"The Environmental Protection Agency issued a new health standard on Thursday for sulfur dioxide emissions, the first such revision in nearly 40 years."

"The Environmental Protection Agency moved Tuesday to end a long-running dispute with Texas over how the state regulates emissions, including cancer-causing toxins such as benzene and butadiene, from dozens of refineries that produce a third of the nation's gasoline and billions of dollars of petrochemicals."

"The EPA is warning that Gulf Coast residents are at risk of headaches, nausea, and other ill health effects; the culprit is air pollution from the oil burns that response teams are conducting to try to keep the big slick away from coastlines."

"Six in 10 Americans -- about 175 million people -- are living in places where air pollution often reaches dangerous levels, despite progress in reducing particle pollution, the American Lung Association said in a report released Wednesday."

"The nation's oil and chemical plants are spewing a lot more pollution than they report to the Environmental Protection Agency -- and the EPA knows it. But the federal agency has yet to adopt more accurate, higher-tech measuring methods that have been available for years."

"When you combine Albuquerque's few trees with the city's hot, dry and often windy weather, it could mean big problems for allergy sufferers. This despite a 1994 pollen-control ordinance that bars residents from planting certain types of trees."

"The Environmental Protection Agency has ordered air pollution limits tightened on a Baltimore trash-to-energy incinerator after finding the state improperly relaxed them and did not require adequate monitoring of the plant's toxic emissions."