OSHA proposes to halve and harmonize silica exposure thresholds

Sources: Occupational Safety and Health Administration; CP staff

In Notice of Proposed Rulemaking (NPRM) for Occupational Exposure to Respirable Crystalline Silica, OSHA outlines reduction of permissible exposure limits (PEL) for quartz from current general industry and construction thresholds—100 and 250 micrograms per cubic meter of air (μg/m3) expressed in eight-hour weighted averages, respectively—to a uniform 50 μg/m3.

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