ACGIH^® Board Ratifies Spring 2026 TLVs^® and BEIs^®

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CHEMICAL SUBSTANCES TLVs^®

2026 NOTICE OF INTENDED CHANGES (NIC)
Aniline
n-Butyl propionate
Carbon monoxide (comment period closed)
Citronellol
Geraniol and related compounds
Propargyl alcohol

2026 ADOPTIONS
1,4-Dichloro-2-butene
Diethyltoluamide (DEET)
Dimethyl carbamoyl chloride
Ethyl butyl ketone
Nitric acid
o-Toluidine

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

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

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

2026 ADOPTIONS
None

2026 UNDER STUDY LIST
Hand Activity Level
Infrasound and Ultrasound
Lasers
Hand Arm Vibration

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

BIOLOGICAL EXPOSURE INDICES (BEIs^®)
2026 NOTICE OF INTENDED CHANGES (NIC)
Methyl ethyl ketone

2026 ADOPTIONS
None

2026 UNDER STUDY LIST
Chemical Substances
1,3-Butadiene
Aluminum
Aniline
Antimony
Benzene
Bisphenol A
Carbon monoxide
Dibutyl phthalate
Glyphosate
Lead
o-Toluidine
Phenol
Trimethylbenzene

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