The US Environmental Protection Agency on Wednesday said it plans to strengthen regulations for emissions of ozone, a smog-causing pollutant blamed for respiratory ailments affecting millions of Americans.
New images from NASA's Aura satellite show that over the last decade, the amount of the pollutant nitrogen dioxide in the nation's air has decreased significantly. Continue reading →
November's mid-term elections have left hopes for climate change legislation in the United States in tatters.
The U.S. House of Representatives has passed a bill that limits the Environmental Protection Agency's ability to enforce national water quality standards, giving upstream states greater authority over rivers than downstream states.
Sulfur dioxide pollution from coal plants in the eastern United States dropped by nearly half compared to 2005 levels.