During procedures like sandblasting and fracking, large quantities of silica particles can be released into the air. They can lodge deep in the lung, setting off processes that can lead to lung cancer as well as kidney disease, in addition to silicosis. Companies will be required, among other measures, to keep records of employee exposure to silica and to provide a medical exam every three years to each worker whose level of exposure is high enough to require wearing a protective respirator.
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