- Associated Press - Tuesday, June 14, 2016

DENVER (AP) - A study of air pollution from western Colorado fracking wells found the highest rate of emissions came just after fracking was completed.

The research released Tuesday didn’t measure the effects on human health, but it will help state officials devise such a study later.

Fracking, or hydraulic fracturing, uses pressurized water, sand and chemicals to break open underground formations and release oil and gas.

The study looked at methane and ozone-causing compounds released from new fracking wells.

Jeff Collett, a professor of atmospheric science at Colorado State University, said the study found the emissions rate was highest when gas began to flow from the well, pushing the water and chemicals back out.

The $1.7 million study was funded by Garfield County and drilling companies. Collett discussed it with county commissioners Tuesday.

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