December 05, 2025
The Sixth Circuit reversed a U.S. Environmental Protection Agency determination that the Detroit area meets federal air quality standards, ruling Friday that the state of Michigan failed to implement federally required air pollution controls.
December 12, 2024
A Sixth Circuit judge questioned Thursday whether a Sierra Club challenge over Detroit's air quality was "a debate over the science" as opposed to the law, as the group fights federal regulators' determination that air pollution in the area is under control.
January 18, 2024
Michigan health professionals have joined the Sierra Club in contesting a federal agency's determination that southeast Michigan's air pollution is under control, arguing in a friend-of-the-court brief this week that the decision will exacerbate already-poor respiratory health in residents of the Detroit area.
July 18, 2023
The Sierra Club has challenged the Environmental Protection Agency's determination that the Detroit area meets health standards for ozone levels and that the state has implemented plans to keep air quality within those standards for the next decade, as the area has experienced some of the most unhealthy air quality in the world in recent months.