"OTTAWA — The Harper government’s budget cuts to scientific research at Environment Canada have compromised the department’s capacity to crack down on cancer-linked pollution and its mandate to enforce clean air regulations, say enforcement officers in a collection of internal emails obtained by Postmedia News."

"The Obama administration is leaning toward revising its landmark proposal to regulate greenhouse gas emissions from new power plants, according to several individuals briefed on the matter, a move that would delay tougher restrictions and could anger many environmentalists."

"BILLINGS, Mont. -- Environmental groups filed a federal lawsuit Wednesday against the owners of Montana's massive Colstrip coal-fired power plant, seeking to force the installation of more pollution controls at the decades-old facility."

"War has erupted between clean-air activists and state leaders, with the battleground being the data driving decisions about Utah’s air quality."

"One of the the nation’s largest utilities agreed Monday to close three of its coal-fired power plants as part of a settlement with government officials and environmental groups, the latest sign of how the nation’s electricity supply is shifting away from coal."

"NORTH POLE, Alaska — In Krystal Francesco's neighborhood, known here as the 'rectangle of death,' the air pollution recently was so thick she could hardly see across the street. Wood stoves were cranking all over town — it was 40 below zero — and she had to take her daughter to the emergency room."

"OAKLAND -- The pediatric inpatient unit was quiet, except for the deep, relentless coughing. It was the sound of asthma -- asthma out of control."

"Officials are alarmed at the lack of awareness about the invisible gas that invades homes."

"Greenhouse gas emissions from U.S. power plants fell 4.6 percent in 2011 as more generators were switched to cleaner-burning natural gas and renewable sources from coal, according to new data from the Environmental Protection Agency."

"BRUSSELS -- Long-term exposure to fine particles of pollutants in the air can trigger adverse birth outcomes, childhood respiratory diseases and atherosclerosis, the World Health Organization warned today.