Air

"NASA, the agency best known for exploring space, is trying to answer some urgent questions about air pollution right here on Earth."

"Faced with a natural gas drilling boom that has sullied the air in some parts of the country, the Environmental Protection Agency on Thursday proposed for the first time to control air pollution at oil and gas wells, particularly those drilled using a method called hydraulic fracturing."

"The U.S. Environmental Protection Agency said on Tuesday it would again delay issuing a final limit on smog pollution opposed by manufacturers and many Republican lawmakers until the Obama administration has finished reviewing it."

"Less than half of Pennsylvania's fossil-fueled power plants have pollution controls, a long-tolerated dirty habit that's now getting its comeuppance in tougher, new federal regulations."

"Less than half of Pennsylvania's fossil-fueled power plants have pollution controls, a long-tolerated dirty habit that's now getting its comeuppance in tougher, new federal regulations."

"Secretary of State Hillary Clinton pushed one of her simplest but potentially most transformative diplomatic priorities in India on Wednesday: clean cooking stoves."

"People living in Ohio, Pennsylvania and Florida are most at risk in the United States from toxic emissions spewing from coal and oil-fired power plants, two leading American environmental groups said in a report on Wednesday."

Congress created a cap-and-trade plan for air pollution from the nation's aging fleet of power plants 20 years ago. In its time, it was successful in cutting pollution, but today, tattered by politics and lawsuits, its future is uncertain.

"A group of Texas refineries, chemical makers and power plants have agreed to seek new air pollution permits, marking a setback for state regulators defending an air pollution program popular with business."