Final rule · 2025-08727

Air Plan Approval; Michigan; Attainment Plan for the Detroit 2010 Sulfur Dioxide Nonattainment Area

The Environmental Protection Agency (EPA) is approving the State Implementation Plan (SIP) revision submitted by Michigan on December 20, 2022, and supplemented on February 21, 2023, December 14, 2023, and April 2, 2024, which amends a SIP submission previously submitted to EPA on May 31, 2016, and June 30, 2016, for attaining the 2010 sulfur dioxide (SO<INF>2</INF>) primary national ambient air quality standard (NAAQS) for the Detroit SO<INF>2</INF> nonattainment area. This action follows a prior action which found that Michigan had satisfied emission inventory and new source review (NSR) requirements for this area but had not met requirements under the Clean Air Act (CAA) for the elements that EPA is approving here. This action also follows the promulgation of the 2022 Federal Implementation Plan (FIP) for the Detroit SO<INF>2</INF> nonattainment area.