Sources: Occupational Safety and Health Administration; CP staff
As indicated in initial proposals to revise and harmonize respirable silica dust thresholds for general industry and construction worksites, OSHA maintains limits—25 and 50 micrograms per cubic meter of air, averaged over an eight-hour shift—for action levels and offering workers medical surveillance, respectively, in its final Occupational Exposure to Respirable Crystalline Silica rule.
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