8-Hour Ozone (1997) Federal Register Notice Classification Changes - NAAQS Revoked

Data is current as of September 30, 2023
Previous Ordered by Classification
The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).

Click on the 'FR' link to view the Federal Register Notice

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EXTREME
Los Angeles-South Coast Air Basin, CA
Reclassify from Severe-17 to Extreme
Proposed Approval	08/27/2009	74 FR 43654
Final Approval	05/05/2010	75 FR 24409	Effective: 06/04/2010
Riverside County (Coachella Valley), CA
Reclassify from Serious to Severe-15
Proposed Approval	08/27/2009	74 FR 43654
Final Approval	05/05/2010	75 FR 24409	Effective: 06/04/2010
Reclassify from Severe 15 to Extreme
Final Approval	07/10/2019	84 FR 32841	Effective: 07/10/2019
San Joaquin Valley, CA
Reclassify from Serious to Extreme
Proposed Approval	08/27/2009	74 FR 43654
Final Approval	05/05/2010	75 FR 24409	Effective: 06/04/2010
SEVERE 17
Morongo Band of Mission Indians, CA
Reclassify from Severe-17 to Extreme
Proposed Approval	08/27/2009	74 FR 43654
Withdrawal	09/23/2013	78 FR 58266	Effective: 09/23/2013
Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, CA
Reclassify from Severe-17 to Extreme
Proposed Approval	08/27/2009	74 FR 43654
Withdrawal	04/03/2015	80 FR 18184	Effective: 04/03/2015
SEVERE 15
Houston-Galveston-Brazoria, TX
Reclassify from Moderate to Severe-15
Proposed Approval	12/31/2007	72 FR 74252
Final Approval	10/01/2008	73 FR 56983	Effective: 10/31/2008
Los Angeles and San Bernardino Counties (Western Mojave Desert), CA
Reclassify from Moderate to Severe-15
Final Approval	05/08/2012	77 FR 26950	Effective: 06/07/2012
Sacramento Metro, CA
Reclassify from Serious to Severe-15
Proposed Approval	08/27/2009	74 FR 43654
Final Approval	05/05/2010	75 FR 24409	Effective: 06/04/2010
SERIOUS
Baltimore, MD
Reclassify from Moderate to Serious
Proposed Approval	09/01/2011	76 FR 54412
Final Approval	02/01/2012	77 FR 4901	Effective: 03/02/2012
Dallas-Fort Worth, TX
Reclassify from Moderate to Serious
Proposed Approval	08/09/2010	75 FR 47746
Final Approval	12/20/2010	75 FR 79302	Effective: 01/19/2011
Reclassify from Serious to Severe-15
Proposed Approval	02/17/2015	80 FR 8274
Ventura County (part), CA
Reclassify from Moderate to Serious
Final Approval	05/20/2008	73 FR 29073	Effective: 06/19/2008
MODERATE
Amador and Calaveras Cos. (Central Mountain Cos.), CA
Change from Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Atlanta, GA
Reclassify from Marginal to Moderate
Proposed Approval	10/16/2007	72 FR 58572
Final Approval	03/06/2008	73 FR 12013	Effective: 04/07/2008
Baton Rouge, LA
Reclassify from Marginal to Moderate
Proposed Approval	10/30/2007	72 FR 61315
Final Approval	03/21/2008	73 FR 15087	Effective: 04/21/2008
Beaumont-Port Arthur, TX
Reclassify from Marginal to Moderate
Proposed Approval	10/30/2007	72 FR 61310
Final Approval	03/18/2008	73 FR 14391	Effective: 04/17/2008
Buffalo-Niagara Falls, NY
Change from Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Imperial County, CA
Reclassify from Marginal to Moderate
Proposed Approval	11/23/2007	72 FR 65682
Final Approval	02/13/2008	73 FR 8209	Effective: 03/14/2008
Jamestown, NY
Change from Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Kern County (Eastern Kern), CA
Change from Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Mariposa and Tuolumne Cos. (Southern Mountain Counties), CA
Change from Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Memphis, TN-AR
Reclassify from Moderate to Marginal
Final Approval	09/22/2004	69 FR 56697	Effective: 11/22/2004
Reclassify from Marginal to Moderate
Proposed Approval	10/16/2007	72 FR 58577
Final Approval	03/28/2008	73 FR 16547	Effective: 04/28/2008
Nevada County (Western part), CA
Change from Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Pittsburgh-Beaver Valley, PA
Change from Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
San Diego, CA
Change from Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
MARGINAL
Albany-Schenectady-Troy, NY
Change from Former Subpart 1 to Marginal
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Cass County, MI
Reclassify from Moderate to Marginal
Final Approval	09/22/2004	69 FR 56697	Effective: 11/22/2004
Chico, CA
Change from Former Subpart 1 to Marginal
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Denver-Boulder-Greeley-Ft. Collins-Loveland, CO
Change from Former Subpart 1 to Marginal
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Detroit-Ann Arbor, MI
Reclassify from Moderate to Marginal
Final Approval	09/22/2004	69 FR 56697	Effective: 11/22/2004
Essex County (Whiteface Mtn.), NY
Change from Former Subpart 1 to Marginal
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Kent and Queen Anne's Counties, MD
Reclassify from Moderate to Marginal
Final Approval	09/22/2004	69 FR 56697	Effective: 11/22/2004
La Porte County, IN
Reclassify from Moderate to Marginal
Final Approval	09/22/2004	69 FR 56697	Effective: 11/22/2004
Lancaster, PA
Reclassify from Moderate to Marginal
Final Approval	09/22/2004	69 FR 56697	Effective: 11/22/2004
Las Vegas, NV
Change from Former Subpart 1 to Marginal
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Muskegon, MI
Reclassify from Moderate to Marginal
Final Approval	09/22/2004	69 FR 56697	Effective: 11/22/2004
Phoenix-Mesa, AZ
Change from Former Subpart 1 to Marginal
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Richmond-Petersburg, VA
Reclassify from Moderate to Marginal
Final Approval	09/22/2004	69 FR 56697	Effective: 11/22/2004
Rochester, NY
Change from Former Subpart 1 to Marginal
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
Sutter County (part) (Sutter Buttes), CA
Change from Former Subpart 1 to Marginal
Proposed Approval	01/16/2009	74 FR 2936
Final Approval	05/14/2012	77 FR 28424	Effective: 06/13/2012
FORMER SUBPART 1
Allegan County, MI
From Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Cincinnati-Hamilton, OH-KY-IN
From Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Clearfield and Indiana Counties, PA
From Former Subpart 1 to Marginal
Proposed Approval	01/16/2009	74 FR 2936
Columbus, OH
From Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Door County, WI
From Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Greene County, PA
From Former Subpart 1 to Marginal
Proposed Approval	01/16/2009	74 FR 2936
Haywood and Swain Counties (Great Smoky NP), NC
From Former Subpart 1 to Marginal
Proposed Approval	01/16/2009	74 FR 2936
Knoxville, TN
From Former Subpart 1 to Moderate
Proposed Approval	01/16/2009	74 FR 2936
Manitowoc County, WI
From Former Subpart 1 to Marginal
Proposed Approval	01/16/2009	74 FR 2936

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