Air Plan Approval: Detroit, Michigan 2010 Sulfur Dioxide Redesignation and Maintenance Plan

The U.S. Environmental Protection Agency (EPA) has formally determined that the Detroit, Michigan metropolitan area is now in attainment of the 2010 National Ambient Air Quality Standard (NAAQS) for sulfur dioxide (SO2). This determination follows a redesignation request submitted by the Michigan Department of Environment, Great Lakes, and Energy (EGLE) on May 5, 2025, which the EPA found to meet all statutory requirements under the Clean Air Act (CAA). As part of this action, the EPA is officially redesignating the Detroit nonattainment area to 'attainment' status for the 2010 SO2 NAAQS. The EPA had previously approved Michigan's attainment plan for the Detroit area on May 19, 2025, laying the regulatory groundwork for this redesignation. The EPA is also approving Michigan's maintenance plan for the Detroit area, which is designed to ensure that SO2 concentrations remain at or below the NAAQS threshold going forward. The maintenance plan commits the state to ongoing monitoring and control measures to prevent future violations of the standard. This rule represents a significant environmental milestone for the Detroit area, signaling improved air quality and reduced SO2 pollution — a pollutant linked to respiratory disease, acid rain, and ecosystem damage — in one of the historically most industrially active regions of the United States.

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