EPA redesignates Detroit area to “attainment” for sulfur dioxide; area now meets national air quality standards

EPA redesignates Detroit area to "attainment" for sulfur dioxide; area now meets national air quality standards

Cleaner air for Detroit as sulfur dioxide levels drop more than 57% over 15 years

April 3, 2026

U.S. Environmental Protection Agency (EPA) is announcing the redesignation of the Detroit area to "attainment" for sulfur dioxide emissions after air monitoring shows the region meets the national health-based standard.

"Reducing sulfur dioxide emissions protects Michigander families, and redesignating the area supports economic development," said EPA Regional Administrator Anne Vogel. "Paving the way for a healthy and thriving Detroit would not have been possible without EPA's strong partnership with state and industry leaders."

In 2013, EPA designated the Detroit area as "nonattainment" for the sulfur dioxide standard because readings were above the health-based limit. Since then, Michigan EGLE has worked with sources in the area to reduce levels in the air. Significant emission controls at facilities including U.S. Steel, EES Coke Battery, and Dearborn Industrial Generation resulted in a reduction of more than 57% of airborne sulfur dioxide. As a result, the area now meets EPA's clean air standards.

With this redesignation, air permitting will be faster and more predictable while strong health protections will remain in place. Existing emission controls and monitoring will continue to ensure air quality remains healthy. If monitored levels approach or exceed the health-based standard, Michigan must act quickly to address the situation.

To learn more about sulfur dioxide and the National Ambient Air Quality Standards, visit EPA's website.