Current AIHA ERPG Values (2009)

Chemical (CAS Number) ERPG–1 ERPG–2 ERPG–3

Acetaldehyde (75-07-0) 10 ppm 200 ppm 1000 ppm 

Acetic Acid (64-19-7) 5 ppm 35 ppm 250 ppm

Acetic Anhydride (108-24-7) 0.5 ppm 15 ppm 100 ppm

Acrolein (107-02-8) 0.05 ppm 0.15 ppm 1.5 ppm 

Acrylic Acid (79-10-7) 2 ppm 50 ppm 750 ppm 

Acrylonitrile (107-13-1) 10 ppm 35 ppm 75 ppm 

Allyl Chloride (107-05-1) 3 ppm 40 ppm 300 ppm

Ammonia (7664-41-7) 25 ppm 150 ppm 750 ppm 

Arsine (7784-42-1)* NA† 0.5 ppm 1.5 ppm 

Benzene (71-43-2) 50 ppm 150 ppm 1000 ppm 

Benzoyl Chloride (98-88-4) 0.3 ppm 5 ppm 20 ppm

Benzyl Chloride (100-44-7) 1 ppm 10 ppm 50 ppm 

Beryllium (7440-41-7) NA† 25 μg/m3 100 μg/m3

Bis (Chloromethyl) Ether 

(542-88-1)* ID‡ 0.1 ppm 0.5 ppm 

Boron Trifluoride (7637-07-2)* 2 mg/m3 30 mg/m3 100 mg/m3

Bromine (7726-95-6) 0.1 ppm 0.5 ppm 5 ppm 

1,3-Butadiene (106-99-0) 10 ppm 200 ppm 5000 ppm 

n-Butyl Acetate (123-86-4) 5 ppm 200 ppm 3000 ppm

n-Butyl Acrylate (141-32-2) 0.05 ppm 25 ppm 250 ppm 

n-Butyl Isocyanate (111-36-4) 0.01 ppm 0.05 ppm 1 ppm 

Carbon Disulfide (75-15-0) 1 ppm 50 ppm 500 ppm 

Carbon Monoxide (630-08-0) 200 ppm 350 ppm 500 ppm 

Carbon Tetrachloride (56-23-5) 20 ppm 100 ppm 750 ppm 

Chlorine (7782-50-5) 1 ppm 3 ppm 20 ppm 

Chlorine Dioxide (10049-04-4) NA† 0.5 ppm 3 ppm

Chlorine Trifluoride (7790-91-2) 0.1 ppm 1 ppm 10 ppm 

1-Chloro-1,1-Difluoroethane 

(HCFC-142b) (75-68-3) 10,000 ppm 15,000 ppm 25,000 ppm 

2-Chloro-1,1,1,2-Tetrafluoroethane 

(2837-89-0) 1,000 ppm 5,000 ppm 10,000 ppm

Chloroacetyl 

Chloride (79-04-9) 0.05 ppm 0.5 ppm 10 ppm 

o-Chlorobenzylidene 

Malononitrile (2698-41-1) 0.005 mg/m3 0.1 mg/m3 25 mg/m3

Chloroform (67-66-3) NA† 50 ppm 5000 ppm 

Chloromethyl Methyl Ether* 

(107-30-2) NA† 1.0 ppm 10 ppm 

Chloropicrin (76-06-2) 0.1 ppm 0.3 ppm 1.5 ppm 

Chlorosulfonic Acid (7790-94-5) 2 mg/m3 10 mg/m3 30 mg/m3

Chlorotrifluoroethylene (79-38-9) 20 ppm 100 ppm 300 ppm 

Cobalt Hydrocarbonyl (16842-03-8) ID‡ 0.13 ppm 0.42 ppm

(Value is given as cobalt.)

Crotonaldehyde (4170-30-3) 0.2 ppm 5 ppm 15 ppm 

24
E

R

P

G

Cyanogen Chloride (506-77-4) NA† 0.4 ppm 4 ppm 

Diborane (19287-45-7) NA† 1 ppm 3 ppm 

1,2-Dichloroethane (107-06-2) 50 ppm 200 ppm 300 ppm

2,4-Dichlorophenol (120-83-2) 0.2 ppm 2 ppm 20 ppm

Dicyclopentadiene (77-73-6) 0.01 ppm 5 ppm 75 ppm

1,1-Difluoroethane (HFC 152a)

(75-37-6) 10,000 ppm 15,000 ppm 25,000 ppm

Diketene (674-82-8) 1 ppm 5 ppm 20 ppm 

Dimethylamine (124-40-3) 0.6 ppm 100 ppm 350 ppm 

Dimethyldichlorosilane (75-78-5) 2 ppm 10 ppm 75 ppm 

Dimethyl Disulfide (624-92-0) 0.01 ppm 50 ppm 250 ppm 

Dimethylformamide (68-12-2) 2 ppm 100 ppm 200 ppm 

Dimethyl Sulfide (75-18-3) 0.5 ppm 1000 ppm 5000 ppm 

Dowtherm J (25340-17-4) 10 ppm 100 ppm 500 ppm

Dowtherm Q (68987-42-8) ID‡ 150 mg/m3 ID‡

Epichlorohydrin (106-89-8) 5 ppm 20 ppm 100 ppm 

Ethyl Acrylate (140-88-5) 0.01 ppm 30 ppm 300 ppm 

Ethyl Chloroformate (541-41-3) ID‡ 5 ppm 10 ppm

2-Ethyl hexanol (104-76-7) 0.1 ppm 100 ppm 200 ppm

Ethylene Oxide (75-21-8) NA† 50 ppm 500 ppm 

Ethylidene Norbornene

(16219-75-3) 0.2 ppm 100 ppm 500 ppm

Fluorine (7782-41-4) 0.5 ppm 5 ppm 20 ppm 

Fluorosulfonic acid (7789-21-1) 2 mg/m3 10 mg/m3 30 mg/m3

Formaldehyde (50-00-0) 1 ppm 10 ppm 25 ppm 

Furfural (98-01-1) 2 ppm 10 ppm 100 ppm 

Gluteraldehyde (111-30-8) 0.2 ppm 1 ppm 5 ppm

HCFC-123 (306-83-2) ID‡ 1000 ppm 10,000 ppm

Hexachlorobutadiene (87-68-3) 1 ppm 3 ppm 10 ppm 

Hexafluoroacetone (684-16-2) NA† 1 ppm 50 ppm 

Hexafluoropropylene* 

(116-15-4) 10 ppm 50 ppm 500 ppm 

1-Hexene (592-41-6) NA† 500 ppm 5,000 ppm

Hydrazine (302-01-2) 0.5 ppm 5 ppm 30 ppm

Hydrogen Chloride (7647-01-0) 3 ppm 20 ppm 150 ppm 

Hydrogen Cyanide (74-90-8) NA† 10 ppm 25 ppm 

Hydrogen Fluoride (7664-39-3)* 2 ppm 20 ppm 50 ppm 

Hydrogen Peroxide (7722-84-1) 10 ppm 50 ppm 100 ppm 

Hydrogen Selenide (7783-07-5) N/A 0.2 ppm 2 ppm

Hydrogen Sulfide (7783-06-4) 0.1 ppm 30 ppm 100 ppm 

Iodine (7553-56-2) 0.1 ppm 0.5 ppm 5 ppm 

Isobutyronitrile (78-82-0) 10 ppm 50 ppm 200 ppm 

2-Isocyanatoethyl 

Methacrylate (30674-80-7) ID‡ 0.1 ppm 1 ppm 

Isoprene (78-79-5) 5 ppm 1000 ppm 4000 ppm

Isopropyl Chloroformate (108-23-6) ID‡ 5 ppm 20 ppm

Chemical (CAS Number) ERPG–1 ERPG–2 ERPG–3

25
Lithium Hydride (7580-67-8) 25 μg/m3 100 μg/m3 500 μg/m3

Maleic Anhydride (108-31-6) 0.2 ppm 2 ppm 20 ppm

Mercury Vapor (7439-97-6) N/A 0.25 ppm 0.5 ppm

Methanol (67-56-1) 200 ppm 1000 ppm 5000 ppm 

Methyl Bromide (74-83-9) NA† 50 ppm 200 ppm 

Methyl Chloride (74-87-3) NA† 400 ppm 1000 ppm 

Methyl Chloroformate (79-22-1) NA† 2 ppm 5 ppm

Methyl Iodide (74-88-4) 25 ppm 50 ppm 125 ppm 

Methyl Isocyanate (624-83-9) 0.025 ppm 0.25 ppm 1.5 ppm 

Methyl Mercaptan (74-93-1) 0.005 ppm 25 ppm 100 ppm 

Methyl tert-Butyl Ether 

(1634-0404) 5 ppm 1000 ppm 5000 ppm

Methylene Chloride (75-09-2) 300 ppm 750 ppm 4000 ppm 

Methylene Diphenyl Diisocyanate 

(MDI) (101-68-8) 0.2 mg/m3 2 mg/m3 25 mg/m3

Methyltrichlorosilane (75-79-6) 0.5 ppm 3 ppm 15 ppm 

Monomethylamine (74-89-5) 10 ppm 100 ppm 500 ppm 

Nitric Acid WFNA (7697-37-2) 1 ppm 6 ppm 78 ppm 

Nitrogen Dioxide (10102-44-0) 1 ppm 15 ppm 30 ppm

Nitrogen Trifluoride (7783-54-2) NA† 400 ppm 800 ppm

1-Octene (111-66-0) 40 ppm 800 ppmb 2000 ppma

Perchloroethylene (127-18-4) 100 ppm 200 ppm 1000 ppm 

Perfluoroisobutylene (382-21-8)* NA† 0.1 ppm 0.3 ppm 

Phenol (108-95-2) 10 ppm 50 ppm 200 ppm 

Phosgene (75-44-5)* NA† 0.5 ppm 1.5 ppm

Phosphine (7803-51-2) NA† 0.5 ppm 5 ppm 

Phosphorus Pentoxide (1314-56-3) 1 mg/m3 10 mg/m3 50 mg/m3

Phosphorus Trichloride 

(7719-12-2) 0.5 ppm 3 ppm 15 ppm

Propylene Glycol Methyl Ether Acetate 

(108-65-6 α-isomer) 

(70657-70-4 β-isomer) 50 ppm 1000 ppm 5000 ppm

Propylene Oxide (75-56-9) 50 ppm 250 ppm 750 ppm 

Sodium Hydroxide* 

(1310-73-2) 0.5 mg/m3 5 mg/m3 50 mg/m3

Stibine (7803-52-3)* ID‡ 0.5 ppm 1.5 ppm 

Styrene (100-42-5) 50 ppm 250 ppm 1000 ppm 

Sulfur Dioxide (7446-09-5) 0.3 ppm 3 ppm 15 ppm 

Sulfuric Acid (Oleum [8014-95-7],

Sulfur Trioxide [7446-11-9], and

Sulfuric Acid [7664-93-9]) 2 mg/m3 10 mg/m3 30 mg/m3

Sulfuryl Chloride (7791-25-5) 0.3 ppm 3 ppm 15 ppm

Tetrachlorosilane (10026-04-7) 0.75 ppm 5 ppm 37 ppm 

Tetraethoxysilane (78-10-4) 25 ppm 100 ppm 300 ppm 

Tetrafluoroethylene (116-14-3) 200 ppm 1000 ppm 10,000 ppm 

Tetrahydrofuran (109-99-9) 100 ppm 500 ppm 5000 ppm

Chemical (CAS Number) ERPG–1 ERPG–2 ERPG–3

26
Tetramethoxysilane (681-84-5) NA† 10 ppm 20 ppm 

Thionyl Chloride (7719-09-7) 0.2 ppm 2 ppm 10 ppm

Titanium Tetrachloride (7550-45-0) 5 mg/m3 20 mg/m3 100 mg/m3

Toluene (108-88-3) 50 ppm 300 ppm 1000 ppm 

Toluene 2,4- (2,6-) Diisocyanate

(TDI) (584-84-9), (91-08-7) 0.01 ppm 0.15 ppm 0.6 ppm

1,1,1-Trichloroethane (71-55-6) 350 ppm 700 ppm 3500 ppm 

Trichloroethylene* (79-01-6) 100 ppm 500 ppm 5000 ppm 

Trichlorosilane (10025-78-2) 1 ppm 3 ppm 25 ppm 

Triethoxysilane (998-30-1) 0.5 ppm 4 ppm 10 ppm

Trimethoxysilane* (2487-90-3) 0.5 ppm 2 ppm 5 ppm 

Trimethylamine (75-50-3) 0.1 ppm 100 ppm 500 ppm 

Trimethylchlorosilane (75-77-4) 3 ppm 20 ppm 150 ppm

Triuranium Octaoxide (1344-59-8) ID‡ 10 mg/m3 50 mg/m3

Uranium Dioxide (1344-57-6) ID‡ 10 mg/m3 30 mg/m3

Uranium Hexafluoride (7783-81-5) 5 mg/m3 15 mg/m3 30 mg/m3

Uranium Trioxide (1344-58-7) ID‡ 0.5 mg/m3 3 mg/m3

Vinyl Acetate (108-05-4) 5 ppm 75 ppm 500 ppm 

Vinyl Chloride (75-01-4) 500 ppm 5000 ppm 20,000 ppm

Vinyl Trichlorosilane (75-94-5) 0.5 ppm 5 ppm 50 ppm

Vinylidene Chloride (75-35-4) ID‡ 500 ppm 1000 ppm

Bold: Part of 2009 Update Set

* 2009 revised document

(ERPG–1: 2 ppm; ERPG–2: 50 ppm; ERPG–3: 170 ppm)

NA† = not appropriate

ID‡ = insufficient data

a This level is 25% of the lower explosive level. b This level is 10% of the lower explosive level.

NOTE: This information is correct as of January 1, 2009. It is possible that

an ERPG under review by the Committee will be balloted and approved in

2009, making it eligible for inclusion in the 2009 ERPG Document Set.

ERPG Values Under Ballot, Review,

and Consideration

These chemicals are under consideration or review by the

AIHA ERP Committee:

Benzene

Boron trifluoride

1,3-Butadiene

n-Butyl acetate

Carbon disulfide

Carbon monoxide

1-Chloro-1,1- (HCFC-142b)

Chloroacetophenone

Chloroacetic acid

Chloroacetyl chloride

Chloroform

Chloromethyl methyl ether

Chloropicrin

Chlorosulfonic acid

E

R

P

G

27

Chemical (CAS Number) ERPG–1 ERPG–2 ERPG–3
28

Cyanogen chloride

Diborane

1,2-Dichloroethane

Diesel/Fuel Oil/Kerosene

Dimethyl disulfide

Dimethyl sulfate

Ethyl acrylate

Ethanol

Fluorine

Formaldehyde

Formic acid

Furfural

Gasoline

Hydrogen chloride

Hydrogen peroxide

Hydroquinone

Iodine

Isocyanuric acid

Methyl bromide

Methyl mercaptan

Methylene diphenyl 

diisocyanate (MDI)

Naphthalene

1-Octanol

Phosphine

Phosphoric acid

Polyethylene glycol

Polypropylene

Propylene glycol

momomethylether acetate

Propylene oxide

Quinoline

Sodium chloroacetate

Sulfur dioxide

Sulfuryl chloride

Sulfuryl fluoride

Tetrachlorosilane

Tetraethoxysilane

Tetramethoxysilane

Thionyl chloride

Toluene

Toluene 2,4-(2,6-)

Diisocyanate (TDI)

1,1,1-Trichloroethane

Trichlorosilane

Trimethyl Chlorosilane