8-Hour Ozone (1997) Clean Data Determination/Attainment Determinations For Areas with Current Nonattainment Status - NAAQS Revoked

Data is current as of January 31, 2026
Previous Ordered by Classification, Area Name
The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).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
Riverside County (Coachella Valley), CA
Determination of Attainment by Attainment Date
Proposed Approval	01/15/2026	91 FR 1732
SEVERE 15
Houston-Galveston-Brazoria, TX
Clean Data Determination
Proposed Approval	08/17/2015	80 FR 49187
Final Approval	12/30/2015	80 FR 81466	Effective: 01/29/2016
SERIOUS
Baltimore, MD
Clean Data Determination
Proposed Approval	03/25/2015	80 FR 15711
Final Approval	05/26/2015	80 FR 29970	Effective: 06/25/2015
Dallas-Fort Worth, TX
Clean Data Determination
Proposed Approval	04/28/2015	80 FR 23487
Final Approval	09/01/2015	80 FR 52630	Effective: 10/01/2015
Ventura County (part), CA
Clean Data Determination
Proposed Approval	09/14/2012	77 FR 56797
Direct Final	09/14/2012	77 FR 56775	Effective: 11/13/2012
Withdrawal	11/07/2012	77 FR 66715	Effective: 11/07/2012
Final Approval	12/03/2012	77 FR 71551	Effective: 01/02/2013
Determination of Attainment by Attainment Date
Proposed Approval	10/09/2020	85 FR 64089
Direct Final	10/09/2020	85 FR 64046	Effective: 01/07/2021
Withdrawal	12/09/2020	85 FR 79129	Effective: 12/09/2020
Final Approval	07/29/2021	86 FR 40784	Effective: 08/30/2021
MODERATE
Amador and Calaveras Cos. (Central Mountain Cos.), CA
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	09/14/2012	77 FR 56797
Direct Final	09/14/2012	77 FR 56775	Effective: 11/13/2012
Withdrawal	11/07/2012	77 FR 66715	Effective: 11/07/2012
Final Approval	12/03/2012	77 FR 71551	Effective: 01/02/2013
Boston-Lawrence-Worcester (E. Mass), MA
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	03/13/2012	77 FR 14712
Final Approval	05/29/2012	77 FR 31496	Effective: 06/28/2012
Buffalo-Niagara Falls, NY
Clean Data Determination
Proposed Approval	09/23/2009	74 FR 48498
Final Approval	12/07/2009	74 FR 63993	Effective: 01/06/2010
Determination of Attainment by Attainment Date
Proposed Approval	10/09/2020	85 FR 64089
Direct Final	10/09/2020	85 FR 64046	Effective: 01/07/2021
Withdrawal	12/09/2020	85 FR 79129	Effective: 12/09/2020
Final Approval	07/29/2021	86 FR 40784	Effective: 08/30/2021
Greater Connecticut, CT
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	06/01/2010	75 FR 30310
Final Approval	08/31/2010	75 FR 53219	Effective: 09/30/2010
Imperial County, CA
Clean Data Determination
Proposed Approval	09/23/2009	74 FR 48495
Final Approval	12/03/2009	74 FR 63309	Effective: 01/04/2010
Inland Sheboygan County, WI
Clean Data Determination
Proposed Approval	12/15/2010	75 FR 78197
Direct Final	12/15/2010	75 FR 78164	Effective: 02/14/2010
Withdrawal	01/28/2011	76 FR 5078	Effective: 01/28/2011
Final Approval	03/01/2011	76 FR 11080	Effective: 03/31/2011
Determination of Attainment by Attainment Date
Proposed Approval	10/09/2020	85 FR 64089
Direct Final	10/09/2020	85 FR 64046	Effective: 01/07/2021
Withdrawal	12/09/2020	85 FR 79129	Effective: 12/09/2020
Final Approval	07/29/2021	86 FR 40784	Effective: 08/30/2021
Jamestown, NY
Clean Data Determination
Proposed Approval	09/23/2009	74 FR 48498
Final Approval	12/07/2009	74 FR 63993	Effective: 01/06/2010
Determination of Attainment by Attainment Date
Proposed Approval	10/09/2020	85 FR 64089
Direct Final	10/09/2020	85 FR 64046	Effective: 01/07/2021
Withdrawal	12/09/2020	85 FR 79129	Effective: 12/09/2020
Final Approval	07/29/2021	86 FR 40784	Effective: 08/30/2021
Jefferson County, NY
Clean Data Determination
Proposed Approval	02/14/2008	73 FR 8637
Final Approval	03/25/2008	73 FR 15672	Effective: 03/25/2008
Determination of Attainment by Attainment Date
Proposed Approval	10/09/2020	85 FR 64089
Direct Final	10/09/2020	85 FR 64046	Effective: 01/07/2021
Withdrawal	12/09/2020	85 FR 79129	Effective: 12/09/2020
Final Approval	07/29/2021	86 FR 40784	Effective: 08/30/2021
Kern County (Eastern Kern), CA
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	09/14/2012	77 FR 56797
Direct Final	09/14/2012	77 FR 56775	Effective: 11/13/2012
Withdrawal	11/07/2012	77 FR 66715	Effective: 11/07/2012
Final Approval	12/03/2012	77 FR 71551	Effective: 01/02/2013
Mariposa and Tuolumne Cos. (Southern Mountain Counties), CA
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	09/14/2012	77 FR 56797
Direct Final	09/14/2012	77 FR 56775	Effective: 11/13/2012
Withdrawal	11/07/2012	77 FR 66715	Effective: 11/07/2012
Final Approval	12/03/2012	77 FR 71551	Effective: 01/02/2013
Nevada County (Western part), CA
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	09/14/2012	77 FR 56797
Direct Final	09/14/2012	77 FR 56775	Effective: 11/13/2012
Withdrawal	11/07/2012	77 FR 66715	Effective: 11/07/2012
Final Approval	12/03/2012	77 FR 71551	Effective: 01/02/2013
New York-N. New Jersey-Long Island, NY-NJ-CT
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	01/25/2012	77 FR 3720
Final Approval	06/18/2012	77 FR 36163	Effective: 07/18/2012
Clean Data Determination Rescinded
Proposed Approval	05/15/2014	79 FR 27830
Final Approval	05/04/2016	81 FR 26697	Effective: 06/03/2016
Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	12/09/2011	76 FR 76929
Final Approval	03/26/2012	77 FR 17341	Effective: 04/25/2012
Pittsburgh-Beaver Valley, PA
Clean Data Determination
Proposed Approval	02/07/2011	76 FR 6590
Final Approval	05/31/2011	76 FR 31237	Effective: 06/30/2011
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	12/10/2012	77 FR 73387
Final Approval	04/04/2013	78 FR 20244	Effective: 05/06/2013
Poughkeepsie, NY
Clean Data Determination
Proposed Approval	09/23/2009	74 FR 48498
Final Approval	12/07/2009	74 FR 63993	Effective: 01/06/2010
Determination of Attainment by Attainment Date
Proposed Approval	10/09/2020	85 FR 64089
Direct Final	10/09/2020	85 FR 64046	Effective: 01/07/2021
Withdrawal	12/09/2020	85 FR 79129	Effective: 12/09/2020
Final Approval	07/29/2021	86 FR 40784	Effective: 08/30/2021
Providence (all of RI), RI
Clean Data Determination
Proposed Approval	02/25/2010	75 FR 8571
Final Approval	06/03/2010	75 FR 31288	Effective: 07/06/2010
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	07/28/2010	75 FR 44179
Final Approval	10/21/2010	75 FR 64949	Effective: 11/22/2010
Shoreline Sheboygan County, WI
Clean Data Determination
Proposed Approval	12/15/2010	75 FR 78197
Direct Final	12/15/2010	75 FR 78164	Effective: 02/14/2010
Withdrawal	01/28/2011	76 FR 5078	Effective: 01/28/2011
Final Approval	03/01/2011	76 FR 11080	Effective: 03/31/2011
Determination of Attainment by Attainment Date
Proposed Approval	10/09/2020	85 FR 64089
Direct Final	10/09/2020	85 FR 64046	Effective: 01/07/2021
Withdrawal	12/09/2020	85 FR 79129	Effective: 12/09/2020
Final Approval	07/29/2021	86 FR 40784	Effective: 08/30/2021
Springfield (W. Mass), MA
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	01/23/2012	77 FR 3220
Final Approval	06/19/2012	77 FR 36404	Effective: 07/19/2012
Washington, DC-MD-VA
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	09/20/2011	76 FR 58206
Final Approval	02/28/2012	77 FR 11739	Effective: 03/29/2012
MARGINAL
Albany-Schenectady-Troy, NY
Clean Data Determination
Proposed Approval	02/14/2008	73 FR 8637
Final Approval	03/25/2008	73 FR 15672	Effective: 03/25/2008
Chico, CA
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	09/14/2012	77 FR 56797
Direct Final	09/14/2012	77 FR 56775	Effective: 11/13/2012
Withdrawal	11/07/2012	77 FR 66715	Effective: 11/07/2012
Final Approval	12/03/2012	77 FR 71551	Effective: 01/02/2013
Denver-Boulder-Greeley-Ft. Collins-Loveland, CO
Determination of Attainment by Attainment Date
Proposed Approval	10/09/2020	85 FR 64089
Direct Final	10/09/2020	85 FR 64046	Effective: 01/07/2021
Withdrawal	12/09/2020	85 FR 79129	Effective: 12/09/2020
Final Approval	07/29/2021	86 FR 40784	Effective: 08/30/2021
Essex County (Whiteface Mtn.), NY
Clean Data Determination
Proposed Approval	09/23/2009	74 FR 48498
Final Approval	12/07/2009	74 FR 63993	Effective: 01/06/2010
Rochester, NY
Clean Data Determination
Proposed Approval	02/14/2008	73 FR 8637
Final Approval	03/25/2008	73 FR 15672	Effective: 03/25/2008
San Francisco Bay Area, CA
Determination of Attainment by Attainment Date
Proposed Approval	10/09/2020	85 FR 64089
Direct Final	10/09/2020	85 FR 64046	Effective: 01/07/2021
Withdrawal	12/09/2020	85 FR 79129	Effective: 12/09/2020
Final Approval	07/29/2021	86 FR 40784	Effective: 08/30/2021
Sutter County (part) (Sutter Buttes), CA
Both Clean Data Determination and Determination of Attainment by Attainment Date
Proposed Approval	09/14/2012	77 FR 56797
Direct Final	09/14/2012	77 FR 56775	Effective: 11/13/2012
Withdrawal	11/07/2012	77 FR 66715	Effective: 11/07/2012
Final Approval	12/03/2012	77 FR 71551	Effective: 01/02/2013

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