Standard Interpretations - Table of Contents
• Standard Number: 1910.95

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at

March 26, 1982

Mr. Jonathan A. Jacoby
Supervisor, Industrial Hygiene
Ethyl Corporation
Toxicology and Industrial Hygiene Department
Ethyl Tower, 451 Florida
Baton Rouge, Louisiana 70801

Dear Mr. Jacoby:

This is in response to your inquiry of January 8, 1982, to Ms. Debra Feldman concerning OSHA's noise standard (29 CFR 1910.95). Please accept my apology for our delay in giving you written confirmation of the information MaryAnn Garrahan conveyed to you over the telephone on February 11, 1982.

Specifically, your question is whether the noise standard is adjusted for workshifts greater than 8 hours. The answer is no for provisions which reference Table G-16 of 1910.95, and yes whenever the standard refers to the 85 decibel (dB) time-weighted average (TWA) "action level".

Table G-16 is used for determining when engineering or administrative controls (1910.95(b)(1)) are required, and — where there is no significant threshold