# Air Plan Approval; Michigan; Clean Data Determination for the Berrien, MI and Muskegon, MI Areas for the 2015 Ozone Standards

**Action Urgency Score:** 30/100

| Field | Value |
|---|---|
| Agency | Environmental Protection Agency |
| Type | Final rule |
| Action | Final rule. |
| Published | 2026-10-09 |
| Effective | 2026-10-09 |
| Significant | No |
| CFR parts | 40 CFR 52 |
| Summary | The U.S. Environmental Protection Agency (EPA) is determining under the Clean Air Act (CAA) that the Berrien County and Muskegon County, Michigan nonattainment areas have attained the 2015 ozone National Ambient Air Quality Standards (NAAQS). This determination, informally known as a clean data determination, is based upon complete, quality assured, and certified ambient air monitoring data for the 2023-2025 design value period showing that the areas achieved attainment of the 2015 ozone NAAQS. This clean data determination also relies upon the Michigan Department of Environment, Great Lakes,  |
| Document number | 2026-20736 |

## Why this score
- Final rule.

Source: Federal Register API (Office of the Federal Register) (https://www.federalregister.gov/documents/2026/10/09/2026-20736/air-plan-approval-michigan-clean-data-determination-for-the-berrien-mi-and-muskegon-mi-areas-for-the). Last refreshed: 2026-11-04T09:17:43.641Z.
Data from the Federal Register API; the published Federal Register document is authoritative. Informational only, not legal advice.