StacksVerified U.S. regulatory reference

30 CFR §60.10

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.