Air

"Potash Corp of Saskatchewan Inc agreed to spend more than $52 million on plant improvements and pay a $1.3 million civil penalty to resolve U.S. charges that it violated the Clean Air Act over the emission of harmful pollutants such as sulfur dioxide, U.S. authorities said."

"An ozone-destroying chemical long thought to be on the decline in Earth’s upper atmosphere is making an unexpected comeback, an international team of scientists has found."

"Antarctic hole in protective layer of gas stands around same level as 2010, 2012 and 2013, but scientists say recovery is on track"

"Federal appellate judges greenlighted yesterday U.S. EPA's implementation of a program to curb air pollution that drifts between states."

"Federal regulators on Friday unveiled a program to monitor air quality during the remaining cleanup at the Freedom Industries facility along the Elk River in Charleston, but they said their effort suffers from the same lack of data about potential health efforts of the chemical MCHM as did testing of the region’s drinking-water supply after the Jan. 9 leak."

"A study in a rural Ohio county where oil and gas drilling is booming found air pollution levels near well sites higher than those in downtown Chicago."

"More than 5 million Californians — most of them in Los Angeles and Kern counties — live near an oil or gas well, and expanding drilling in the state could increase their exposure to health risks, according to a report released Wednesday by a national environmental group."

"ODESSA, Texas -- Elaine Beadle initially thought the odor creeping into her home on this city's west side was a sewer leak."

"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."