Standard Interpretations
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. Each 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.
- 1910.1045 - 8-hour total weight average (TWA) permissible exposure limit (PEL). - 10/06/1995
- 1910.1045 - Use of amyl nitrite pearls as an antidote for acrylonitrile poisoning. - 02/18/1987
- 1910.1045(m)(2) - Showering requirements of the acrylonitrile standard - 02/17/1982
- 1910.1045(n)(2)(iii) - Acceptability of X-ray film size 16" X 17". - 02/16/1993