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

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CHEMICAL SUBSTANCES TLVs^®

2026 NOTICE OF INTENDED CHANGES (NIC)
Aniline
Carbon monoxide (comment period closed)
Dicamba (comment period closed)
1,4-Dichloro-2-butene
Diethyltoluamide (DEET)
Dimethyl carbamoyl chloride
Ethyl butyl ketone
Nitric acid (comment period closed)
Propargyl alcohol (comment period closed)
o-Toluidine

2026 ADOPTIONS
Appendix A
p-Chloro-alpha,alpha,alpha-trifluorotoluene
Cyclohexanol
1,4-Dioxane
Ethyl acetate
Germanium tetrahydride
Limonene, all isomers
2-Methylimidazole
4-Methylimidazole
Molybdenum, soluble compounds
Thorium dioxide

2026 UNDER STUDY LIST
Chemical Substances
o-Anisidine
Bifenazate
1-Bromo-3-chloropropane
Bromomethane
Butadiene
n-Butyl Propionate
Carbon nanotubes
b-Chloroprene
Citronellol
Copper
1,2-Dichloroethylene
Diesel Exhaust
Fluorides
Fufural
Furfuryl alcohol
Geraniol
Lead and inorganic compounds, as Pb
Maleic anhydride
2-Mercaptobenzothiazole
4, 4′-Methylene bis(2-chloroaniline)
Monochloramine
o-Nitroanisole

Nitroglycerin
Phenylenediamine-meta
Phenylenediamine-ortho
Phenylenediamine-para
Phosphorus
Platinum
p-Toluidine
Sodium hydroxide
Sodium silicates
Stoddart solvent
Subtilisins
Tolclofos-methyl
m-Toluidine
1,2,3-Trichloropropane
Triclopyr
Trimellitic anhydride

PHYSICAL AGENTS TLVs^®
2026 NOTICE OF INTENDED CHANGES (NIC)
None

2026 ADOPTIONS
Static Magnetic Fields
Whole Body Vibration

2026 UNDER STUDY LIST
Physical Agents
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^®)
2026 NOTICE OF INTENDED CHANGES (NIC)
None

2026 ADOPTIONS
n-Heptane
Nicotine

2026 UNDER STUDY LIST
Chemical Substances
1-Bromopropane
1,3-Butadiene
Aluminum
Antimony
Atrazine
Benzene
Bisphenol-A
Carbon monoxide
Dibutyl phthalate
Glyphosate
Lead
Lithium hydroxide
Manganese
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