Letters of Interpretation

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.

These letters of interpretation and the standards they address may not apply to OSHA State Plans. State Plans are required to have standards and enforcement programs that are at least as effective as OSHA's and may have different or additional requirements. Please see OSHA-approved State Plans for more information.

NOTICE:

How to Request a Letter of Interpretation

Filters


Date Title Standard Number
Sampling for benzidine congener dyes 1910.1010
The proper handling of compressed gas cylinders particularly with reference to the moving of cylinders from place to place. 1910.101
Above ground gas transmission and distribution piping systems. 1910.101
Medical surveillance requirements in the vinyl chloride standard. 1910.1017
Applicable regulations to the Nupro 316-DC-RD cylinder valve 1910.101
Labeling requirements for containers of polyvinyl chloride. 1910.1017(l)(4), 1910.1017(b)(6), 1910.1200
Potentially Hazardous Amine Absorber Pressure Vessels Used in Refinery Processing 1910.101
Definitions of "massive release", "equipment failure", and "emergency" under the vinyl chloride standard. 1910.1017
Standard applicable to two point suspension scaffolds and power platforms used in window cleaning and to hazards in refrigeration plants. 1910.28, 1910.66, 1910.22, 1910.38, 1910.95, 1910.101, 1910.111, 1910.151, 1910.212, 1910.39
Gloves are required for employees handling chloropicrin; Arsenic containing pesticides and wood preservatives are not within the scope of the inorganic arsenic standard. 1910.132, 1910.1018
Carcinogen standards requirements for fume hood face velocities do not apply to laboratories. 1910.1003, 1910.1016
Signs and protective equipment requirements for a vinyl chloride hazardous operation. 1910.1017(b)(7)
Definition of "massive release" of vinyl chloride. 1910.1017(b)(5)
Employees must be paid for travel time for medical examination under the inorganic arsenic standard. 1910.1018(n)(1)(ii)
Medical examination requirements of the inorganic arsenic standard.; Respirator fit testing requirements of the inorganic arsenic standard. 1910.1018(n)(1)(ii), 1910.1018(n)(2)(ii)(A)
Initial monitoring and labelling for inorganic arsenic is not required when exposure could not be above the action level. 1910.1018, 1910.1018(b)
The inorganic arsenic standard applies to the manufacture of antimony oxide by the fuming process. 1910.1018
Applicability of the inorganic arsenic standard to operations involving chromated copper arsenate (CCA) wood preservative. 1910.1018
"Massive release" is defined as gaseous vinyl chloride escaping under positive pressure; Clarification of the term "hazardous release";Clarification of protective clothing required to respond to a vi 1910.1017(b)(5), 1910.1017(i)(1), 1910.1017(h)
Newly Developed Hydrogen Storage Cylinders. 1910.101