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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Data is current as of February 28, 2021The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).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 - CALIFORNIA |
April 03, 2015, Effective April 03, 2015 ( 80 FR 18120 ) |
Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation - 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 |
October 13, 2006, Effective October 13, 2006 ( 71 FR 60429 ) |
Macon, GA - GEORGIA |
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 Co, MI - MICHIGAN |
September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
Detroit-Ann Arbor, MI - MICHIGAN |
September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
Kent and Queen Anne's Cos, MD - MARYLAND |
September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
La Porte Co., IN - INDIANA |
September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
Lancaster, PA - PENNSYLVANIA |
September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
Memphis, TN-AR - ARKANSAS |
September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
Memphis, TN-AR - TENNESSEE |
September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
Muskegon, MI - MICHIGAN |
September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 ) |
Richmond-Petersburg, VA - VIRGINIA |
CHANGE FROM SUBPART 1 TO SUBPART 2 |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Albany-Schenectady-Troy, NY - NEW YORK |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Amador and Calaveras Cos. (Central Mountain Cos.), CA - CALIFORNIA |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Buffalo-Niagara Falls, NY - NEW YORK |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Chico, CA - CALIFORNIA |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - COLORADO |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Essex Co (Whiteface Mtn), NY - NEW YORK |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Jamestown, NY - NEW YORK |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Kern Co (Eastern Kern), CA - CALIFORNIA |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Las Vegas, NV - NEVADA |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Mariposa and Tuolumne Cos (Southern Mtn), CA - CALIFORNIA |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Nevada Co. (Western part), CA - CALIFORNIA |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Phoenix-Mesa, AZ - ARIZONA |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Pittsburgh-Beaver Valley, PA - PENNSYLVANIA |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Rochester, NY - NEW YORK |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
San Diego, CA - CALIFORNIA |
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 ) |
Sutter Co (Sutter Buttes), CA - CALIFORNIA |
CHANGE TO A HIGHER CLASSIFICATION (BUMP-UPS) |
February 13, 2008, Effective March 14, 2008 ( 73 FR 8209 ) |
Imperial Co, CA - CALIFORNIA |
March 06, 2008, Effective April 07, 2008 ( 73 FR 12013 ) |
Atlanta, GA - GEORGIA |
March 18, 2008, Effective April 17, 2008 ( 73 FR 14391 ) |
Beaumont-Port Arthur, TX - TEXAS |
March 21, 2008, Effective April 21, 2008 ( 73 FR 15087 ) |
Baton Rouge, LA - LOUISIANA |
March 28, 2008, Effective April 28, 2008 ( 73 FR 16547 ) |
Memphis, TN-AR - ARKANSAS |
March 28, 2008, Effective April 28, 2008 ( 73 FR 16547 ) |
Memphis, TN-AR - TENNESSEE |
May 20, 2008, Effective June 19, 2008 ( 73 FR 29073 ) |
Ventura Co, CA - CALIFORNIA |
October 01, 2008, Effective October 31, 2008 ( 73 FR 56983 ) |
Houston-Galveston-Brazoria, TX - TEXAS |
May 05, 2010, Effective June 04, 2010 ( 75 FR 24409 ) |
Los Angeles-South Coast Air Basin, CA - CALIFORNIA |
May 05, 2010, Effective June 04, 2010 ( 75 FR 24409 ) |
Riverside Co. (Coachella Valley), CA - CALIFORNIA |
May 05, 2010, Effective June 04, 2010 ( 75 FR 24409 ) |
Sacramento Metro, CA - CALIFORNIA |
May 05, 2010, Effective June 04, 2010 ( 75 FR 24409 ) |
San Joaquin Valley, CA - CALIFORNIA |
December 20, 2010, Effective January 19, 2011 ( 75 FR 79302 ) |
Dallas-Fort Worth, TX - TEXAS |
February 01, 2012, Effective March 02, 2012 ( 77 FR 4901 ) |
Baltimore, MD - MARYLAND |
May 08, 2012, Effective June 07, 2012 ( 77 FR 26950 ) |
Los Angeles-San Bernardino Cos. (W Mojave Desert), CA - CALIFORNIA |
July 10, 2019, Effective July 10, 2019 ( 84 FR 32841 ) |
Riverside Co. (Coachella Valley), CA - CALIFORNIA |
DESIGNATION TO NONATTAINMENT |
April 02, 2008, Effective April 15, 2008 ( 73 FR 17897 ) |
Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - COLORADO |