U.S. FEDRegulation
EPA issues clean data determination for Berrien and Muskegon County, Michigan ozone areas
The Environmental Protection Agency issued a final rule determining that the Berrien County and Muskegon County, Michigan nonattainment areas attained the 2015 ozone national ambient air quality standards. The determination rests on certified 2023–2025 monitoring data and Michigan's exceptional events request, which EPA concurred in on January 12, 2026. The agency suspends the areas' attainment demonstration and related planning requirements for as long as they continue to attain. It took effect October 9, 2026.
Key points
- Berrien and Muskegon County, Michigan areas attained the 2015 ozone NAAQS.Federal Register
- Based on quality-assured 2023–2025 monitoring data showing attainment.Federal Register
- EPA concurred in Michigan's exceptional events request on January 12, 2026.Federal Register
- Attainment demonstration and associated planning requirements suspended.Federal Register
- Effective October 9, 2026; published as 91 FR 64623.Federal Register
- Amends 40 CFR part 52 (FR Doc. 2026-20736).Federal Register
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RegulationU.S.EPA Clean Data Determination for Berrien and Muskegon County, MI Ozone Areas (2026)EnvironmentalFor practitionersFor governance