"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."

"Lawsuit helped force an update of emissions standards for dangerous chemicals that went unchanged nearly 30 years."

"California is suffering from 'second-hand smog' drifting in from Asia and other places, researchers said on Tuesday, even as the state's prolonged drought has made air quality worse."

"A common pollutant in vehicle exhaust, power plant emissions and cigarette smoke can shrink white matter in fetal brains and cause developmental damage during the toddler years, a new study suggests."