"Texas environmentalists faced off in court this year against a coal-fired power plant with more than 6,500 alleged exceedances of the federal Clean Air Act limits on opacity, an indicator of fine airborne soot."

"As concerns mount over people’s exposure to the plasticizer bisphenol A in everyday products, it’s also contaminating the air near manufacturing plants: U.S. companies emitted about 26 tons of the hormone-disrupting compound in 2013."

"The Obama administration is preparing to unveil an air pollution rule shortly after the midterm elections that could be among the most costly and controversial in history."

"A surprising hot spot of the potent global-warming gas methane hovers over part of the southwestern U.S., according to satellite data."

"The Environmental Protection Agency (EPA) sent potential changes to the standard for ground-level ozone to the White House Office of Management and Budget on Wednesday."

"Methane emissions from oil and gas wells on federal lands and waters jumped 135 percent from 2008 to 2013, an analysis shows, driven by a drilling boom in New Mexico and North Dakota that has outpaced the building of pipelines and processing centers."

"The Supreme Court on Monday rejected an industry challenge to U.S. Environmental Protection Agency regulations issued by Republican former President George W. Bush's administration that set standards for ozone pollution."

"When Twa-le Abrahamson-Swan tested her Spokane, Washington, home for radon, she already knew about the dangers of the invisible, odorless radioactive gas."

"A week before major UN talks on climate change, EPA extends comment period for rule to cut carbon pollution from plants."

"The ozone layer that shields life from cancer-causing solar rays is showing its first sign of recovery after years of dangerous depletion, a U.N. study said on Wednesday, in a rare piece of good news on the environment."