Ozone levels exceeded the U.S. Environmental Protection Agency limit on 13 days in February and March. Preliminary data show ozone levels topped the worst readings in many large U.S. cities all last year. The Upper Green River Basin is one of the nation's top gas-producing areas. Gas producers say they've taken steps to reduce the air pollution that causes wintertime ozone under conditions that include bright sunshine and snow on the ground.From American Public Media's Marketplace:
A study out this week says the carbon footprint of clean-burning natural gas is bigger than coal's because extracting gas releases methane.