Fracking waste fluid often contains extremely high levels of benzene. Levels of benzene 700 times the federal standard have been found in fracking waste fluid. A study by the National Institute of Occupational Safety and Health has detected benzene in the urine of well pad workers (at levels known to raise risks for leukemia), in private drinking water wells contaminated by fracking operations, and in ambient air at nearby residences. The National Cancer Institute considers benzene to be such a potent carcinogen that there is no safe exposure level.
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