BEI Under Study

Chemical Substances and Other Issues Under Study (BEI® Committee)

ACGIH® has a procedure that provides the public with an indication of where those chemical substances and physical agents under study fall in the development process. Tier 1 indicates which chemical substances and physical agents may move forward as an NIC or NIE in the upcoming year, based on their status in the development process. Tier 2 consists of those chemical substances and physical agents that will not move forward but will either remain on or be removed from the Under Study list for the next year. For more information, please see the ACGIH® TLV®/BEI® Development Process.

Tier 1 (may move forward with an NIC proposal in 2022)

Chemical Substances

Acrylamide
Antimony (added 7/1/2021)
Arsenic
Atrazine (added 7/1/2021)
Bisphenol A
Dietheylhexyl adipate
Di(2-ethylhexyl)phthalate (DEHP)
Dimethylacetamide
Ethylene glycol

Ethoxyethanol
Ethylene glycol dinitrate
Furfural
Heptane
Iodine
Methylcyclohexane
Nitrobenzene
Phthalates (see DEHP)

Other Issues Under Study

Sq notation

Tier 2 (will not move forward with an NIC proposal in 2022)

Chemical Substances

Adipates
Acrylonitrile
Atrazine
Benzene
Butadiene
Copper
3,3’-Dichlorobenzidine

Nicotine
Platinum
Styrene
Styrene oxide
Xylene (added 7/1/2021)

Other Issues Under Study

Introduction to the BEI® Documentation

Feasibility Assessments

For the substances listed below, the BEI® Committee has determined that developing a BEI® is not currently feasible owing to inadequate scientific data. However, the Committee believes that these substances may pose important risks to the health of workers, and therefore, it encourages the submission of new data. Field or experimental studies on the relationship between biological indicators and either health risk or environmental exposure are needed for these agents. A brief summary of the current negative feasibility assessment, including data needs, for each of the listed substances is available from ACGIH® Science Group.

Substance
Acrylonitrile
Alachlor
Aluminum
Antimony
Beryllium
1-Bromopropane
Chlorpyrifos
1,4-Dichlorobenzene
2,4-Dichlorophenoxyacetic acid
Diethanolamine
2-Ethyl hexanoic acid
Hydrazines
Inorganic borates
Manganese
Methyl tert-butyl ether
Methyl n-butyl ketone
Methylcyclohexane
Methyl n-butyl ketone
Methyl formate
Methyl isobutyl carbinol
α-Methylstyrene
Nickel
Nitrobenzene
Perfluorooctanoic acid
Selenium
Thallium
Trimethylbenzene
Vanadium pentoxide
Vinyl chloride

Date of Feasibility Assessment
March 1994
September 2009
September 2007
November 1996
November 2010
April 2017
October 1996
March 1994
March 1994
September 2013
September 2001
March 1994
October 1995
April 1995
October 1993
December 2020 (added 7/1/2021)
February 2020 (added 7/1/2021)
October 1995
September 2005
December 2020 (added 7/1/2021)
November 2010
November 1996
September 2013
April 2007
October 1995
November 2010
August 1999
September 2009
August 2002