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Adjustments to Original 2004 Nonattainment Areas
As of March 30, 2012Thirteen (13) EAC areas were designated attainment on April 15, 2008. Details can be seen here.
| BOUNDARY CHANGE | |
| September 17, 2004 Effective September 13, 2004 | |
| Federal Register ( 69 FR Page 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.'' | |
| CHANGE TO A LOWER CLASSIFICATION | |
| September 22, 2004 Effective November 22, 2004 | |
| Federal Register ( 69 FR Page 56697 ) | |
| Detroit-Ann Arbor, MI - MICHIGAN | |
| Reclassify from Moderate to Marginal | |
| September 22, 2004 Effective November 22, 2004 | |
| Federal Register ( 69 FR Page 56697 ) | |
| Kent and Queen Anne's Cos, MD - MARYLAND | |
| Reclassify from Moderate to Marginal | |
| September 22, 2004 Effective November 22, 2004 | |
| Federal Register ( 69 FR Page 56697 ) | |
| Lancaster, PA - PENNSYLVANIA | |
| Reclassify from Moderate to Marginal | |
| September 22, 2004 Effective November 22, 2004 | |
| Federal Register ( 69 FR Page 56697 ) | |
| Memphis, TN-AR - ARKANSAS | |
| Reclassify from Moderate to Marginal | |
| September 22, 2004 Effective November 22, 2004 | |
| Federal Register ( 69 FR Page 56697 ) | |
| Memphis, TN-AR - TENNESSEE | |
| Reclassify from Moderate to Marginal | |
| September 22, 2004 Effective November 22, 2004 | |
| Federal Register ( 69 FR Page 56697 ) | |
| Muskegon, MI - MICHIGAN | |
| Reclassify from Moderate to Marginal | |
| September 22, 2004 Effective November 22, 2004 | |
| Federal Register ( 69 FR Page 56697 ) | |
| Richmond-Petersburg, VA - VIRGINIA | |
| Reclassify from Moderate to Marginal | |
| September 22, 2004 Effective November 22, 2004 | |
| Federal Register ( 69 FR Page 56697 ) | |
| La Porte, IN - INDIANA | |
| Reclassify from Moderate to Marginal | |
| September 22, 2004 Effective November 22, 2004 | |
| Federal Register ( 69 FR Page 56697 ) | |
| Cass Co, MI - MICHIGAN | |
| Reclassify from Moderate to Marginal | |
| CHANGE TO A HIGHER CLASSIFICATION (BUMP-UPS) | |
| February 13, 2008 Effective March 14, 2008 | |
| Federal Register ( 73 FR Page 8209 ) | |
| Imperial Co, CA - CALIFORNIA | |
| Reclassify from Marginal to Moderate | |
| March 06, 2008 Effective April 07, 2008 | |
| Federal Register ( 73 FR Page 12013 ) | |
| Atlanta, GA - GEORGIA | |
| Reclassify from Marginal to Moderate | |
| March 18, 2008 Effective April 17, 2008 | |
| Federal Register ( 73 FR Page 14391 ) | |
| Beaumont-Port Arthur, TX - TEXAS | |
| Reclassify from Marginal to Moderate | |
| March 21, 2008 Effective April 21, 2008 | |
| Federal Register ( 73 FR Page 15087 ) | |
| Baton Rouge, LA - LOUISIANA | |
| Reclassify from Marginal to Moderate | |
| March 28, 2008 Effective April 28, 2008 | |
| Federal Register ( 73 FR Page 16547 ) | |
| Memphis, TN-AR - ARKANSAS | |
| Reclassify from Marginal to Moderate | |
| March 28, 2008 Effective April 28, 2008 | |
| Federal Register ( 73 FR Page 16547 ) | |
| Memphis, TN-AR - TENNESSEE | |
| Reclassify from Marginal to Moderate | |
| May 20, 2008 Effective June 19, 2008 | |
| Federal Register ( 73 FR Page 29073 ) | |
| Ventura Co, CA - CALIFORNIA | |
| Reclassify from Moderate to Serious | |
| October 01, 2008 Effective October 31, 2008 | |
| Federal Register ( 73 FR Page 56983 ) | |
| Houston-Galveston-Brazoria, TX - TEXAS | |
| Reclassify from Moderate to Severe-15 | |
| May 05, 2010 Effective June 04, 2010 | |
| Federal Register ( 75 FR Page 24409 ) | |
| Los Angeles South Coast Air Basin, CA - CALIFORNIA | |
| Reclassify from Severe-17 to Extreme | |
| May 05, 2010 Effective June 04, 2010 | |
| Federal Register ( 75 FR Page 24409 ) | |
| Riverside Co, (Coachella Valley), CA - CALIFORNIA | |
| Reclassify from Serious to Severe-15 | |
| May 05, 2010 Effective June 04, 2010 | |
| Federal Register ( 75 FR Page 24409 ) | |
| Sacramento Metro, CA - CALIFORNIA | |
| Reclassify from Serious to Severe-15 | |
| May 05, 2010 Effective June 04, 2010 | |
| Federal Register ( 75 FR Page 24409 ) | |
| San Joaquin Valley, CA - CALIFORNIA | |
| Reclassify from Serious to Extreme | |
| December 20, 2010 Effective January 19, 2011 | |
| Federal Register ( 75 FR Page 79302 ) | |
| Dallas-Fort Worth, TX - TEXAS | |
| Reclassify from Moderate to Serious | |
| February 01, 2012 Effective March 02, 2012 | |
| Federal Register ( 77 FR Page 4901 ) | |
| Baltimore, MD - MARYLAND | |
| Reclassify from Moderate to Serious | |
| DESIGNATION TO NONATTAINMENT | |
| April 02, 2008 Effective April 15, 2008 | |
| Federal Register ( 73 FR Page 17897 ) | |
| Denver-Boulder-Greeley-Ft Collins-Love., CO - COLORADO | |