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 Subpart Z - Determining whether an aircraft fuel tank is considered a confined space. - 03/05/2008
- 1910 Subpart Z - Method for exposure compliance determination for substances regulated under Subpart Z. - 05/23/1985
- 1910 Subpart Z - OSHA policy regarding PEL adjustments for extended work shifts. - 11/10/1999
- 1910 Subpart Z - Response to a request regarding remedies for airborne pollutants. - 10/30/1987