8-Hour Ozone (2008) Clean Data Determination/Attainment Determinations For Areas with Current Nonattainment Status

Data is current as of November 30, 2025
Ordered by Area Name

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

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SEVERE 15
Sacramento Metro, CA
Determination of Attainment by Attainment Date
Proposed Approval	03/21/2025	90 FR 13316
Final Approval	08/21/2025	90 FR 40741	Effective: 09/22/2025
SERIOUS
Greater Connecticut, CT
Clean Data Determination
Proposed Approval	03/27/2020	85 FR 17301
Final Approval	07/13/2020	85 FR 41924	Effective: 08/12/2020
Determination of Attainment by Attainment Date
Proposed Approval	04/13/2022	87 FR 21825
Final Approval	10/07/2022	87 FR 60926	Effective: 11/07/2022
Nevada County (Western part), CA
Determination of Attainment by Attainment Date
Proposed Approval	07/14/2022	87 FR 42126
Final Approval	10/20/2022	87 FR 63698	Effective: 11/21/2022
Ventura County, CA
Determination of Attainment by Attainment Date
Proposed Approval	07/14/2022	87 FR 42126
Final Approval	10/20/2022	87 FR 63698	Effective: 11/21/2022
MODERATE
Baltimore, MD
Clean Data Determination
Proposed Approval	03/18/2015	80 FR 14041
Final Approval	06/01/2015	80 FR 30941	Effective: 07/01/2015
Determination of Attainment by Attainment Date
Proposed Approval	11/14/2018	83 FR 56781
Final Approval	08/23/2019	84 FR 44238	Effective: 09/23/2019
Mariposa County, CA
Clean Data Determination
Proposed Approval	12/21/2016	81 FR 93653
Direct Final	12/21/2016	81 FR 93624	Effective: 03/21/2017
Determination of Attainment by Attainment Date
Proposed Approval	11/14/2018	83 FR 56781
Final Approval	08/23/2019	84 FR 44238	Effective: 09/23/2019
Phoenix-Mesa, AZ
Determination of Attainment by Attainment Date
Proposed Approval	06/13/2019	84 FR 27566
Final Approval	11/12/2019	84 FR 60920	Effective: 12/12/2019
MARGINAL
Allentown-Bethlehem-Easton, PA
Determination of Attainment by Attainment Date
Proposed Approval	08/27/2015	80 FR 51992
Final Approval	05/04/2016	81 FR 26697	Effective: 06/03/2016
Calaveras County, CA
Determination of Attainment by Attainment Date
Proposed Approval	08/27/2015	80 FR 51992
Final Approval	05/04/2016	81 FR 26697	Effective: 06/03/2016
Chico (Butte County), CA
Determination of Attainment by Attainment Date
Proposed Approval	08/27/2015	80 FR 51992
Final Approval	05/04/2016	81 FR 26697	Effective: 06/03/2016
Dukes County, MA
Determination of Attainment by Attainment Date
Proposed Approval	08/27/2015	80 FR 51992
Final Approval	05/04/2016	81 FR 26697	Effective: 06/03/2016
Jamestown, NY
Determination of Attainment by Attainment Date
Proposed Approval	08/27/2015	80 FR 51992
Final Approval	05/04/2016	81 FR 26697	Effective: 06/03/2016
Clean Data Determination
Proposed Approval	07/20/2018	83 FR 34506
Final Approval	10/02/2018	83 FR 49492	Effective: 11/01/2018
Lancaster, PA
Determination of Attainment by Attainment Date
Proposed Approval	08/27/2015	80 FR 51992
Final Approval	05/04/2016	81 FR 26697	Effective: 06/03/2016
Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE
Determination of Attainment by Attainment Date
Proposed Approval	04/18/2017	82 FR 18268
Final Approval	11/02/2017	82 FR 50814	Effective: 12/04/2017
Pittsburgh-Beaver Valley, PA
Determination of Attainment by Attainment Date
Proposed Approval	08/25/2016	81 FR 58435
Final Approval	12/06/2016	81 FR 87819	Effective: 01/05/2017
Reading, PA
Determination of Attainment by Attainment Date
Proposed Approval	08/27/2015	80 FR 51992
Final Approval	05/04/2016	81 FR 26697	Effective: 06/03/2016
San Francisco Bay Area, CA
Determination of Attainment by Attainment Date
Proposed Approval	08/27/2015	80 FR 51992
Final Approval	05/04/2016	81 FR 26697	Effective: 06/03/2016
San Luis Obispo (Eastern San Luis Obispo), CA
Determination of Attainment by Attainment Date
Proposed Approval	10/12/2016	81 FR 70382
Final Approval	12/21/2016	81 FR 93620	Effective: 01/20/2017
Seaford, DE
Determination of Attainment by Attainment Date
Proposed Approval	08/27/2015	80 FR 51992
Final Approval	05/04/2016	81 FR 26697	Effective: 06/03/2016
Tuscan Buttes, CA
Determination of Attainment by Attainment Date
Proposed Approval	08/27/2015	80 FR 51992
Final Approval	05/04/2016	81 FR 26697	Effective: 06/03/2016
Upper Green River Basin Area, WY
Determination of Attainment by Attainment Date
Proposed Approval	08/27/2015	80 FR 51992
Final Approval	05/04/2016	81 FR 26697	Effective: 06/03/2016

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