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Adjustments to Original 8-Hour Ozone (1997) Nonattainment Area Baseline

Data is current as of September 30, 2017


The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).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
 
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 Co, 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 Cos, MD - MARYLAND
Reclassify from Moderate to Marginal
 
September 22, 2004, Effective November 22, 2004 ( 69 FR 56697 )
La Porte Co., 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 Co (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 Co (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 Mtn), CA - CALIFORNIA
Change from Former Subpart 1 to Moderate
 
May 14, 2012, Effective June 13, 2012 ( 77 FR 28424 )
Nevada Co. (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 Co (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 Co, 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 Co, 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 Co. (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-San Bernardino Cos. (W Mojave Desert), CA - CALIFORNIA
Reclassify from Moderate to Severe-15
 
DESIGNATION TO NONATTAINMENT
April 02, 2008, Effective April 15, 2008 ( 73 FR 17897 )
Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - COLORADO