On August 23, 2013, OSHA issued an Advance Notice of Proposed Rulemaking designed to reduce the permissible exposure limit (PEL) associated with silica dust exposure. OSHA is proposing a new PEL for respirable crystalline silica (quartz, cristobalite, and tridymite) of 50 µg/m3 in the general industry, construction, and shipyard sectors, a standard anywhere from two to five times more stringent than current PELs that date back to 1971.
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