"In a win for the U.S. Environmental Protection Agency, the Supreme Court on Monday agreed to consider the legality of a controversial Obama administration effort to regulate air pollution that crosses state lines."

"Kish, the visible form of mill's pollution, 'invaded' homes, leaving residents to worry about health effects."

"TAYLORVILLE, Ill. -- A Nebraska company dropped plans to build a $3.5 billion coal-based power plant in central Illinois, saying it instead will focus on developing natural gas-fueled and renewable facilities elsewhere."

"Haze from fires in Indonesia blanketing Singapore could persist for weeks or longer, Prime Minister Lee Hsien Loong said on Thursday, as the smoke drove air quality to "hazardous" levels and disrupted business and travel in the region."

"HONG KONG -- China’s cabinet has adopted 10 measures to improve air quality in the latest move aimed at responding to the dense smog that has repeatedly enveloped Beijing and other major Chinese cities in recent years."

"BALTIMORE, Md. -- Gov. Martin O'Malley has interceded with the U.S. Environmental Protection Agency on behalf of Carnival Cruise Lines after the company threatened to pull its business from Baltimore over a pending air-quality regulation that would require large, ocean-going ships to burn cleaner fuel."

"GE Energy Services' coal-fired power plant in Homer City will be required to meet federal standards for emissions of sulfur dioxide that are more protective of human health."

"The Houston area produces about a quarter of the nation's gasoline, and about a third of the plastics that are in our cars, cupboards and just about everywhere else. So it is no surprise that this heavily industrial area has a problem with air pollution. But in the past decade, Houston's air has improved dramatically."

"Federal judges [Tuesday] rejected challenges from both industry and environmental groups to U.S. EPA's air standards for lead smelters."

"Denise Mauzerall arrived in Beijing this year at a time that was both horrifying and illuminating. The capital was facing some of its worst pollution in recent memory and Mauzerall, a Princeton environmental engineering professor, was passing through on her way to a university forum on the future of cities."