BOULDER, Colo. (AP) -- U.S. Rep. Jared Polis has introduced a bill that he says would close a loophole in federal law that exempts oil and gas drilling from certain provisions of the federal Clean Air Act.
The Boulder Democrat says he wants to make sure that wells drilled with a hydraulic fracturing process are not exempt from federal oversight.
Hydraulic fracturing, also known as fracking, is a gas drilling process that blasts chemical-laden water deep into the ground. Supporters say the process is safe, while opponents say the technique pollutes groundwater and the chemicals are unsafe.
There was no immediate reaction from the oil and gas industry.