Despite progress, Southern California's air remains home to some of the worst air in the United States, the American Lung Association said Tuesday in its annual State of the Air report.
A new U.S. Environmental Protection Agency formula for calculating the amount of pollutants released by flares at refineries and chemical plants nationwide shows that those emissions are four times higher than previously thought.
The use of clean fuels and updated pollution control measures in school buses that 25 million children ride every day could result in 14 million fewer absences from school a year, based on a study by the University of Michigan and the University of Washington.
China has revived a controversial concept to monitor pollution, a decade after its first attempt at calculating its "green GDP" suffered a swift death.
The Obama administration also is releasing a new scorecard to publicly track self-reported emissions disclosure and progress for all major federal suppliers.
Doctors call for life-saving protections at federal EPA hearing in Arlington.