Unsafe levels of toxic pollutants found in heavily fracked Ohio county. Emissions from fracking operations may be exposing people to some toxic pollutants at levels higher than the U.S. Environmental Protection Agency considers safe for long-term exposure, according to scientists from Oregon State University and the University of Cincinnati. The researchers took air samples in Carroll County, Ohio, where there are 480 permitted wells the most in any of the state's 88 counties. The team found chemicals released during oil and gas extraction that can raise the risk of cancer and respiratory ailments.
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