"CLEVELAND — A study in a rural Ohio county where oil and gas drilling is booming found air pollution levels near well sites higher than those in downtown Chicago.

A team from the University of Cincinnati and Oregon State University placed 25 monitors as close as one-tenth of a mile from gas wells in Carroll County, about 100 miles south of Cleveland. The monitoring occurred over a three-week period in February.

The monitors detected 32 types of hydrocarbon-based compounds, some of which are found in vehicle exhaust, tobacco smoke and are produced when materials are burned."

Mark Gillispie reports for the Associated Press October 21, 2014. [2]