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Conservation and public-health groups filed a petition urging the Environmental Protection Agency to require adequate testing of the toxic air pollution emitted by four oil and gas well pads owned and operated by the Bonanza Creek Energy Operating Company. New permits for the facilities fail to require adequate testing of flares used to burn off toxic pollution, according to the petition filed Monday by the Center for Biological Diversity, Public Employees for Environmental Responsibility, 350 Colorado, Sierra Club and GreenLatinos. The pollutants released by the facilities include volatile o...

Two environmental groups sued the Environmental Protection Agency over what they say is a failure to make sure Colorado is cleaning up its polluted air.

The Environmental Protection Agency’s approval of Colorado’s plans to tackle ozone pollution is again being challenged in court by environmental groups, who say state and federal officials are failing to

Two environmental groups sued the Environmental Protection Agency over what they say is a failure to make sure Colorado is cleaning up its polluted air.

A federal appeals court today rejected an attempt by commissioners in Colorado’s Weld County to let some oil and gas operations off the hook for their contribution to asthma-causing smog in the Denver and Front Range region. The U.S. Court of Appeals for the D.C. Circuit ruled that the Environmental Protection Agency properly included northern Weld County in the smog clean-up zone. Today’s decision confirms that companies operating thousands of oil and gas wells in the area must reduce ozone pollution known to be a major cause of the region’s chronic smog problem.