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

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CHEMICAL SUBSTANCES TLVs^®

2025 NOTICE OF INTENDED CHANGES (NIC)
Appendix A
Carbon monoxide (comment period closed)
Copper naphthenate
Malathion
Molybdenum and compounds
Nicotine
Nitric acid (comment period closed)
Propargyl alcohol

2025 ADOPTIONS
Diacetone alcohol
Dimethenamid-P
Enflurane
Heptane, straight and branched isomers
Mesityl oxide
Methyl n-amyl ketone
Metribuzin
Triethylene glycol

2025 UNDER STUDY LIST
Chemical Substances
Aniline
Bifenazate
Bromomethane
Butadiene
p-Chloro-alpha,alpha,alpha-trifluorotoluene (PCBTF)
Cinnamaldehyde
Copper
Cyclohexanol
Dicamba
1,4-Dichloro-2-butene
1,4-Dioxane
Diesel Exhaust
Diethyltoluamide (DEET)
Dimethyl carbamoyl chloride
Ethyl acetate
Ethyl butyl ketone
Fluorides
Lead and inorganic compounds, as Pb
Limonene
2-Mercaptobenzothiazole
4, 4′-Methylene bis(2-chloroaniline)
2-Methylimidazole
4-Methylimidazole
Nitroglycerin
Octachloronaphthalene
Phosphorus
Propylene dichloride (1,2-Dichloropropane)
Sodium silicates

Stoddart solvent
Thorium dioxide
Tolclofos-methyl
o-Toluidine
Trichloronaphthalene
1,2,3-Trichloropropane
Triclopyr

PHYSICAL AGENTS TLVs^®
2025 NOTICE OF INTENDED CHANGES (NIC)
None

2025 ADOPTIONS
None

2025 UNDER STUDY LIST

Electromagnetic Fields

Ergonomics

• Hand Arm Vibration
• Hand Activity Level

Optical Radiation

• Lasers

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

BIOLOGICAL EXPOSURE INDICES (BEIs^®)
2025 NOTICE OF INTENDED CHANGES (NIC)
n-Heptane
Nicotine

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

Feasibility Assessments
Acrylonitrile
Adipates
Alachlor
Aluminum
Antimony
Beryllium
1-Bromopropane
Chlorpyrifos
Copper
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