§ 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/m 3 for a full-shift exposure, calculated as an 8-hour TWA.
Daily eCFR
§ 60.10 Permissible exposure limit (PEL).
30 CFR 60.10