"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."

"Eight-month investigation reveals that the Texas State Legislature is more intent on protecting the industry than protecting residents' health."

"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."