30 C.F.R. § 70.100 Respirable dust standards.
Title 30 - Mineral Resources
(a) Each operator shall continuously maintain the average concentration of respirable dust in the mine atmosphere during each shift to which each miner in the active workings of each mine is exposed at or below 2.0 milligrams of respirable dust per cubic meter of air as measured with an approved sampling device and in terms of an equivalent concentration determined in accordance with §70.206 (Approved sampling devices; equivalent concentrations). (b) Each operator shall continuously maintain the average concentration of respirable dust within 200 feet outby the working faces of each section in the intake airways at or below 1.0 milligrams of respirable dust per cubic meter of air as measured with an approved sampling device and in terms of an equivalent concentration determined in accordance with §70.206 (Approved sampling devices; equivalent concentrations).
Title 30: Mineral Resources
PART 70—MANDATORY HEALTH STANDARDS—UNDERGROUND COAL MINES
Subpart B—Dust Standards
§ 70.100 Respirable dust standards.
