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
OSHA requires a minimum of 2 and at least 10% blanks be taken for all samples regardless of purpose. 1910.1001 App A, 1926.1101 App A, 1915.1001 App A
Red Baron Negative Air Enclosure System 1926.58(e)(6)
Interim response to the intent of "advance first-aid" mentioned in 1910.120(q)(3)(vi). 1910.120(q)(3)(vi)
Flammable and Combustible liquids. 1910.106
Concerning the new lockout/tagout standard. 1910.147
Respirators required during initial hazardous waste site entry 1910.120(c)(4)(ii), 1910.120(g), 1910.134
Clarification of 29 CFR 1910.1047(h)(2) Requirements for Emergency EtO Limit 1910.1047
The use of flammable and combustible liquids in dip tanks. 1910.106, 1910.123, 1910.124, 1910.125, 1910.126
Training requirements in 29 CFR 1910.120 concerning hazardous waste cleanup operations. 1910.120, 1910.120(e)
Occupational injury statistics relating to cumulative trauma disorders.
Interpretation of OSHA's Fire Brigade Standard concerning the use of SCBAs by incipient stage fire brigade members 1910.155(c)(26), 1910.156
Answers to questions regarding the training requirements of 1910.120 1910.120, 1910.1200
Acceptability of annual inspections of bakery ovens by Bakery Services Inc. 1910.263
Application of 1910.120 to cleanup of nuclear and hazardous waste 1910.120
Letter to Diesel Fuel Manufacturers 1910.1200
Effectiveness of the Glove Box for removal of asbestos-containing pipe insulation. 1926.1101(g)(5)(iv)
Hazard Communication Standard. 1910.1200
Workplace standards establishing what concentration of tobacco smoke is "too much."
Underground Storage Tanks 1910.120
Use of resheathing instruments or forceps is permitted for recapping of needles