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Ozone (2008) NAAQS Nonattainment Areas with Prior Ozone NAAQS as of April 6, 2015

See: List Updated for Current Actions
The 8-Hour Ozone (1997) NAAQS was revoked effective April 6, 2015. The 1-Hour Ozone (1979) NAAQS was revoked on June 15, 2005.

	8-Hour Ozone (2008)	8-Hour Ozone (1997)		1-Hour Ozone (1979)
2008 Nonattainment Area Name	Classification	Classification	Attainment Determination	Classification	Attainment Determination
Baltimore Area, MD	Moderate	Serious	No Action	Severe-15	Clean Data Determination
Calaveras County, CA ¹	Marginal	Moderate	Clean Data Determination,Attainment Deadline Determination	n/a	n/a
Chico Area, CA	Marginal	Marginal	Clean Data Determination, Attainment Deadline Determination	n/a	n/a
Dallas-Fort Worth Area, TX ¹	Moderate	Serious	No Action	Serious	Clean Data Determination
Denver-Boulder-Greeley-Ft. Collins-Loveland Area, CO	Marginal	Marginal	No Action	n/a	n/a
Dukes County, MA ¹	Marginal	Moderate	Clean Data Determination, Attainment Deadline Determination	Serious	Clean Data Determination, Attainment Deadline Determination
Greater Connecticut Area, CT	Marginal	Moderate	Clean Data Determination, Attainment Deadline Determination	Serious	Clean Data Determination
Houston-Galveston-Brazoria Area, TX	Marginal	Severe-15	No Action	Severe-17	No Action
Imperial County Area, CA	Marginal	Moderate	Clean Data Determination	n/a	n/a
Jamestown Area, NY	Marginal	Moderate	Clean Data Determination ²	n/a	n/a
Kern County (Eastern Kern) Area, CA	Marginal	Moderate	Clean Data Determination, Attainment Deadline Determination	n/a	n/a
Los Angeles and San Bernardino Counties (W Mojave Desert) Area, CA	Severe-15	Severe-15	No Action	Severe-17	No Action
Los Angeles-South Coast Air Basin Area, CA	Extreme	Extreme	No Action	Extreme	No Action
Mariposa County, CA ¹	Marginal	Moderate	Clean Data Determination, Attainment Deadline Determination	n/a	n/a
Morongo Areas of Indian Country (Morongo Band of Mission Indians) ³	Serious	Severe-17	No Action	Severe-17	No Action
Nevada County (Western part) Area, CA	Marginal	Moderate	Clean Data Determination, Attainment Deadline Determination	n/a	n/a
New York-N. New Jersey-Long Island Area, NY-NJ-CT	Marginal	Moderate	Attainment Deadline Determination	Severe-17	Clean Data Determination
Pechanga Areas of Indian Country (Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation)⁴	Moderate	Severe-17	No Action	Extreme	No Action
Philadelphia-Wilmington-Atlantic City Area, PA-NJ-MD-DE ¹	Marginal	Moderate	Clean Data Determination, Attainment Deadline Determination	Severe-15	Attainment Deadline Determination
Pittsburgh-Beaver Valley Area, PA	Marginal	Moderate	Clean Data Determination, Attainment Deadline Determination	n/a	n/a
Riverside County (Coachella Valley) Area (1-hr Southeast Desert), CA	Severe-15	Severe-15	No Action	Severe-17	No Action
Sacramento Metro Area, CA	Severe-15	Severe-15	No Action	Severe-15	Clean Data Determination
San Francisco Bay Area, CA	Marginal	Marginal	No Action	Other	Clean Data Determination, Attainment Deadline Determination
San Joaquin Valley Area, CA	Extreme	Extreme	No Action	Extreme	No Action
Seaford, DE ⁵	Marginal	Moderate	Clean Data Determination, Attainment Deadline Determination	Marginal	Clean Data Determination, Attainment Deadline Determination
Sheboygan County, WI	Marginal	Moderate	Clean Data Determination	n/a	n/a
Ventura County (part) Area, CA	Serious	Serious	Clean Data Determination	Severe-15	Clean Data Determination, Attainment Deadline Determination
Washington Area, DC-MD-VA	Marginal	Moderate	Clean Data Determination, Attainment Deadline Determination	Severe-15	Attainment Deadline Determination

¹ 8-Hour Ozone (2008) NAAQS nonattainment area boundary differs from 8-Hour Ozone (1997) and (where applicable) 1-Hour Ozone (1997) NAAQS nonattainment area boundary.

² Former subpart 1 areas with Determinations of Attainment prior to subpart 2 classification on May 14, 2012 (77 FR 28424). An Attainment Deadline Determination for these areas for the 8-Hour Ozone (1997) NAAQS attainment dates is pending with the EPA.

³ Part of Los Angeles-South Coast Air Basin Area, CA (South Coast) for 8-Hour Ozone (1997) and 1-Hour Ozone (1979) nonattainment area boundaries. The EPA published a correction of the classification for the 8-Hour Ozone (1997) and 1-Hour Ozone (1979) NAAQS on September 23, 2013 (78 FR 58189).

⁴ Part of Los Angeles-South Coast Air Basin Area, CA (South Coast) for 8-Hour Ozone (1997) and 1-Hour Ozone (1979) nonattainment area boundaries. The EPA published a correction of the classification for the 8-Hour Ozone (1997) NAAQS on May 5, 2010 (75 FR 24409).

⁵ Part of the Philadelphia-Wilmington-Atlantic City Area, PA, NJ, MD, DE for 8-Hour Ozone (1997) nonattainment area boundary, and part of the Sussex County, DE Ozone nonattainment area boundary for the 1-Hour Ozone (1979) NAAQS.

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