	0.099	0.140	Moderate	4,452,498	15	15	3	DC-MD-VA

52 Total Areas				122,344,087	268

** The 1-hour ozone standard, as well as designations and classifications for all 1-hour ozone nonattainment and maintenance areas, have been revoked except for the Greensboro, NC, Nashville, TN, and Denver, CO maintenance areas. See details here.
The design value for Boston-Lawrence-Worcester (E. MA), MA was used for the classification of Boston-Manchester-Portsmouth (SE), NH. The design value for Washington, DC-MD-VA was used for the classification

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