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

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

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


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 101901Effective: 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 101901Effective: 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 101901Effective: 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 101901Effective: 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

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 103657Effective: 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 101901Effective: 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 101901Effective: 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

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 101901Effective: 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 101901Effective: 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 101483Effective: 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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