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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.

The EPA agreed, and last week ordered the Colorado Department of Public Health and the Environment to better explain why wells aren’t aggregated during the permitting process.

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