8-Hour Ozone (1997) Attainment Date Extensions - NAAQS Revoked

Data is current as of March 31, 2025
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The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).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
Riverside County (Coachella Valley), CA
Proposed Approval	03/17/2025	90 FR 12239
SERIOUS
Baltimore, MD
Extension from 6/15/2010 to 6/15/2011
Proposed Approval	07/23/2010	75 FR 43114
Direct Final	07/23/2010	75 FR 43069	Effective: 09/21/2010
Withdrawal	09/08/2010	75 FR 54497
Final Approval	03/11/2011	76 FR 13289	Effective: 04/11/2011
MODERATE
Atlanta, GA
Extension from 6/15/2010 to 6/15/2011
Proposed Approval	09/17/2010	75 FR 56943
Final Approval	11/30/2010	75 FR 73969	Effective: 12/30/2010
Charlotte-Gastonia-Rock Hill, NC-SC
Extension from 6/15/2010 to 6/15/2011
Proposed Approval	08/04/2010	75 FR 46881
Final Approval	05/31/2011	76 FR 31245	Effective: 06/30/2011
Mariposa and Tuolumne Cos. (Southern Mountain Counties), CA
Extension from 6/15/2010 to 6/15/2011
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
Extension from 6/15/2010 to 6/15/2011
Final Approval	12/03/2012	77 FR 71551	Effective: 01/02/2013
Nevada County (Western part), CA
Extension from 6/15/2010 to 6/15/2011
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
Extension from 6/15/2010 to 6/15/2011
Final Approval	12/03/2012	77 FR 71551	Effective: 01/02/2013
Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE
Extension from 6/15/2010 to 6/15/2011 (NJ portion)
Proposed Approval	11/09/2010	75 FR 68733
Extension from 6/15/2010 to 6/15/2011 (DE, MD, PA portions)
Proposed Approval	11/09/2010	75 FR 68736
Extension from 6/15/2010 to 6/15/2011 (NJ portion)
Final Approval	01/21/2011	76 FR 3838	Effective: 02/22/2011
Extension from 6/15/2010 to 6/15/2011 (DE, MD, PA portions)
Final Approval	01/21/2011	76 FR 3840	Effective: 02/22/2011

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