Environmentalists and lawmakers from both parties welcomed the announcement, saying it was an overdue move by an official who sought to undermine the mission of the agency he headed.
Newly released emails show the Trump administration tried to stop the public from seeing a federal report on a toxic chemical used in nonstick cookware and firefighting foam at military installations.
The lawsuit charges that the Allegheny County Health Department is failing to ensure that some of the most dangerous sources of air pollution in the region are operating in compliance with air quality laws.
