"The Obama administration is set to announce that it will require new rules to cut emissions from airplanes, expanding a quest to tackle climate change that has included a string of significant regulations on cars, trucks and power plants."

"A federal appeals court [Tuesday] rejected a series of challenges from states, environmental groups and energy companies to U.S. EPA's determinations of which parts of the country meet its standard for ozone, a main component of smog."

A recent study showed that nearly half of Delhi’s 4.4 million schoolchildren have irreversible lung damage from the poisonous air.

"ANN ARBOR, Mich. — Inside the National Vehicle and Fuel Emissions Laboratory here, a mammoth contraption, with steel rollers, advanced electronics and exhaust tubes, is nearing completion."

"A federal court has rejected Kansas’ challenge of the Environmental Protection Agency’s (EPA) disapproval of an air pollution plan from the state."

"New study finds fracking releases cancer-causing chemicals into the air many times higher than the EPA considers safe."

"Power companies have been turning off pollution control equipment at coal-fired plants and allowing massive amounts of contaminants to escape through the stacks — a practice that is perfectly legal and saves the plants money but ends up contributing to chronic air and health issues in New Jersey."

"The Sierra Club launched a system Tuesday to send text message alerts when smog pollution is at a high level in certain areas."

"Even though Maryland has yet to permit any hydraulic fracturing for natural gas, emissions linked to the controversial drilling technique have been detected in the air in Baltimore and Washington, according to a new study."

"Scientists, planes and instruments descend on San Juan Basin to find roots of the massive greenhouse gas hotspot."