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WELD COUNTY, Colo. — The Environmental Protection Agency, , along with the Colorado Department of Public Health and Environment, filed a lawsuit against PDC Energy, alleging widespread air pollution in northern Colorado.

According to the lawsuit, the accusation centers around 86 sites in the Wattenberg Field, an area north of Denver and south of Greeley prone to oil and gas development.

Weld and Adams counties appear to the locations directly impacted.

The lawsuit, filed in federal court earlier this week, seeks damages of up to $110,000 per day of violation. The EPA alleges the locations released “volatile organic compounds” into the air.

“We’re obviously very disappointed with today’s filing as we have been in continuous discussions with the EPA, DOJ and State of Colorado for over a year,” PDC Energy president and CEO Bart Brookman said in a statement.

“Since the company’s original disclosure of this matter in November 2015, we have worked diligently to design, maintain and operate our production facilities in compliance with the guidelines of not only the Clean Air Act, but all relevant regulations.”

An email asking for specific examples of changes was not returned.