Approval and Promulgation of Air Quality Implementation Plans; Michigan; Withdrawal of the Federal Implementation Plan for the Detroit Sulfur Dioxide Area

Open for public comment until Dec. 28, 2026. Comment on Regulations.gov

What it does

The U.S. Environmental Protection Agency (EPA) is proposing to withdraw the Federal Implementation Plan (FIP), promulgated on October 12, 2022 (the "2022 FIP"), for attaining the 2010 1-hour primary sulfur dioxide (SO<INF>2</INF>) National Ambient Air Quality Standard (NAAQS) in the Detroit area. On May 19, 2025, the EPA approved a revision to Michigan's State Implementation Plan (SIP) for attaining the 2010 1-hour primary SO<INF>2</INF> NAAQS in the Detroit area, rendering the 2022 FIP duplicative. The EPA is proposing this action pursuant to Clean Air Act (CAA) section 110.

The Environmental Protection Agency's summary, as published in the Federal Register.

What it would change

1 part of Title 40 of the Code of Federal Regulations:

40 CFR 52

What happens next and when

Comments must be received on or before December 28, 2026.

The agency's dates, word for word.

Check it yourself

• The document in the Federal Register
• Title 40 on eCFR

The record as published

Source: the Federal Register (public domain). The document in the Federal Register