The Labadie Energy Center and the Sioux Energy Center in Missouri will have two extra years to limit emissions of mercury and ...

Canceled grants and shifting federal priorities are halting progress — and prompting a legal fight to protect climate initiatives and health.

Under the Clean Air Act, commercial trucks, school buses, and vehicles in federal emissions testing areas still need regular inspections.

States will have fewer compliance problems with coal-fired power plants and other sources of haze-forming emissions like sulfur dioxide and soot.

Trump’s deregulatory agenda is putting Americans at risk and completely trampling on his vow to “Make America Healthy Again.” ...

California fights America's worst smog with the country's toughest environmental regulations. But is the Golden State really ...

Mr. Trump issued an executive order opening up the Pacific Islands Heritage Marine National Monument, which lies some 750 ...