30 CFR § 60.10
Permissible exposure limit (PEL)
May 28, 2026
§ 60.10 Permissible exposure limit (PEL).
The mine operator shall ensure that no miner is exposed to an airborne concentration of respirable crystalline silica in excess of 50 µg/m3 for a full-shift exposure, calculated as an 8-hour TWA.
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