Agency: Environmental Protection Agency
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, and Energy's (EGLE's) exceptional events request submitted to the EPA on December 26, 2025, and which the EPA concurred on January 12, 2026. As a result of this determination, the EPA is suspending th