Standard Interpretations
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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.
- 1910.1018 - 8-hour total weight average (TWA) permissible exposure limit (PEL). - 10/06/1995
- 1910.1018 - Chest X-ray and sputum cytology requirements. - 08/19/1996
- 1910.1018 - Exclusion of arsenic-treated wood from OSHA's Inorganic Arsenic standard - 05/03/2023
- 1910.1018 - Protective footwear requirements for inorganic arsenic and lead. - 02/12/1993
- 1910.1018 - The inorganic arsenic standard applies to the manufacture of antimony oxide by the fuming process. - 12/05/1978
- 1910.1018(a) - Exclusion of arsenic-treated wood from OSHA's Inorganic Arsenic standard - 05/03/2023
- 1910.1018(e) - Abrasive blasting monitoring requirements and sampling procedures. - 08/13/1999
- 1910.1018(g)(2) - Notification compliance for employees exposed above inorganic arsenic PEL. - 08/04/1999
- 1910.1018(k)(2) - Use of compressed air when cleaning arsenic and lead contaminated surfaces - 03/18/1993
- 1910.1018(n)(1)(ii) - Employees must be paid for travel time for medical examination under the inorganic arsenic standard. - 04/16/1980
- 1910.1018(n)(1)(ii) - Medical examination requirements of the inorganic arsenic standard.; Respirator fit testing requirements of the inorganic arsenic standard. - 04/07/1980
- 1910.1018(n)(2)(ii)(A) - Acceptability of X-ray film size 16" X 17". - 02/16/1993
- 1910.1018(n)(2)(ii)(A) - Medical examination requirements of the inorganic arsenic standard.; Respirator fit testing requirements of the inorganic arsenic standard. - 04/07/1980