"Air pollution kills about 7 million people worldwide every year, with more than half of the fatalities due to fumes from indoor stoves, according to a new report from the World Health Organization published Tuesday."

"CDC review of seven studies involving over 8,000 children suggests a link between childhood leukemia and exposure to high levels of auto exhaust. Direct cause-effect needs more study, researchers say."

"Dark clouds of soot and gases spewed by tractors, bulldozers and backhoes are becoming a thing of the past under new federal standards that have forced cleaner diesel engines this year."

"Paris enjoyed a rare reprieve from traffic jams Monday as a draconian clampdown on cars, aimed at banishing stubborn levels of smog, took effect."

Eighteen coal facilities in Ohio are operating with expired pollution-discharge permits under an agency where allegations of coal-industry influence arose during a personnel flap last year, an Associated Press review has found.

"Scientists have found four new ozone-destroying gases in the atmosphere, most likely put there by humans in the last 50 years, despite a ban on these dangerous compounds."

"A dozen years ago, neighborhoods around Riverside, an hour’s drive east of Los Angeles, had the nation’s worst soot: Every three days, on average, the air was declared unhealthful, and people were breathing twice as many microscopic particles as deemed safe."

"ST. LOUIS — A national environmental group has made good on its promise to sue a St. Louis-based utility regarding what it calls thousands of violations of federal clean air laws."

"The Obama administration on Monday announced new fuel and automobile rules to cut soot, smog and toxic emissions, which it says will reduce asthma and heart attacks in the United States."

"WASHINGTON — The Environmental Protection Agency plans to unveil a major new regulation on Monday that forces oil refiners to strip out sulfur, a smog-forming pollutant linked to respiratory disease, from American gasoline blends, according to people familiar with the agency’s plans."