---
kind: "section"
citation: "10 C.F.R. § 850.23"
title: "10"
number: "850.23"
heading: "Action level."
url: "https://uscodex.org/cfr/10/850.23"
---

# §850.23. Action level.

- (a) The responsible employer must include in its CBDPP an action level that is no greater than 0.2 µg/m 3, calculated as an 8-hour TWA exposure, as measured in the worker's breathing zone by personal monitoring.
- (b) If an airborne concentration of beryllium is at or above the action level, the responsible employer must implement [§§ 850.24(c)](/cfr/10/850.24.md?p=c) (periodic monitoring), 850.25 (exposure reduction and minimization), 850.26 (regulated areas), 850.27 (hygiene facilities and practices), 850.28 (respiratory protection), 850.29 (protective clothing and equipment), and 850.38 (warning signs) of this part.

## Notes

### Authority

Authority: 42 U.S.C. 2201(i)(3), (p); 42 U.S.C. 2282c; 29 U.S.C. 668; 42 U.S.C. 7101 et seq.; 50 U.S.C. 2401 et seq., E.O. 12196, 3 CFR 1981 comp., at 145 as amended.

### Source

Source: 64 FR 68905, Dec. 8, 1999, unless otherwise noted.