8-Hour Ozone (1997) Nonattainment Areas

As of December 14, 2012
View Notes
Current and historical design value data can be found at http://www.epa.gov/airtrends/values.html

Areas Listed Alphabetically	Design Values (2001-2003) (ppm)		Classification	No. Counties NAA	2010 Population	EPA Region	State
Areas Listed Alphabetically	8-Hr	1-Hr	Classification	No. Counties NAA	2010 Population	EPA Region	State
Albany-Schenectady-Troy, NY	0.087	0.115	Marginal	7	970,156	2	NY
Amador and Calaveras Cos (Central Mtn), CA	0.091	0.117	Moderate	2	83,669	9	CA
Atlanta, GA	0.091	0.125	Moderate	20	5,260,436	4	GA
Baltimore, MD	0.103	0.143	Serious	6	2,662,691	3	MD
Boston-Lawrence-Worcester (E. MA), MA	0.095	0.124	Moderate	10	5,723,468	1	MA
Boston-Manchester-Portsmouth (SE), NH	0.095	0.124	Moderate	4	740,556	1	NH
Buffalo-Niagara Falls, NY	0.099	0.116	Moderate	2	1,135,509	2	NY
Charlotte-Gastonia-Rock Hill, NC-SC	0.100	0.129	Moderate	8	1,968,712	4	NC-SC
Chico, CA	0.089	0.102	Marginal	1	220,000	9	CA
Dallas-Fort Worth, TX	0.100	0.135	Serious	9	6,221,286	6	TX
Denver-Boulder-Greeley-Ft Collins-Loveland, CO	0.087	0.114	Marginal	9	3,330,139	8	CO
Essex Co (Whiteface Mtn), NY	0.091	0.113	Marginal	1	465	2	NY
Greater Connecticut, CT	0.095	0.139	Moderate	5	1,629,115	1	CT
Houston-Galveston-Brazoria, TX	0.102	0.175	Severe 15	8	5,891,999	6	TX
Imperial Co, CA	0.087	0.142	Moderate	1	174,528	9	CA
Jamestown, NY	0.094	0.115	Moderate	1	134,905	2	NY
Jefferson Co, NY	0.097	0.121	Moderate	1	116,229	2	NY
Kern Co (Eastern Kern), CA	0.098	0.118	Moderate	1	95,314	9	CA
Las Vegas, NV	0.086	0.107	Marginal	1	1,918,819	9	NV
Los Angeles South Coast Air Basin, CA	0.131	0.180	Extreme	4	15,718,827	9	CA
Los Angeles-San Bernardino Cos. (W Mojave Desert), CA	0.106	0.138	Severe 15	2	868,350	9	CA
Mariposa and Tuolumne Cos (Southern Mtn), CA	0.091	0.113	Moderate	2	73,616	9	CA
Nevada Co. (Western Part), CA	0.098	0.116	Moderate	1	82,393	9	CA
New York-N. New Jersey-Long Island, NY-NJ-CT	0.102	0.146	Moderate	24	20,217,137	2 1	NY-NJ-CT
Philadelphia-Wilmin-Atlantic City, PA-NJ-MD-DE	0.106	0.145	Moderate	18	7,796,590	2 3	PA-NJ-MD-DE
Phoenix-Mesa, AZ	0.087	0.111	Marginal	2	3,848,627	9	AZ
Pittsburgh-Beaver Valley, PA	0.094	0.120	Moderate	7	2,356,285	3	PA
Poughkeepsie, NY	0.094	0.126	Moderate	3	770,011	2	NY
Providence (All RI), RI	0.095	0.130	Moderate	5	1,052,567	1	RI
Riverside Co, (Coachella Valley), CA	0.108	0.133	Severe 15	1	425,425	9	CA
Rochester, NY	0.088	0.110	Marginal	6	1,114,402	2	NY
Sacramento Metro, CA	0.107	0.143	Severe 15	6	2,243,911	9	CA
San Diego, CA	0.093	0.118	Moderate	1	3,093,459	9	CA
San Francisco Bay Area, CA	0.086	0.123	Marginal	9	6,970,997	9	CA
San Joaquin Valley, CA	0.115	0.151	Extreme	8	3,842,586	9	CA
Sheboygan, WI	0.100	0.124	Moderate	1	115,507	5	WI
Springfield (Western MA), MA	0.094	0.132	Moderate	4	824,161	1	MA
St Louis, MO-IL	0.092	0.122	Moderate	9	2,594,238	5 7	MO-IL
Sutter Co (Sutter Buttes), CA	0.088	0.113	Marginal	1	33	9	CA
Ventura Co, CA	0.095	0.124	Serious	1	823,360	9	CA
Washington, DC-MD-VA	0.099	0.140	Moderate	15	5,136,216	3	DC-MD-VA

41 Total Areas				221	118,246,694

Notes:

'Split' in the No. Ctys column indicates that the multi-state area has states that have been redesignated but the area does not become a maintenance area until all states in the area are redesignated.

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 of Fredericksburg, VA.

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) (PDF). On May 14, 2012, the Former Subpart 1 nonattainment areas were classified under Subpart 2 (77 FR 28424 (PDF)), effective June 13, 2012.

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8-Hour Ozone (1997) Nonattainment Areas

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