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.

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How to Request a Letter of Interpretation

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Date Title Standard Number
IDLH values. 1910.120, 1926.65
Bloodborne Pathogens Standard at the Institutions. 1910.1030
OSHA Guidelines for Medical Practices. 1910.1030
The work practices of truck drivers at loading docks. 1910.178
Information on temporary workers, particularly those in the electronic assembly industry. 1926.20, 1926.21, 1910.1200, 1926.59
Information on temporary workers in the electronic assembly industry and office workers. 1910.1200, 1926.59
Joint Investigations with EPA.
Permanent Variance Requirements for Self-Feed Circular Ripsaws. 1910.213
OSHA's Permit-required Confined Spaces Standard. 1910.146
The "gas caddy" and OSHA's Flammable and Combustible Liquids Standard. 1910.106
Conveyor Crossover Stile. 1905.10, 1905.11, 1905.12, 1905.13, 1905.14, 1905.15, 1905.16, 1910.23, 1910.27
Tuberculosis: respiratory protection and complaint inspection. 1910.134
Training requirements under the HAZWOPER standard. 1910.120
The Use of the Bullard "Free Air" Pump. 1910.134
Hazards of Smoke Generated from Surgical Procedures 1910.1030
OSHA Injury and Illness Recordkeeping Interpretations. 1904 - Table of Contents
OSHA Injury and Illness Recordkeeping Interpretations. 1904 - Table of Contents
OSHA injury and illness recordkeeping interpretations. 1904 - Table of Contents
Deletion of non-recordable and changed case entries from the OSHA 200 log. 1904 - Table of Contents
Definition and determination of work related injuries and illnesses. 1904 - Table of Contents