"CORPUS CHRISTI, Texas -- A South Texas judge has fined Citgo Petroleum more than $2 million after finding it guilty of felony violations of the U.S. Clean Air Act by its Corpus Christi refinery."

"SALT LAKE CITY -- Using the momentum of a growing number of Utah residents who are dissatisfied with the unhealthy haze hanging over the Wasatch Front, clean-air advocates rallied in modern-day record fashion Saturday to ensure they are heard by Gov. Gary Herbert and state lawmakers."

"California Governor Jerry Brown declared a drought emergency on Friday, a move that will allow the parched state to seek federal aid as it grapples with what could turn out to be the driest year in recorded state history for many areas."

"Air district officials filed a lawsuit Thursday seeking up to $40 million from a Vernon battery recycler accused of posing a health risk for emitting too much lead and arsenic."

"The Environmental Protection Agency will finally publish notice of new proposed rules limiting greenhouse gas emissions from new power plants on Wednesday, more than three months after announcing the rules last September."

"The U.S. government is planning stricter controls on exposure to silica, a carcinogen found in workplaces ranging from dentist's offices to granite quarries, according to a new report."

"LOUISVILLE, Ky. -- A group of Louisville residents who say coal ash from a nearby power plant drifts into their lungs and homes have sued the utility company."

"Chinese authorities have told pilots who fly to Beijing they must be qualified to land their aircraft in the low visibility bought about by smog -- the latest missive related to the capital's heavy air pollution, which the government this week lauded as a beneficial shield against missile attacks."