Trump administration argues current limits on soot are protective of public health, even as critics say stricter rules are needed to protect vulnerable communities.
The Allegheny County Health Department has reached a final settlement agreement and order with U.S. Steel over air pollution violations at the Clairton Coke Works.
Ten oil refineries in the United States are emitting levels of the pollutant benzene well above the federal government's "action level" limit, according to a new report.
