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.

Filters


Date Title Standard Number
Fast response noise dosimetry measurement not acceptable. 1910.95
Facial hair and the wearing of respirators. 1910.134
Evaluation of X-rays and pulmonary function tests for early diagnosis of lung disease. 1910.1001, 1926.1101
The use of negative-pressure air-purifying respirators for protection against paint spray containing isocyanates.
Organic lead soap containing lead naphthenate is regulated under the lead standard. 1910.1025
Federal employees' rights and reprisal protection in relation to filing safety and health complaints. 1960 - Table of Contents
OSHA/NRC Interface Activities and Related Information 1910.1096
Clarification of OSHA Instruction STD 11-11.2B as it pertains to the lifting of personnel with a jib crane. 1926.550
Requirements for fire brigade instructors.; Requirements for fire brigade instructors. 1910.156, 1910.157
Review of the QNX, Incorporated EverX sign.
Use of an electronic back-up mirror used with a with a reverse audible alarm. 1926.602(a)(9)
Update to House Subcommittee on Manpower and Housing on implementing OSHA Instruction CPL 2-2.37 1910.120
American Red Cross Standard First Aid Modular System 1910.151(b)
Review of Medic First Aid Program 1910.151(b)
Regulations for the calibration of spirometers and audiometers;Regulations for the calibration of spirometers and audiometers. 1910.1043, 1910.95
The Hornell Elektrooptick welding helmet appears to meet the intent of the OSHA standards. 1910.252
Clarification of application and requirements for unobstructed view for 1926.601(a). 1926.601(a)
Review of NASA hydrogen safety manual.; Review of NASA hydrogen safety manual. 1910.103, 1960.18
Labeling provisions in the ethylene oxide final rule will not apply where EtO is used as a pesticide. 1910.1047
Acceptable respirators for exposure to ethylene oxide; Acceptable respirators for exposure to ethylene oxide. 1910.134, 1910.1047