"WASHINGTON -- A dozen states and cities and three major environmental groups have notified the Environmental Protection Agency that they plan to sue the regulator unless it issues final rules limiting greenhouse gas emissions from new power plants."

"You might have been wondering whether the Obama administration was going to impose the first-ever greenhouse gas limits on new power plants, since the deadline is April 13."

"SAN PEDRO, Calif. -- If there's a computer on your desk, a Sony television in your den or a pair of Nike sneakers on your feet, you're connected to Pier 400 at the Port of Los Angeles here."

"WASHINGTON -- The Environmental Protection Agency's latest proposed tightening of limits on sulfur in gasoline, and its previous rules, will most likely have the perverse consequence of retarding the development of cars running on batteries, advanced biofuels or hydrogen -- all promising but expensive technologies that have not become mass-market products."

"A coalition of environmental groups wants air-quality officials to determine if the refining of heavy Canadian crude has an effect on local health and safety."

"SPRINGFIELD, Ill. -- Dominion Energy has agreed to pay a $3.4 million civil penalty and spend $9.75 million on environmental mitigation projects to resolve Clean Air Act violations at coal-fired power plants in three states."

"A federal jury on Thursday found Tonawanda Coke Corp, accused of years of illegal air pollution, guilty of violating federal clean air regulations and found its environmental manager guilty of hiding plant deficiencies from U.S. regulators."

"WASHINGTON -- The U.S. Supreme Court on Monday rejected a challenge by the oil lobby disputing a U.S. Environmental Protection Agency air pollution rule."

"Despite some lingering anger over wood-burning rules, Bay Area air quality officials say a five-year burn ban has paid off for the region's 7 million residents."

"TRAVERSE CITY, Mich. — Government regulators can try to halt construction projects at power plants if they think the companies didn't properly calculate whether the changes would increase air pollution, a federal appeals court ruled Thursday, marking the latest twist in a decades-long fight over the Clean Air Act."