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Ozone (2008) NAAQS Nonattainment Areas with Prior Ozone NAAQS - Updated for Actions Since April 6, 2015

Data is current as of 09/30/2020    |    See: Original April 6, 2015 List
The 1997 Ozone NAAQS was revoked effective April 6, 2015. The 1979 1-Hour Ozone NAAQS was revoked on June 15, 2005.
  8-Hour Ozone (2008) 8-Hour Ozone (1997) 1-Hour Ozone (1979)
2008 Nonattainment Area Name Classification Attainment Determination Classification Attainment
Determination
Classification Attainment Determination
Baltimore Area, MD Moderate Clean Data Determination Serious Clean Data Determination Severe-15 Clean Data Determination
Calaveras County, CA 1 Marginal Attainment Deadline Determination Moderate Clean Data Determination,Attainment Deadline Determination n/a n/a
Chico Area, CA Marginal Attainment Deadline Determination Marginal Clean Data Determination, Attainment Deadline Determination n/a n/a
Dallas-Fort Worth Area, TX 1 Moderate No Action Serious See Footnote 8 Serious See Footnote 9
Denver-Boulder-Greeley-Ft. Collins-Loveland Area, CO Serious No Action Marginal No Action n/a n/a
Dukes County, MA 1 Marginal Attainment Deadline Determination Moderate Clean Data Determination, Attainment Deadline Determination Serious Clean Data Determination, Attainment Deadline Determination
Greater Connecticut Area, CT Moderate Clean Data Determination Moderate Clean Data Determination, Attainment Deadline Determination Serious Clean Data Determination
Houston-Galveston-Brazoria Area, TX Moderate No Action Severe-15 See Footnote 7 Severe-17 See Footnote 6
Imperial County Area, CA Moderate 179B Determination 10 Moderate Clean Data Determination n/a n/a
Inland Sheboygan County, WI Moderate Maintenance Moderate Clean Data Determination n/a n/a
Jamestown Area, NY Marginal Attainment Deadline Determination Moderate Clean Data
Determination 2
n/a n/a
Kern County (Eastern Kern) Area, CA Serious No Action Moderate Clean Data Determination, Attainment Deadline Determination n/a n/a
Los Angeles and San Bernardino Counties (W Mojave Desert) Area, CA Severe-15 No Action Severe-15 No Action Severe-17 No Action
Los Angeles-South Coast Air Basin Area, CA Extreme No Action Extreme No Action Extreme  No Action
Mariposa County, CA 1 Moderate Clean Data Determination Moderate Clean Data Determination, Attainment Deadline Determination n/a n/a
Morongo Areas of Indian Country (Morongo Band of Mission Indians) 3

Serious No Action Severe-17 No Action Severe-17 No Action
Nevada County (Western part) Area, CA Moderate No Action Moderate Clean Data Determination, Attainment Deadline Determination n/a n/a
New York-N. New Jersey-Long Island Area, NY-NJ-CT Moderate No Action Moderate No Action Severe-17 Clean Data Determination
Pechanga Areas of Indian Country (Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation) 4 Moderate No Action Severe-17 No Action Extreme No Action
Philadelphia-Wilmington-Atlantic City Area, PA-NJ-MD-DE 1 Marginal No Action Moderate Clean Data Determination, Attainment Deadline Determination Severe-15 Attainment Deadline Determination
Pittsburgh-Beaver Valley Area, PA Marginal No Action Moderate Clean Data Determination, Attainment Deadline Determination n/a n/a
Riverside County (Coachella Valley) Area (1-hr Southeast Desert), CA Severe-15 No Action Extreme No Action Severe-17 No Action
Sacramento Metro Area, CA Severe-15 No Action Severe-15 No Action Severe-15 Clean Data Determination
San Francisco Bay Area, CA Marginal Attainment Deadline Determination Marginal No Action Other Clean Data Determination, Attainment Deadline Determination
San Joaquin Valley Area, CA Extreme No Action Extreme No Action Extreme Clean Data Determination
Seaford, DE 5 Marginal Attainment Deadline Determination Moderate Clean Data Determination, Attainment Deadline Determination Marginal Clean Data Determination, Attainment Deadline Determination
Shoreline Sheboygan, WI Moderate Maintenance Moderate Clean Data Determination n/a n/a
Ventura County (part) Area, CA Serious No Action Serious Clean Data Determination Severe-15 Clean Data Determination, Attainment Deadline Determination
Washington Area, DC-MD-VA Marginal Maintenance 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.

6 The Houston-Galveston-Brazoria Area was designated and classified as ''Severe-17'' nonattainment on November 15, 1990 and was so designated and classified when the 1-hour ozone standard was revoked. The area has since attained the 1-hour ozone standard and met all the Clean Air Act criteria for redesignation. All 1-hour ozone standard anti-backsliding obligations for the area are terminated effective March 16, 2020. (85 FR 8411)

7 The Houston-Galveston-Brazoria, TX area was designated nonattainment effective June 15, 2004 and was classified as ''Severe-15'' effective October 31, 2008. The area has since attained the 1997 8-hour ozone standard and met all the Clean Air Act criteria for redesignation. All 1997 8-hour ozone standard anti-backsliding obligations for the area are terminated effective March 16, 2020. (85 FR 8411)

8 The Dallas-Fort Worth, TX area was designated and classified as a Moderate nonattainment area effective June 15, 2004. The area was classified as Serious nonattainment effective January 19, 2011. The area has since attained the 1997 ozone standard and met all the Clean Air Act criteria for redesignation. All 1997 8-hour ozone standard anti-backsliding obligations for the area are terminated effective May 6, 2020. (85 FR 19096)

9 The Dallas-Fort Worth Area was designated and classified as Moderate nonattainment on November 15, 1990. The area was classified as Serious nonattainment on March 20, 1998 and was so designated and classified when the 1-hour ozone standard, designations and classifications were revoked. The area has since attained the 1-hour ozone standard and met all the Clean Air Act criteria for redesignation. All 1-hour ozone standard anti-backsliding obligations for the area are terminated effective May 6, 2020. (85 FR 19096)

10 On February 27, 2020, the EPA determined, based on an analysis from California, that the Imperial County nonattainment area would have attained the 2008 ozone NAAQS by the 'Moderate' area attainment date of July 20, 2018, but for emissions emanating from Mexico, and therefore is not subject to the CAA requirements pertaining to reclassification upon failure to attain. (85 FR 11817)


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