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The U.S. Environmental Protection Agency has ordered Colorado’s state health department to respond to an air-pollution complaint filed by Rocky Mountain Clean Air Action.
The environmental group opposed the state’s recent permitting of 3,600 gas wells north of Denver — wells that are owned and operated by Anadarko Petroleum, formerly Kerr- McGee Oil and Gas.
Individually, the gas wells don’t emit enough pollution to trigger much state regulation, but considered in aggregate, they contribute significant amounts of haze-forming chemicals, Clean Air argued.



