---
kind: "section"
citation: "46 C.F.R. § 197.515"
title: "46"
number: "197.515"
heading: "Permissible exposure limits (PELs)."
url: "https://uscodex.org/cfr/46/197.515"
---

# §197.515. Permissible exposure limits (PELs).


The permissible exposure limits (PELs) for personal exposure are as follows:

- (a) **The time-weighted average exposure limit (TWA).**
- (b) **The short-term exposure limit (STEL).** Exposures at the STEL must not be repeated more than four times a day. There must be at least 60 minutes between successive exposures at the STEL.

## Notes

### Source

Source: CGD 88-040, 56 FR 52135, Oct. 17, 1991, unless otherwise noted.

### Authority

Authority: 33 U.S.C. 1509; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703, 6101; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 76-009, 43 FR 53683, Nov. 16, 1978, unless otherwise noted.