1. Regulations
  2. title 30
  3. chapter I
  4. part 57
  5. subpart D
  6. subjgrp 157
  7. § 57.5039

View all text of Subjgrp 157 [§ 57.5037 - § 57.5047]

§ 57.5039 - Maximum permissible concentration.

Except as provided by standard § 57.5005, persons shall not be exposed to air containing concentrations of radon daughters exceeding 1.0 WL in active workings.

AUTHORITY: 30 U.S.C. 811.

SOURCE: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.

CITE AS: 30 CFR 57.5039