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In addition to water quality issues, fracking wells release compounds into the air, such as benzene, ethylbenzene, toluene and n-hexane; long-term exposure to these has been linked to birth defects, neurological problems, blood disorders and cancer. The National Institute for Occupational Safety and Health (NIOSH) has found that workers may be exposed to dust with high levels of respirable silica during hydraulic fracturing. These findings were shared after  NIOSH studied  116 full shift air samples at 11 hydraulic fracturing sites in five states.

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