Standard Interpretations
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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.
- 1910.1000 - 8-hour total weight average (TWA) permissible exposure limit (PEL). - 10/06/1995
- 1910.1000 - Advertisement on cleaning up mercury spills from glass thermometers - 07/10/1987
- 1910.1000 - Allowable Airborne Concentrations of Mercury - 06/30/1976
- 1910.1000 - An error in the 1910.1000 Z-Tables. - 05/01/1995
- 1910.1000 - Applicable OSHA standards and safety considerations for microwave device use in a laboratory - 08/08/2002
- 1910.1000 - Application of OSHA PEL for nitric oxide as 8-hr TWA to pregnant employees. - 05/19/2009
- 1910.1000 - Appropriate air sampling methods for copper and zinc oxide. - 04/01/1999
- 1910.1000 - Clarification of minimum face velocity requirements for spray booths - 10/22/2001
- 1910.1000 - Clarification of requirements for storage and use of flammable and/or combustible liquids. - 12/26/2007
- 1910.1000 - Clarification on the applicability of the Hazard Communication standard DEF tank operations. - 12/20/2011
- 1910.1000 - Compliance and Enforcement Activities affected by the PELs Decision. - 08/05/1993
- 1910.1000 - Cyanide Antidotes - 03/31/2020
- 1910.1000 - Enforcement of the Chromate and Chromic Acid PEL - 04/08/1991
- 1910.1000 - Explanation of OSHA's determination of the PEL for amorphous silica. - 03/22/2007
- 1910.1000 - Exposure limits and symptoms of Hydroquinone, acetic acid, and glutaraldehyde exposure. - 11/13/1998
- 1910.1000 - Exposures to polychlorinated biphenyls (PCB's) in lighting equipment. - 03/11/1993
- 1910.1000 - Field extraction procedure for isocyanate air samples - 02/21/2014
- 1910.1000 - General overview of safe handling of arsenic containing compounds. - 06/03/1985
- 1910.1000 - Hazardous components of diesel engine emissions. - 11/08/1985
- 1910.1000 - Hazardous exposures to pesticides may be cited under the general duty clause. - 05/31/1983
- 1910.1000 - Hierarchy of controls for exposure to air contaminants - 06/24/2002
- 1910.1000 - Information on hazards of dry photocopiers - 10/10/1984
- 1910.1000 - Inquiry on monitoring device for cigarette smoke in buildings. - 03/03/1988
- 1910.1000 - Metal cyclones Supplied by SKC Inc. are not to be used for sampling respirable dust. - 02/21/1989
- 1910.1000 - Nuisance dust standard applies to grain dust exposures. - 10/04/1983
- 1910.1000 - Occupational health hazards to veterinarians. - 04/27/1994
- 1910.1000 - Occupational Safety and Health Administration's (OSHA) regulations for ozone. - 09/29/1994
- 1910.1000 - OSHA standards do not include surface contamination criteria or quantifications for skin absorption - 06/21/1985
- 1910.1000 - OSHA's position on employer performing additional air monitoring that exceeds OSHA requirements. - 09/16/2008
- 1910.1000 - OSHA's regulations for chemicals used in the workplace, and in particular, glutaraldehyde. - 05/15/1997
- 1910.1000 - Permissible Exposure Limits for Nuisance dust. - 05/15/1997
- 1910.1000 - Petroleum asphalt removed from coverage under the Coal Tar Pitch Volatiles Standard - 04/08/1983
- 1910.1000 - Railroad workers and their exposure to crystalline silica. - 08/20/1996
- 1910.1000 - Regulating employee exposure to wood dust - 06/06/1989
- 1910.1000 - Regulations For Cotton Waste Operations - 05/10/1991
- 1910.1000 - Request for a list of all OSHA-regulated air contaminants. - 03/22/1995
- 1910.1000 - Request for a regulatory clarification concerning commercial carbon black. - 02/21/1989
- 1910.1000 - Response to a request for information concerning the OSHA standard for carbon monoxide. - 02/25/1988
- 1910.1000 - Special emphasis program for silicosis. - 03/27/1998
- 1910.1000 - Spray painting relating to vehicle maintenance operations. - 07/28/1992
- 1910.1000 - Status and applicability of Thiram standards in Washington and Oregon. - 01/24/1983
- 1910.1000 - The appropriate method for assessing hydrogen sulfide peak exposure levels - 09/28/1995
- 1910.1000 - Use of IOM sampler for inhalable dust. - 11/08/2011
- 1910.1000 - Variance exposure level for silver metal. - 05/15/1996
- 1910.1000 - Ventilation for an anhydrous ammonia refrigeration system. - 06/13/1990
- 1910.1000 - Wood dust sampling - 04/22/1993
- 1910.1000 - Worker exposure to tobacco smoke. - 10/26/1998
- 1910.1000 TABLE Z-2 - Compliance and Enforcement Activities affected by the PELs Decision. - 08/05/1993
- 1910.1000 TABLE Z-2 - Exemption under the benzene standard for oil and gas drilling operations. - 01/17/2002
- 1910.1000 TABLE Z-2 - PEL for inorganic mercury is a time weighted average, not a ceiling - 09/03/1996
- 1910.1000 TABLE Z-2 - Request for a list of all OSHA-regulated air contaminants. - 03/22/1995
- 1910.1000 TABLE Z-2 - Standards applicable to Epon 826, 827, and Epon Curing Agent Z. - 01/18/1988
- 1910.1000 TABLE Z-2 - The PEL for cadmium at dry color formulator operations. - 10/15/1999
- 1910.1000 TABLE Z-3 - Compliance and Enforcement Activities affected by the PELs Decision. - 08/05/1993
- 1910.1000 TABLE Z-3 - OSHA currently has no enforceable standard for paper dust. - 05/04/1987
- 1910.1000 TABLE Z-3 - Request for a list of all OSHA-regulated air contaminants. - 03/22/1995
- 1910.1000 TABLE Z-3 - Requirements for maintaining Material Safety Data Sheets (MSDSs) for coal including coal dust, fly ash, and silica dust. - 04/27/2005
- 1910.1000 TABLE Z-3 - Standards applicable to Epon 826, 827, and Epon Curing Agent Z. - 01/18/1988
- 1910.1000 TABLE Z-3 - Use of silica as an abrasive blaster. - 02/11/1986
- 1910.1000(c) - OSHA's position on the risk associated with asbestos exposure at the current PEL. - 05/13/1999