"Ten U.S. states and Washington, D.C. sued the Environmental Protection Agency to begin working on rules to tighten oversight of asbestos, and reduce the health risks that the substance poses to the public."

"Those thin white clouds that jet engines draw across the sky are leaving their mark on the climate. A new study warns that the global heat-trapping effect of contrail clouds will triple by 2050 unless airlines and airplane builders dramatically reduce emissions or air traffic patterns change."

"Don't get out your Swiffer, but there's a whole heap of dust headed our way from Africa. The dust, which originates in the Sahara Desert, is going to help Florida dodge tropical storms at the start of hurricane season."

"A former regional administrator will temporarily lead EPA's high-profile Office of Air and Radiation, following the exit of air chief Bill Wehrum."

"Canada has signaled a willingness to buck one of President Trump’s most significant environmental rollbacks — a major weakening of auto pollution standards — by signing a clean-car deal with California, the state leading the fight against the rollback."

"Bill Wehrum, a top Environmental Protection Agency official who helped reverse Obama-era rules aimed at cutting emissions of greenhouse gases and other air pollutants, is stepping down amid scrutiny over possible violations of federal ethics rules."

"The EPA is reversing a 24-year-old air policy that would allow power plants, refineries and other industrial sources to avoid stringent controls for toxic air pollution, it announced June 25."

"The head of the national coal miners’ union on Thursday urged the Trump administration to impose regulation on silica dust in mines, which researchers believe is responsible for a resurgence of black lung disease in central Appalachia."