EPA Approves Michigan's Ozone Air Quality Improvement in Two Counties
Official: Air Plan Approval; Michigan; Clean Data Determination for the Berrien, MI and Muskegon, MI Areas for the 2015 Ozone Standards
Reading: The EPA's approval suspends further attainment-planning requirements because the areas met the existing 2015 ozone NAAQS; this is a maintenance determination that extends the areas' status under the current federal standard without tightening or relaxing the standard itself.
This approval is based on air monitoring data from 2023–2025 showing the areas met the 2015 federal ozone standard.
In clear language
The EPA has determined that Berrien County and Muskegon County in Michigan have successfully met federal air quality standards for ozone pollution. Because these areas are now clean, Michigan no longer needs to submit detailed plans to further improve ozone levels in those counties. This approval is based on air monitoring data from 2023–2025 showing the areas met the 2015 federal ozone standard.
How does this affect you?
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Who does this affect?
- Residents of Berrien County and Muskegon County, Michigan (local air quality improved)
- Michigan state environmental agency (reduced regulatory paperwork and planning requirements)
- Businesses in those counties (fewer mandated pollution-control measures required)
What can you do?
- If you live in Berrien or Muskegon County, monitor your local air quality at airnow.gov to see ongoing improvements
- Stay informed about ozone alerts during summer months, which remain important even after attainment
Timeline
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- Effective: 2026-10-09
- 2023–2025: Design value period used to measure attainment
- December 26, 2025: Michigan submitted exceptional events request to EPA
- January 12, 2026: EPA concurred with exceptional events request
- October 9, 2026: EPA issued final clean data determination (effective immediately)
No New Jersey official has a verified action on this policy yet.
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