[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR70.100]

[Page 421]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 70--MANDATORY HEALTH STANDARDS--UNDERGROUND COAL MINES--Table of Contents
 
                        Subpart B--Dust Standards
 
Sec. 70.100  Respirable dust standards.

    Authority: Secs. 101 and 103(h), Federal Mine Safety and Health Act 
of 1977, Pub. L. 91-173 as amended by Pub. L. 95-164, 91 Stat. 1291 and 
1299 (30 U.S.C. 811 and 813(h)).

    Source: 45 FR 24001, Apr. 8, 1980, unless otherwise noted.


    (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 Sec. 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 Sec. 70.206 (Approved sampling devices; equivalent 
concentrations).