Sand From Fracking Could Pose Lung Disease Risk To Workers

The sand is pumped underground along with water and other chemicals to extract oil and natural gas trapped deep in rock. But researchers found that air samples taken at some drilling sites contained high enough levels of very fine silica particles to be dangerous to workers.

Source: http://www.npr.org/blogs/health/2013/03/29/175042708/Sand-From-Fracking-Operations-Poses-Silicosis-Risk?ft=1&f=100

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