Given the silica content of concrete and mortar, silicosis is an enduring scourge of concrete and masonry construction. The damaging effects of ongoing exposure to airborne silica were familiar even ...
Reduces the permissible exposure limit (PEL) for respirable crystalline silica to 50 micrograms per cubic meter of air, averaged over an 8-hour shift (previous limit was 250 micrograms). Requires ...
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