Toxic Air Pollutants

On March 31, 2026, a coalition of 21 states and local governments filed a lawsuit in Washington, D.C., challenging the Trump Administration’s repeal of the 2024 Mercury and Air Toxics Standards (MATS) Rule and return to outdated standards that harm the environment and public health. We argue that the repeal is unlawful because the EPA has failed to provide a reasoned basis for it and failed to adequately consider developments in practices, processes and control technologies in its attempt to revert to outdated standards. 

Illinois, et al v. EPA