8-Hour Ozone (2015) Federal Register Notice Classification Changes

Data is current as of November 30, 2025
Ordered by Classification

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

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SEVERE 15
San Diego County, CA
Reclassify from Moderate to Severe 15
Proposed Approval	04/08/2021	86 FR 18227
Final Approval	06/02/2021	86 FR 29522	Effective: 07/02/2021
SERIOUS
Allegan County, MI
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	12/17/2024	89 FR 101901	Effective: 01/16/2025
Baltimore, MD
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	08/01/2024	89 FR 62663	Effective: 08/01/2024
Berrien County, MI
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	12/17/2024	89 FR 101901	Effective: 01/16/2025
Chicago, IL-IN-WI
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	12/17/2024	89 FR 101901	Effective: 01/16/2025
Cleveland, OH
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	12/17/2024	89 FR 101901	Effective: 01/16/2025
Dallas-Fort Worth, TX
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Proposed Approval	01/26/2024	89 FR 5145
Final Approval	06/20/2024	89 FR 51829	Effective: 07/22/2024
Denver Metro/North Front Range, CO
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	07/24/2024	89 FR 59832	Effective: 07/24/2024
Greater Connecticut, CT
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	07/29/2024	89 FR 60827	Effective: 07/29/2024
Proposed Approval	11/20/2025	90 FR 52279
Houston-Galveston-Brazoria, TX
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Proposed Approval	01/26/2024	89 FR 5145
Final Approval	06/20/2024	89 FR 51829	Effective: 07/22/2024
Kern County (Eastern Kern), CA
Reclassify from Moderate to Serious
Proposed Approval	08/13/2021	86 FR 44677
Final Approval	10/28/2021	86 FR 59648	Effective: 11/29/2021
Las Vegas, NV
Reclassify from Marginal to Moderate
Proposed Approval	07/22/2022	87 FR 43764
Final Approval	01/05/2023	88 FR 775	Effective: 01/05/2023
Reclassify from Moderate to Serious
Final Approval	12/19/2024	89 FR 103657	Effective: 01/21/2025
Milwaukee, WI
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	12/17/2024	89 FR 101901	Effective: 01/16/2025
Muskegon County, MI
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	12/17/2024	89 FR 101901	Effective: 01/16/2025
Nevada County (Western part), CA
Reclassify from Moderate to Serious
Proposed Approval	08/13/2021	86 FR 44677
Final Approval	10/28/2021	86 FR 59648	Effective: 11/29/2021
New York-Northern New Jersey-Long Island, NY-NJ-CT
Reclassify from Moderate to Serious
Final Approval	07/25/2024	89 FR 60314	Effective: 07/25/2024
Final Approval	07/31/2025	90 FR 35985	Effective: 09/02/2025
Northern Wasatch Front, UT
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	12/09/2024	89 FR 97545	Effective: 01/08/2025
Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	07/30/2024	89 FR 61025	Effective: 07/30/2024
Sacramento Metro, CA
Reclassify from Moderate to Serious
Proposed Approval	08/13/2021	86 FR 44677
Final Approval	10/28/2021	86 FR 59648	Effective: 11/29/2021
San Antonio, TX
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Proposed Approval	01/26/2024	89 FR 5145
Final Approval	06/20/2024	89 FR 51829	Effective: 07/22/2024
Sheboygan County, WI
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	12/17/2024	89 FR 101901	Effective: 01/16/2025
St. Louis, MO-IL
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Reclassify from Moderate to Serious
Final Approval	11/25/2024	89 FR 92816	Effective: 12/31/2024
Final Approval	12/17/2024	89 FR 101901	Effective: 01/16/2025
Proposed Approval	06/20/2025	90 FR 26240
MODERATE
Cincinnati, OH-KY
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Detroit, MI
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	02/01/2023	88 FR 6633	Effective: 03/01/2023
Louisville, KY-IN
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Mariposa County, CA
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, CA
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Phoenix-Mesa, AZ
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Uinta Basin, UT
Reclassify from Marginal to Moderate
Final Approval	12/16/2024	89 FR 101483	Effective: 01/15/2025
Washington, DC-MD-VA
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
MARGINAL
Cincinnati, OH-KY
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
Louisville, KY-IN
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842
Final Approval	10/07/2022	87 FR 60897	Effective: 11/07/2022
MARGINAL (RURAL TRANSPORT)
Door County-Revised, WI
Reclassify from Marginal to Moderate
Proposed Approval	04/13/2022	87 FR 21842

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