ACGIH TLVs (Threshold limit values) and BEIs (Biological exposure indices)

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This publication covers evaluating and controlling workplace exposures to chemical substances and physical agents. It provides Threshold Limit Value (TLV®) occupational guidelines for more than 700 chemical substances and physical agents and more than 50 Biological Exposure Indices (BEIs®). The publication lists Chemical Abstract Service (CAS) registry numbers for each chemical.

Current edition

2023 TLVs® and BEIs®

Incorporation by reference

The following editions have been incorporated by reference (IBR) into the Code of Federal Regulations (CFR):

IBR approved for	Overview of requirements	IBR approved edition
29 CFR 1910.120(a)(3) and 29 CFR 1926.65(a)(3)	Published exposure level means the exposure limits published in “NIOSH Recommendations for Occupational Health Standards” dated 1986, or if none is specified, the exposure limits published in the standards specified by the American Conference of Governmental Industrial Hygienists in their publication “Threshold Limit Values and Biological Exposure Indices for 1987–88” dated 1987.	Threshold Limit Values and Biological Exposure Indices for 1986-87 (1986).
29 CFR 1915.1000 Table Z	Polytetrafluoroethylene decomposition products. Because these products decompose in part by hydrolysis in alkaline solution, they can be quantitatively determined in air as fluoride to provide an index of exposure. No TLV is recommended pending determination of the toxicity of the products, but air concentrations should be minimal. Gasoline and/or Petroleum Distillates. The composition of these materials varies greatly and thus a single TLV for all types of these materials is no longer applicable. The content of benzene, other aromatics and additives should be determined to arrive at the appropriate TLV. Simple asphyxiants. The limiting factor is the available oxygen which shall be at least 18% and be within the requirement addressing explosion in subpart B of part 1915.	Threshold Limit Values of Airborne Contaminants for 1970 (1970).
29 CFR 1926.55 Table 1	Polytetrafluoroethylene decomposition products. Because these products decompose in part by hydrolysis in alkaline solution, they can be quantitatively determined in air as fluoride to provide an index of exposure. No TLV is recommended pending determination of the toxicity of the products, but air concentrations should be minimal. Gasoline and/or Petroleum Distillates. The composition of these materials varies greatly and thus a single TLV for all types of these materials is no longer applicable. The content of benzene, other aromatics and additives should be determined to arrive at the appropriate TLV. Simple asphyxiants. The limiting factor is the available oxygen which shall be at least 19.5% and be within the requirements addressing explosion in part 1926.	Threshold Limit Values of Airborne Contaminants for 1970 (1970).

How to purchase

Standards are available for purchase from the American Conference of Governmental Industrial Hygienists (ACGIH), see www.acgih.org.