30 CFR 75.321 - Air quality.

§ 75.321 Air quality.


(1) The air in areas where persons work or travel, except as specified in paragraph (a)(2) of this section, shall contain at least 19.5 percent oxygen and not more than 0.5 percent carbon dioxide, and the volume and velocity of the air current in these areas shall be sufficient to dilute, render harmless, and carry away flammable, explosive, noxious, and harmful gases, dusts, smoke, and fumes.

(2) The air in areas of bleeder entries and worked-out areas where persons work or travel shall contain at least 19.5 percent oxygen, and carbon dioxide levels shall not exceed 0.5 percent time weighted average and 3.0 percent short term exposure limit.

(b) Notwithstanding the provisions of § 75.322, for the purpose of preventing explosions from gases other than methane, the following gases shall not be permitted to accumulate in excess of the concentrations listed below:

(1) Carbon monoxide (CO) - 2.5 percent

(2) Hydrogen (H2) - .80 percent

(3) Hydrogen sulfide (H2 S) - .80 percent

(4) Acetylene (C2 H2) - .40 percent

(5) Propane (C3 H8) - .40 percent

(6) MAPP (methyl-acetylene-propylene-propodiene) - .30 percent

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.

United States Code

Title 30 published on 06-Jun-2018 04:01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 30 CFR Part 75 after this date.

  • 2018-03-26; vol. 83 # 58 - Monday, March 26, 2018
    1. 83 FR 12904 - Exposure of Underground Miners to Diesel Exhaust
      GPO FDSys XML | Text
      DEPARTMENT OF LABOR, Mine Safety and Health Administration
      Request for information; reopening of the rulemaking record for public comments.
      The comment period for the request for information, published on June 8, 2016 (81 FR 36826), which closed on January 9, 2018 (82 FR 2284), is reopened. Comments must be received on or before midnight Eastern Standard Time on March 26, 2019.
      30 CFR Parts 57, 70, 72, and 75