# Air Plan Approval; Michigan; Second Period Regional Haze Plan
> **Rule** · Final rule. · Published 2025-09-05 · Effective 2025-10-06 · 90 FR 42833
## Document
- **Document number:** 2025-17096
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 42833
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-09-05
- **Effective date:** 2025-10-06
- **State:** MI
- **EPA docket:** EPA-R05-OAR-2021-0577
## Abstract

The Environmental Protection Agency (EPA) is approving the Regional Haze State Implementation Plan (SIP) revision submitted by the Michigan Department of Environment, Great Lakes, and Energy (EGLE) on August 23, 2021, and supplemented on July 24, 2025, as satisfying applicable requirements under the Clean Air Act (CAA) and EPA's Regional Haze Rule (RHR) for the program's second implementation period. EGLE's SIP submission addresses the requirement that States must periodically revise their long-term strategies for making reasonable progress towards the national goal of preventing any future, and remedying any existing, anthropogenic impairment of visibility, including regional haze, in mandatory Class I Federal areas. The SIP submission also addresses other applicable requirements for the second implementation period of the regional haze program. EPA is taking this action pursuant to sections 110 and 169A of the CAA.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/09/05/2025-17096/air-plan-approval-michigan-second-period-regional-haze-plan)
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