DENVER (AP) – Some Colorado legislators want a new state health department study on the potential health risks of the oil and gas industry, saying an earlier assessment that found low risk was inadequate.

Eighteen Democratic lawmakers wrote a letter to health department Director Dr. Larry Wolk criticizing the earlier assessment as narrow and incomplete. They also said it had a “dismissive tone.”

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The letter was dated April 4 and made public Tuesday.

The March assessment concluded the risk of harmful human effects appears to be low but stressed more study was needed. It reviewed a dozen earlier studies and thousands of air samples.

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Wolk had no immediate comment.

The letter didn’t address how a second study would be paid for.

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