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Adjustments to Original 8-Hour Ozone (1997) Nonattainment Area Baseline
Adjustments to Original 8-Hour Ozone (1997) Nonattainment Area Baseline
Data is current as of November 30, 2023The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264). Thirteen (13) EAC areas were designated attainment on April 15, 2008. Details can be seen here.
| AREA SPLIT |
| September 23, 2013, Effective October 23, 2013 ( 78 FR 58189 ) |
| Los Angeles-South Coast Air Basin, CA - CALIFORNIA |
| September 23, 2013, Effective October 23, 2013 ( 78 FR 58189 ) |
| Morongo Band of Mission Indians, CA - CALIFORNIA |
| April 03, 2015, Effective April 03, 2015 ( 80 FR 18120 ) |
| Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, CA - CALIFORNIA |
| July 15, 2019, Effective July 15, 2019 ( 84 FR 33699 ) |
| Inland Sheboygan County, WI - WISCONSIN |
| July 15, 2019, Effective July 15, 2019 ( 84 FR 33699 ) |
| Shoreline Sheboygan County, WI - WISCONSIN |
| BOUNDARY CHANGE |
| September 17, 2004, Effective September 13, 2004 ( 69 FR 55956 ) |
| Las Vegas, NV - NEVADA |
| The revised designation defines a smaller nonattainment area around the City of Las Vegas and designates the remainder of Clark County with the rest of the State as ``unclassifiable/attainment.'' |
| October 13, 2006, Effective October 13, 2006 ( 71 FR 60429 ) |
| Macon, GA - GEORGIA |
| This action corrects the 8-hour ozone nonattainment boundary for Monroe County, Georgia by deleting a highway from the boundary description, and clarifies the 8-hour ozone nonattainment boundary for Murray County, Georgia by adding a boundary description. |
| April 03, 2015, Effective April 03, 2015 ( 80 FR 18120 ) |
| Los Angeles-South Coast Air Basin, CA - CALIFORNIA |
| April 03, 2015, Effective April 03, 2015 ( 80 FR 18120 ) |
| San Diego, CA - CALIFORNIA |
| CHANGE TO A LOWER CLASSIFICATION |
| September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
| Cass County, MI - MICHIGAN |
| Reclassify from Moderate to Marginal |
| September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
| Detroit-Ann Arbor, MI - MICHIGAN |
| Reclassify from Moderate to Marginal |
| September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
| Kent and Queen Anne's Counties, MD - MARYLAND |
| Reclassify from Moderate to Marginal |
| September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
| La Porte County, IN - INDIANA |
| Reclassify from Moderate to Marginal |
| September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
| Lancaster, PA - PENNSYLVANIA |
| Reclassify from Moderate to Marginal |
| September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
| Memphis, TN-AR - ARKANSAS |
| Reclassify from Moderate to Marginal |
| September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
| Memphis, TN-AR - TENNESSEE |
| Reclassify from Moderate to Marginal |
| September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
| Muskegon, MI - MICHIGAN |
| Reclassify from Moderate to Marginal |
| September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
| Richmond-Petersburg, VA - VIRGINIA |
| Reclassify from Moderate to Marginal |
| CHANGE FROM SUBPART 1 TO SUBPART 2 |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Albany-Schenectady-Troy, NY - NEW YORK |
| Change from Former Subpart 1 to Marginal |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Amador and Calaveras Cos. (Central Mountain Cos.), CA - CALIFORNIA |
| Change from Former Subpart 1 to Moderate |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Buffalo-Niagara Falls, NY - NEW YORK |
| Change from Former Subpart 1 to Moderate |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Chico, CA - CALIFORNIA |
| Change from Former Subpart 1 to Marginal |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - COLORADO |
| Change from Former Subpart 1 to Marginal |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Essex County (Whiteface Mtn.), NY - NEW YORK |
| Change from Former Subpart 1 to Marginal |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Jamestown, NY - NEW YORK |
| Change from Former Subpart 1 to Moderate |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Kern County (Eastern Kern), CA - CALIFORNIA |
| Change from Former Subpart 1 to Moderate |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Las Vegas, NV - NEVADA |
| Change from Former Subpart 1 to Marginal |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Mariposa and Tuolumne Cos. (Southern Mountain Counties), CA - CALIFORNIA |
| Change from Former Subpart 1 to Moderate |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Nevada County (Western part), CA - CALIFORNIA |
| Change from Former Subpart 1 to Moderate |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Phoenix-Mesa, AZ - ARIZONA |
| Change from Former Subpart 1 to Marginal |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Pittsburgh-Beaver Valley, PA - PENNSYLVANIA |
| Change from Former Subpart 1 to Moderate |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Rochester, NY - NEW YORK |
| Change from Former Subpart 1 to Marginal |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| San Diego, CA - CALIFORNIA |
| Change from Former Subpart 1 to Moderate |
| May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
| Sutter County (part) (Sutter Buttes), CA - CALIFORNIA |
| Change from Former Subpart 1 to Marginal |
| CHANGE TO A HIGHER CLASSIFICATION (BUMP-UPS) |
| February 13, 2008, Effective March 14, 2008 ( 73 FR 8209 ) |
| Imperial County, CA - CALIFORNIA |
| Reclassify from Marginal to Moderate |
| March 06, 2008, Effective April 07, 2008 ( 73 FR 12013 ) |
| Atlanta, GA - GEORGIA |
| Reclassify from Marginal to Moderate |
| March 18, 2008, Effective April 17, 2008 ( 73 FR 14391 ) |
| Beaumont-Port Arthur, TX - TEXAS |
| Reclassify from Marginal to Moderate |
| March 21, 2008, Effective April 21, 2008 ( 73 FR 15087 ) |
| Baton Rouge, LA - LOUISIANA |
| Reclassify from Marginal to Moderate |
| March 28, 2008, Effective April 28, 2008 ( 73 FR 16547 ) |
| Memphis, TN-AR - ARKANSAS |
| Reclassify from Marginal to Moderate |
| March 28, 2008, Effective April 28, 2008 ( 73 FR 16547 ) |
| Memphis, TN-AR - TENNESSEE |
| Reclassify from Marginal to Moderate |
| May 20, 2008, Effective June 19, 2008 ( 73 FR 29073 ) |
| Ventura County (part), CA - CALIFORNIA |
| Reclassify from Moderate to Serious |
| October 01, 2008, Effective October 31, 2008 ( 73 FR 56983 ) |
| Houston-Galveston-Brazoria, TX - TEXAS |
| Reclassify from Moderate to Severe-15 |
| May 05, 2010, Effective June 04, 2010 ( 75 FR 24409 ) |
| Los Angeles-South Coast Air Basin, CA - CALIFORNIA |
| Reclassify from Severe-17 to Extreme |
| May 05, 2010, Effective June 04, 2010 ( 75 FR 24409 ) |
| Riverside County (Coachella Valley), CA - CALIFORNIA |
| Reclassify from Serious to Severe-15 |
| May 05, 2010, Effective June 04, 2010 ( 75 FR 24409 ) |
| Sacramento Metro, CA - CALIFORNIA |
| Reclassify from Serious to Severe-15 |
| May 05, 2010, Effective June 04, 2010 ( 75 FR 24409 ) |
| San Joaquin Valley, CA - CALIFORNIA |
| Reclassify from Serious to Extreme |
| December 20, 2010, Effective January 19, 2011 ( 75 FR 79302 ) |
| Dallas-Fort Worth, TX - TEXAS |
| Reclassify from Moderate to Serious |
| February 01, 2012, Effective March 02, 2012 ( 77 FR 4901 ) |
| Baltimore, MD - MARYLAND |
| Reclassify from Moderate to Serious |
| May 08, 2012, Effective June 07, 2012 ( 77 FR 26950 ) |
| Los Angeles and San Bernardino Counties (Western Mojave Desert), CA - CALIFORNIA |
| Reclassify from Moderate to Severe-15 |
| July 10, 2019, Effective July 10, 2019 ( 84 FR 32841 ) |
| Riverside County (Coachella Valley), CA - CALIFORNIA |
| Reclassify from Severe 15 to Extreme |
| DESIGNATION TO NONATTAINMENT |
| April 02, 2008, Effective April 15, 2008 ( 73 FR 17897 ) |
| Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - COLORADO |