ACGIH^® Board Ratifies 2025 TLVs^® and BEIs^®

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CHEMICAL SUBSTANCES TLVs^®

2025 NOTICE OF INTENDED CHANGES (NIC)
Carbon monoxide (comment period closed)
p-Chloro-alpha,alpha,alpha-trifluorotoluene
Cyclohexanol
Dicamba
1,4-Dioxane
Ethyl acetate
Germanium tetrahydride
Limonene, all isomers
2-Methylimidazole
4-Methylimidazole
Molybdenum and compounds (comment period closed)
Nitric acid (comment period closed)
Propargyl alcohol (comment period closed)
Thorium dioxide

2025 ADOPTIONS
Appendix A
Copper naphthenate
Malathion
Nicotine

2025 UNDER STUDY LIST
Chemical Substances
o-Anisidine
Aniline
Bifenazate
1-Bromo-3-chloropropane
Bromomethane
Butadiene
Carbon nanotubes
Chloromethyl methyl ether
b-Chloroprene
Cinnamaldehyde
Copper
1,4-Dichloro-2-butene
Diesel Exhaust
Diethyltoluamide (DEET)
Dimethyl carbamoyl chloride
Ethyl butyl ketone
Fluorides
Lead and inorganic compounds, as Pb
Maleic anhydride
2-Mercaptobenzothiazole
4, 4′-Methylene bis(2-chloroaniline)
Methyl tetrahydrophthalic anhydride
o-Nitroanisole
Nitroglycerin

Octachloronaphthalene
Phenylenediamine-meta
Phenylenediamine-ortho
Phenylenediamine-para
Phosphorus
Propylene dichloride (1,2-Dichloropropane)
Sodium silicates
Stoddart solvent
Tolclofos-methyl
o-Toluidine
Trichloronaphthalene
1,2,3-Trichloropropane
Triclopyr
Trimellitic anhydride

PHYSICAL AGENTS TLVs^®
2025 NOTICE OF INTENDED CHANGES (NIC)
Static Magnetic Fields
Whole Body Vibration

2025 ADOPTIONS
None

2025 UNDER STUDY LIST

Ergonomics

• Hand Arm Vibration
• Hand Activity Level

Optical Radiation

• Lasers

Other Issues Under Study
Hyperbaric Pressure
Hypobaric Pressure
Management of Fatigue in the Workplace
Generalized Fatigue and Work Schedules

BIOLOGICAL EXPOSURE INDICES (BEIs^®)
2025 NOTICE OF INTENDED CHANGES (NIC)
None

2025 ADOPTIONS
None

2025 UNDER STUDY LIST
Chemical Substances
1,3-Butadiene
Aluminum
Antimony
Atrazine
Benzene
Bisphenol-A
Carbon monoxide
Dibutyl phthalate
Glyphosate
Lead
Lithium hydroxide
Methyl ethyl ketone
Phenol
Trimethylbenzene
Vinyl chloride

Feasibility Assessments
Acrylonitrile
Adipates
Alachlor
Aluminum
Antimony
Beryllium
1-Bromopropane
Chlorpyrifos
1,4-Dichlorobenzene
3,3’-Dichlorobenzidine
2,4-Dichlorophenoxy acetic acid
Diethanolamine
Diethylhydroxylamine
2-Ethyl hexanoic acid
Ethylene glycol
Formic acid
Hydrazines
Inorganic borates
Manganese
Methyl tert-butyl ether
Methyl n-butyl ketone
Methylcyclohexane
Methyl formate
Methyl isobutyl carbinol
α-Methylstyrene
Nitrobenzene
Perfluorooctanoic acid
Selenium
Styrene oxide
Thallium
Trimethylbenzene
Vanadium pentoxide
Vinyl chloride