['Specialized Industries']

['Mining']

07/19/2025

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§70.100 Respirable dust standards.

...

§70.100 Respirable dust standards.

RegSense CFR Regulations Mining Specialized Industries CFR Section English Focus Area USA

(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, as measured with an approved sampling device and expressed in terms of an equivalent concentration, at or below:

(1) 2.0 milligrams of respirable dust per cubic meter of air (mg/m³).

(2) 1.5 mg/m³ as of August 1, 2016.

(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 as measured with an approved sampling device and expressed in terms of an equivalent concentration at or below:

(1) 1.0 mg/m³.

(2) 0.5 mg/m³ as of August 1, 2016.

[79 FR 24973, May 1, 2014]

['Specialized Industries']

['Mining']

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