Exposure limits are reported in ppm, mg/m3, or f/cc. In general, substances present in air as a vapour or gas are reported in parts per million (ppm). Substances present in air as an aerosol (dust, fume, mist) and mixtures such as diesel fuel are typically reported in milligrams per cubic meter (mg/m3). Fibrous substances, such as synthetic vitreous fibers (e.g., glass wool fibers) are reported in fibers per cubic centimeter (f/cc).

Notations column
The notations identify substances considered to be carcinogens, sensitizers and those with adverse reproductive effect. The notations column also indicates substances that contribute significantly to overall exposure by the skin route.

TWA column
This is the 8-hour time weighted average (TWA) limit, as defined in OHS Regulations.

STEL/Ceiling column
This is the short-term exposure limit or STEL, which is defined in the OHS Regulations.

Any missing compounds may be available – CDC NIOSH Pocket Guide.

Exposure Limits Chart

Substance [CAS No.]TWASTEL/CeilingNotations
Abate (See Temephos)
Acetaldehyde [75-07-0] Revised 2014C 25 ppmA2, 2B
Acetamide [60-35-5]2B
Acetic acid [64-19-7]10 ppm15 ppm
Acetic anhydride [108-24-7] Revised 20111 ppm3 ppm
Acetone [67-64-1]250 ppm500 ppm
Acetone cyanohydrin [75-86-5]C 1 ppmSkin
Acetonitrile [75-05-8]20 ppmSkin
Acetophenone [98-86-2]10 ppm
Acetylene [74-86-2]Simple asphyxiant
Acetylene tetrabromide (See 1,1,2,2 Tetrabromoethane)
Acetylsalicylic acid (Aspirin) [50-78-2]5 mg/m3
Acrolein [107-02-8]C 0.1 ppmSkin
Acrylamide, Inhalable [79-06-1] Revised 20050.03 mg/m3 (V)Skin; 2A
Acrylic acid [79-10-7]2 ppmSkin; R
Acrylonitrile [107-13-1]2 ppmSkin; 2B
Adipic acid [124-04-9]5 mg/m3
Adiponitrile [111-69-3]2 ppmSkin
Alachlor, Inhalable [15972-60-8] Revised 20071.0 mg/m3(V)S
Aldrin, Inhalable [309-00-2] Revised 20070.05mg/m3(V)Skin
Aliphatic hydrocarbon gases [C1-C4] Revised 20041000 ppm
Allyl alcohol [107-18-6]0.5 ppmSkin
Allyl amine [107-11-9]2 ppm
Allyl bromide [106-95-6](I)
Allyl chloride [107-05-1] Revised 20111 ppm2 ppmSkin
Allyl glycidyl ether [106-92-3]1 ppmS
Allyl propyl disulfide [2179-59-1] Revised 20060.5 ppmS
Aluminum metal and insoluble compounds [7429-90-5] , Respirable, Revised 20081.0 mg/m3
4-Aminodiphenyl [92-67-1](L)Skin; A1, 1
2-Aminopyridine [504-29-0]0.5 ppm
Amitrole [61-82-5] Revised 20060.2 mg/m3R
Ammonia [7664-41-7]25 ppm35 ppm
Ammonium chloride – Fume [12125-02-9]10 mg/m320 mg/m3
Ammonium perfluorooctanoate [3825-26-1]0.01 mg/m3Skin
Ammonium sulfamate [7773-06-0]10 mg/m3(N)
tert-Amyl methyl ether (TAME) [994-05-8]20 ppmR
Aniline [62-53-3]2 ppmSkin
o-Anisidine [90-04-0]0.5 mg/m3Skin; 2B
p-Anisidine [104-94-9]0.5 mg/m3Skin
Antimony and compounds, as Sb [7440-36-0]0.5 mg/m3
Antimony hydride (Stibine) [7803-52-3]0.1 ppm
Antimony trioxide – Production [1309-64-4](L)A2, 2B
ANTU [86-88-4]0.3 mg/m3
Argon [7440-37-1]Simple asphyxiant
Arsenic and inorganic compounds, as As [7440-38-2]0.01 mg/m3A1, 1
Arsine [7784-42-1] Revised 20070.005 ppm
Asbestos – All forms [1332-21-4]0.1 f/cc (F)A1, 1
Asphalt (Bitumen) fume, as benzene-soluble aerosol, Inhalable [8052-42-4]0.5 mg/m3(I)
Atrazine [1912-24-9]5 mg/m3
Azinphos-methyl, Inhalable [86-50-0]0.2 mg/m3(V)Skin; S
Barium and soluble compounds, as Ba [7440-39-3]0.5 mg/m3
Barium sulfate [7727-43-7]10 mg/m3(N)
Benomyl, Inhalable [17804-35-2] Revised 20081 mg/m3R, S
Benz[a]anthracene [56-55-3] Revised 2006(L)A2, 2B
Benzene [71-43-2]0.5 ppm2.5 ppmSkin; A1, 1
Benzidine [92-87-5](L)Skin; A1, 1
Benzidine based dyes2A
Benzo[b]fluoranthene [205-99-2](L)A2, 2B
Benzo[a]pyrene [50-32-8] Revised 2006(L)A2, 1
Benzotrichloride [98-07-7]C 0.1 ppmSkin; A2, 2A
Benzoyl chloride [98-88-4]C 0.5 ppm2A
Benzoyl peroxide [94-36-0]5 mg/m3
Benzyl acetate [140-11-4]10 ppm
Benzyl chloride [100-44-7]C 1 ppm2A
Beryllium and compounds, Inhalable, as Be [7440-41-7] Revised 2009; 2010; 20150.00005 mg/m3Skin; S; A1, 1; (I)
Biphenyl [92-52-4]0.2 ppm
Bis(2-dimethylaminoethyl) ether (DMAEE) [3033-62-3]0.05 ppm0.15 ppmSkin
Bismuth telluride – Se-doped [1304-82-1]5 mg/m3
Bismuth telluride – Undoped [1304-82-1]10 mg/m3(N)
Borate compounds, Inorganic, Inhalable [1303-96-4; 1330-43-4; 10043-35-3; 12179-04-3] Revised 20052 mg/m36 mg/m3
Boron oxide [1303-86-2]10 mg/m3
Boron tribromide [10294-33-4]C 1 ppm
Boron trifluoride [7637-07-02]C 1 ppm
Bromacil [314-40-9]10 mg/m3
Bromine [7726-95-6]0.1 ppm0.2 ppm
Bromine pentafluoride [7789-30-2]0.1 ppm
Bromochloromethane [74-97-5]200 ppm250 ppm
Bromoform [75-25-2] Revised 20090.5 ppm
1-Bromopropane [106-94-5] Revised 200510 ppmR
1,3-Butadiene [106-99-0]2 ppmA2, 1
n-Butane [106-97-8]600 ppm750 ppm
n-Butanol [71-36-3]15 ppmC 30 ppm
sec-Butanol [78-92-2]100 ppm
tert-Butanol [75-65-0]100 ppm
Butenes, all isomers, including Isobutene [106-98-9; 107-01-7; 590-18-1; 624-64-6; 25167-67-3; 115-11-7](I)
2-Butoxyethanol (EGBE) [111-76-2] Revised 200320 ppm
2-Butoxyethyl acetate [112-07-2] Revised 200320 ppm
n-Butyl acetate [123-86-4]20 ppm
sec-Butyl acetate [105-46-4]200 ppm
tert-Butyl acetate [540-88-5]200 ppm
n-Butyl acrylate [141-32-2]2 ppmS
n-Butylamine [109-73-9]C 5 ppmSkin
Butylated hydroxytoluene (BHT), Inhalable, (2,6-Di-tert-butyl-p-cresol) [128-37-0]2 mg/m3(V)
tert-Butyl chromate, as CrO3 [1189-85-1]C 0.1 mg/m3Skin
n-Butyl glycidyl ether (BGE) [2426-08-6] Revised 20053 ppmSkin; S; R
n-Butyl lactate [138-22-7]5 ppm
n-Butyl mercaptan [109-79-5]0.5 ppmR
n-Butyl methacrylate [97-88-1]50 ppm
o-sec-Butylphenol [89-72-5]5 ppmSkin
p-tert-Butyltoluene [98-51-1]1 ppm
Cadmium and compounds, as Cd [7440-43-9]0.01 mg/m3A2, 1
Cadmium and compounds, Respirable, as Cd [7440-43-9]0.002 mg/m3A2, 1
Calcium arsenate, as As [7778-44-1]0.01 mg/m3A1, 1
Calcium carbonate (incl. Limestone, Marble) [1317-65-3]10 mg/m3(N)20 mg/m3
Calcium chromate, as Cr [13765-19-0]0.001 mg/m3A2, 1
Calcium cyanamide [156-62-7]0.5 mg/m3
Calcium hydroxide [1305-62-0]5 mg/m3
Calcium oxide [1305-78-8]2 mg/m3
Calcium silicate – Synthetic nonfibrous [1344-95-2]10 mg/m3(E,N)
Calcium sulfate, Inhalable [7778-18-9]10 mg/m3
Camphor – Synthetic [76-22-2]2 ppm3 ppm
Caprolactam, Dust [105-60-2]1 mg/m33 mg/m3
Captafol [2425-06-1]0.1 mg/m3Skin; 2A; S
Captan, Inhalable [133-06-2]5 mg/m3S
Carbaryl [63-25-2] Revised 2008; 20105 mg/m3Skin; R
Carbofuran, Inhalable [1563-66-2] Revised 20040.1 mg/m3(V)
Carbon black, Inhalable [1333-86-4] Revised 20113 mg/m32B
Carbon dioxide [124-38-9]5000 ppm15,000 ppm
Carbon disulfide [75-15-0]4 ppm12 ppmSkin
Carbon monoxide [630-08-0]25 ppm100 ppmR
Carbon tetrabromide [558-13-4]0.1 ppm0.3 ppm
Carbon tetrachloride [56-23-5]2 ppmSkin; A2, 2B
Carbonyl fluoride [353-50-4]2 ppm5 ppm
Carbonyl sulfide [463-58-1] Revised 20155 ppm
Catechol [120-80-9]5 ppmSkin; 2B
Cellulose [9004-34-6]10 mg/m3(N)
Cesium hydroxide [21351-79-1]2 mg/m3
Chlordane [57-74-9]0.5 mg/m3Skin; 2B
Chlorinated camphene [8001-35-2]0.5 mg/m31 mg/m3Skin; 2B
o-Chlorinated diphenyl oxide [31242-93-0]0.5 mg/m3
Chlorine [7782-50-5]0.5 ppm1 ppm
Chlorine dioxide [10049-04-4]0.1ppm0.3 ppm
Chlorine trifluoride [7790-91-2]C 0.1 ppm
Chloroacetaldehyde [107-20-0]C 1 ppm
Chloroacetic acid [79-11-8]0.3 ppm
Chloroacetone [78-95-5]C 1 ppmSkin
2-Chloroacetophenone [532-27-4]0.05 ppmS
Chloroacetyl chloride [79-04-9]0.05 ppm0.15 ppmSkin
p-Chloroaniline [106-47-8]2B
Chlorobenzene [108-90-7]10 ppm
o-Chlorobenzylidene malononitrile [2698-41-1]C 0.05 ppmSkin
Chlorobromomethane (see Bromochloromethane)
1-Chloro-1,1-difluoroethane [75-68-3]1000 ppm
Chlorodifluoromethane [75-45-6]500 ppm1250 ppm
Chlorodiphenyl (42% chloride) [53469-21-9]1 mg/m3Skin; 2A
Chlorodiphenyl (54% chloride) [11097-69-1]0.5 mg/m3Skin; 2A
Chloroform [67-66-3]2 ppm2B; R
bis(Chloromethyl) ether [542-88-1]0.001 ppmA1, 1
Chloromethyl methyl ether [107-30-2](L)A2, 1
1-Chloro-1-nitropropane [600-25-9]2 ppm
Chloropentafluoroethane [76-15-3]1000 ppm
Chloropicrin [76-06-2]0.1 ppm
1-Chloro-2-propanol [127-00-4] Revised 20081 ppmSkin; R
2-Chloro-1-propanol [78-89-7] Revised 20081 ppmSkin; R
beta-Chloroprene [126-99-8]10 ppmSkin; 2B; R
2-Chloropropioni acid [598-78-7]0.1 ppmSkin; R
o-Chlorostyrene [2039-87-4]50 ppm75 ppm
o-Chlorotoluene [95-49-8]50 ppm
4-Chloro-o-Toluidine [95-69-2]2A
Chlorotrifluoromethane [75-72-9]1000 ppm
Chlorpyrifos, Inhalable [2921-88-2] Revised 20030.1 mg/m3(V)Skin
Chromite ore processing (Chromate), as Cr0.05 mg/m3A1
Chromium – Metal [7440-47-3]0.5 mg/m3
Chromium (III) inorganic compounds, as Cr [7440-47-3]0.5 mg/m3
Chromium (VI) inorganic compounds – Insoluble, as Cr [7440-47-3]0.01 mg/m3A1, 1
Chromium (VI) inorganic compounds – Water soluble, as Cr [7440-47-3]0.025 mg/m3C 0.1 mg/m3A1, 1
Chromyl chloride [14977-61-8]0.025 ppm
Chrysene [218-01-9] Revised 2006(L)2B
Citral, inhalable [5292-40-5](I)
Clopidol [2971-90-6]10 mg/m3(N)
Coal dust – Anthracite, Respirable0.4 mg/m3
Coal dust – Bituminous, Respirable0.9 mg/m3
Coal tar pitch volatiles, as benzene-soluble aerosol [65996-93-2]0.2 mg/m3A1, 1
Cobalt and inorganic compounds, as Co [7440-48-4]0.02 mg/m32B
Cobalt carbonyl, as Co [10210-68-1]0.1 mg/m32B
Cobalt hydrocarbonyl, as Co [16842-03-8]0.1 mg/m32B
Copper – Dusts and mists, as Cu [7440-50-8]1 mg/m3
Copper – Fume, as Cu [7440-50-8]0.2 mg/m3
Cotton dust – Raw, Untreated, Thoracic, Revised 20110.1 mg/m3
Coumaphos, Inhalable [56-72-4] Revised 20060.05 mg/m3 (V)Skin
Cresol, all isomers [1319-77-3; 95-48-7; 108-39-4; 106-44-5]10 mg/m3Skin
Crotonaldehyde [4170-30-3]C 0.3 ppmSkin
Crufomate [299-86-5]5 mg/m3
Cumene [98-82-8]25 ppm75 ppm2B
Cyanamide [420-04-2]2 mg/m3
Cyanogen [460-19-5]10 ppm
Cyanogen bromide [506-68-3](I)
Cyanogen chloride [506-77-4]C 0.3 ppm
Cyclohexane [110-82-7]100 ppm
Cyclohexanol [108-93-0]50 ppmSkin
Cyclohexanone [108-94-1] Revised 200320 ppm50 ppmSkin
Cyclohexene [110-83-8]300 ppm
Cyclohexylamine [108-91-8]10 ppm
Cyclonite [121-82-4]0.5 mg/m3Skin
Cyclopentadiene [542-92-7]75 ppm
Cyclopentane [287-92-3]600 ppm
Cyhexatin [13121-70-5]5 mg/m3
2,4-D (2,4-Dichlorophenoxy-acetic acid) [94-75-7] (see 2,4-Dichlorophenoxyacetic acid and its esters)
DDT (Dichloro-diphenyltrichloroethane) [50-29-3]1 mg/m32B
Decaborane [17702-41-9]0.05 ppm0.15 ppmSkin
Demeton, Inhalable [8065-48-3]0.05 mg/m3 (V)Skin
Demeton-S-methyl, Inhalable [919-86-8]0.05 mg/m3 (V)Skin; S
Diacetone alcohol [123-42-2]50 ppm
Diacetyl [431-03-8] Revised 20150.01 ppm0.02 ppm
2,4-Diaminoanisole [615-05-4]2B
2,4-Diaminotoluene [95-80-7]2B
Diazinon, Inhalable [333-41-5] Revised 20030.01 mg/m3 (V)Skin
Diazomethane [334-88-3]0.2 ppmA2
Diborane [19287-45-7]0.1 ppm
1,2-Dibromo-3-chloropropane [96-12-8]2B
2-N-Dibutylaminoethanol [102-81-8]0.5 ppmSkin
Dibutyl phenyl phosphate [2528-36-1]0.3 ppmSkin
Dibutyl phosphate [107-66-4] Revised 2009; 20101 ppm2 ppmSkin
Dibutyl phthalate [84-74-2]5 mg/m3R
Dichloroacetic acid [79-43-6] Revised 20050.5 ppmSkin; 2B; R
Dichloroacetylene [7572-29-4]C 0.1 ppm
o-Dichlorobenzene [95-50-1]25 ppm50 ppm
p-Dichlorobenzene [106-46-7]10 ppm2B
3,3′-Dichlorobenzidine [91-94-1](L)Skin; 2B
1,4-Dichloro-2-butene [764-41-0]0.005 ppmSkin; A2
2,2-Dichlorodiethyl sulfide (Mustard Gas) [505-60-2]1
Dichlorodifluoromethane [75-71-8]1000 ppm
1,3-Dichloro-5,5-dimethyl hydantoin [118-52-5]0.2 mg/m30.4 mg/m3
1,1-Dichloroethane [75-34-3]100 ppm
1,2-Dichloroethane (see ethylene dichloride)
1,2-Dichloroethylene, all isomers [540-59-0; 156-59-2; 156-60-5]200 ppm
Dichloroethyl ether [111-44-4]5 ppm10 ppmSkin
Dichlorofluoromethane [75-43-4]10 ppm
Dichloromethane [75-09-2]25 ppm2B
2,2′-Dichloro-n-methyldiethylamine (Nitrogen mustard) [51-75-2]2A
1,1-Dichloro-1-nitroethane [594-72-9]2 ppm
1,3-Dichloropropene [542-75-6]1 ppmSkin; 2B
2,4-Dichlorophenoxyacetic acid and its esters [94-75-7] Revised 200610 mg/m320 mg/m3(I)
2,2-Dichloropropionic acid, Inhalable [75-99-0]5 mg/m3
Dichlorotetrafluoroethane (Cryofluorane) [76-14-2]1000 ppm
Dichlorvos (DDVP), Inhalable [62-73-7]0.1 mg/m3(V)Skin; 2B; S
Dicrotophos, Inhalable [141-66-2]0.05 mg/m3 (V)Skin
Dicyclohexylmethane-4,4′-diisocyanate [5124-30-1] (see Methylene bis (4-cyclohexyl-isocyanate))
Dicyclopentadiene [77-73-6]5 ppm
Dicyclopentadienyl iron [102-54-5]10 mg/m3(N)
Dieldrin [60-57-1]0.25 mg/m3Skin
Diesel fuel, as total hydrocarbons, Inhalable [68334-30-5; 68476-30-2; 68476-31-3; 68476-34-6; 77650-28-3]100 mg/m3(V)Skin; (I)
Diethanolamine [111-42-2] Revised 2009; 20102 mg/m3Skin; 2B
Diethylamine [109-89-7]5 ppm15 ppmSkin
2-Diethylaminoethanol [100-37-8]2 ppmSkin
Diethylene triamine [111-40-0]1 ppmSkin; S
Di(2-ethylhexyl)phthalate (DEHP) [117-81-7]5 mg/m32B
Diethyl ketone [96-22-0]200 ppm300 ppm
Diethyl phthalate [84-66-2]5 mg/m3
Diethyl sulfate [64-67-5]2A
Diethylene glycol monobutyl ether [112-34-5](I)
N,N-Diethylhydroxylamine [3710-84-7](I)
Difluorodibromomethane [75-61-6]100 ppm
Diglycidyl ether (DGE) [2238-07-5] Revised 20070.01 ppmR
Diisobutyl ketone [108-83-8]25 ppm
Diisocyanates, not elsewhere specified, NOS0.005 ppmC 0.01ppm
Diisopropylamine [108-18-9]5 ppmSkin
3,3′-Dimethoxybenzidine [119-90-4]2B
Dimethoxymethane [109-87-5]1000 ppm1250 ppm
N,N-Dimethylacetamide [127-19-5]10 ppmSkin; R
Dimethylamine [124-40-3]5 ppm15 ppm
Dimethylaniline [121-69-7]5 ppm10 ppmSkin
3,3′-Dimethylbenzidine [119-93-7]2B
Dimethyl carbamoyl chloride [79-44-7] Revised 20070.005 ppmSkin; A2, 2A
Dimethyl disulfide [624-92-0] Revised 20070.5 ppmSkin
Dimethyl ether [115-10-6]1000 ppm
Dimethylethoxysilane [14857-34-2]0.5 ppm1.5 ppm
Dimethylformamide [68-12-2]10 ppmSkin
1,1-Dimethylhydrazine [57-14-7]0.01 ppmSkin; 2B
1,2-Dimethylhydrazine [540-73-8]2A
Dimethyl phthalate [131-11-3]5 mg/m3
Dimethyl sulfate [77-78-1]C 0.1 ppmSkin; 2A
Dimethyl sulfide [75-18-3] Revised 200410 ppm
Dinitolmide [148-01-6] (See 3,5-Dinitro-o-toluamide)
Dinitrobenzene, all isomers [528-29-0; 99-65-0; 100-25-4; 25154-54-5]0.15 ppmSkin
Dinitrol-o-cresol [534-52-1]0.2 mg/m3Skin
3,5-Dinitro-o-toluamide [148-01-6] Revised 20071 mg/m3
Dinitrotoluene [25321-14-6]0.2 mg/m3Skin; 2B; (I); R
n-Dioctyl phthalate [117-84-0]5 mg/m3
1,4-Dioxane [123-91-1]20 ppmSkin; 2B
Dioxathion, Inhalable [78-34-2]0.1 mg/m3(V)Skin
1,3-Dioxolane [646-06-0]20 ppmR
Diphenylamine [122-39-4]10 mg/m3
Dipropyl ketone [123-19-3]50 ppm
Dipropylene glycol methyl ether [34590-94-8]100 ppm150 ppmSkin
Diquat, Inhalable [2764-72-9]0.5 mg/m3Skin
Diquat, Respirable [2764-72-9]0.1 mg/m3Skin
Disulfiram [97-77-8]2 mg/m3
Disulfoton, Inhalable [298-04-4]0.05 mg/m3 (V)Skin
Diuron [330-54-1]10 mg/m3
Divinyl benzene [1321-74-0]10 ppm
Dodecyl mercaptan [112-55-0] Revised 20040.1 ppmS
Dyfonate, Inhalable [944-22-9] Revised 20060.1 mg/m3(V)Skin
Endosulfan [115-29-7] Revised 2009; 20100.1 mg/m3Skin
Endrin [72-20-8]0.1 mg/m3Skin
Enflurane [13838-16-9]2 ppm
Epichlorohydrin [106-89-8]0.1 ppmSkin; 2A; R
EPN, Inhalable [2104-64-5] Revised 20030.1 mg/m3Skin
Ethane [74-84-0] Revised 2004 See Aliphatic Hydrocarbon gases [C1-C4] Revised 2008
Ethanol [64-17-5] Revised 20091000 ppm
Ethanolamine [141-43-5]3 ppm6 ppm
Ethion, Inhalable [563-12-2] Revised 20030.05 mg/m3Skin
2-Ethoxyethanol (EGEE) [110-80-5]5 ppmSkin; R
2-Ethoxyethyl acetate (EGEEA) [111-15-9]5 ppmSkin; R
Ethyl acetate [141-78-6]150 ppm
Ethyl acrylate [140-88-5]5 ppm15 ppm2B; S
Ethylamine [75-04-7]5 ppm15 ppmSkin
Ethyl amyl ketone [541-85-5] Revised 200710 ppm
Ethyl benzene [100-41-4] Revised 201120 ppm2B
Ethyl bromide [74-96-4]5 ppmSkin
Ethyl tert-butyl ether (ETBE) [637-92-3]5 ppmR
Ethyl butyl ketone [106-35-4]50 ppm75 ppm
Ethyl chloride [75-00-3]100 ppmSkin
Ethyl cyanoacrylate [7085-85-0]0.2 ppm
Ethyl methacrylate [97-63-2]50 ppm
Ethylene [74-85-1] Revised 2005200 ppm
Ethylene chlorohydrin [107-07-3]C 1 ppmSkin
Ethylenediamine [107-15-3]10 ppmSkin; S
Ethylene dibromide [106-93-4]0.5 ppmSkin; 2A
Ethylene dichloride (1,2-dichloroethane) [107-06-2]1 ppm2 ppm2B
Ethylene glycol – Aerosol [107-21-1]C 100 mg/m3
Ethylene glycol – Particulate [107-21-1]10 mg/m320 mg/m3
Ethylene glycol – Vapour [107-21-1]C 50 ppm
Ethylene glycol dinitrate (EGDN) [628-96-6]0.05 ppmSkin
Ethylene oxide [75-21-8]0.1 ppm1 ppmA2, 1; R
Ethyleneimine [151-56-4] Revised 2009; 20100.5 ppmSkin; 2B
Ethyl ether [60-29-7]400 ppm500 ppm
Ethyl formate [109-94-4] Revised 2015100 ppm
2-Ethylhexanoic acid, Inhalable [149-57-5]5 mg/m3(V)R
Ethylidene norbornene [16219-75-3]C 5 ppm
Ethyl isocyanate [109-90-0](I)
Ethyl mercaptan [75-08-1]0.5 ppm
N-Ethylmorpholine [100-74-3]5 ppmSkin
Ethyl silicate [78-10-4]10 ppm
Fenamiphos, Inhalable [22224-92-6] Revised 20060.05 mg/m3 (V)Skin
Fensulfothion, Inhalable [115-90-2] Revised 20050.01 mg/m3 (V)Skin
Fenthion, Inhalable [55-38-9] Revised 20060.05 mg/m3 (V)Skin
Ferbam, Inhalable [14484-64-1] Revised 20095 mg/m3
Ferrovanadium dust [12604-58-9]1 mg/m33 mg/m3
Flour dust, Inhalable0.5 mg/m3S
Fluorides (as F)2.5 mg/m3
Fluorine [7782-41-4]0.1 ppm
Fluroxene [406-90-6]2 ppm
Fonofos (see Dyfonate) [944-22-9]
Formaldehyde [50-00-0]0.3 ppmC 1 ppmA2, 1; S
Formamide [75-12-7]10 ppmSkin
Formic acid [64-18-6]5 ppm10 ppm
Furfural [98-01-1]2 ppmSkin
Furfuryl alcohol [98-00-0]5 ppm10 ppmSkin
Gallium arsenide, Respirable [1303-00-0] Revised 20050.0003 mg/m31
Gasoline [86290-81-5]300 ppm500 ppm2B
Germanium tetrahydride [7782-65-2]0.2 ppm
Glutaraldehyde, Activated & inactivated [111-30-8]C 0.05 ppmS
Glycerin – mist [56-81-5]10 mg/m3
Glycerin – mist, Respirable [56-81-5]3 mg/m3
Glycidol [556-52-5]2 ppm2A
Glyoxal, Inhalable [107-22-2]0.1 mg/m3(V)S
Grain dust (oat, wheat, barley)4 mg/m3(E)
Graphite – All forms except graphite fibres, Respirable [7782-42-5]2 mg/m3
Gypsum [13397-24-5]10 mg/m3(N)20 mg/m3
Hafnium and compounds, as Hf [7440-58-6]0.5 mg/m3
Halothane [151-67-7]2 ppmR
Helium [7440-59-7]Simple asphyxiant
Heptachlor [76-44-8]0.05 mg/m3Skin; 2B
Heptachlor epoxide [1024-57-3]0.05 mg/m3Skin
Heptane (n-Heptane) [142-82-5]400 ppm500 ppm
Hexachlorobenzene (HCB) [118-74-1]0.002 mg/m3Skin; 2B
Hexachlorobutadiene [87-68-3]0.02 ppmSkin
Hexachlorocyclopentadiene [77-47-4]0.01 ppm
Hexachloroethane [67-72-1]1 ppmSkin; 2B
Hexachloronaphthalene [1335-87-1]0.2 mg/m3Skin
Hexafluoroacetone [684-16-2]0.1 ppmSkin; R
Hexafluoropropylene [116-15-4] Revised 20070.1 ppm
Hexahydrophthalic anhydride, all isomers, Inhalable [85-42-7; 13149-00-3; 14166-21-3] Revised 2004C 0.005 mg/m3 (V)S
Hexamethyl phosphoramide [680-31-9]Skin; 2B
Hexamethylene diisocyanate (HDI) [822-06-0]0.005 ppmC 0.01 ppmS
n-Hexane [110-54-3]20 ppmSkin
Hexane, all isomers except n-Hexane200 ppm
1,6-Hexanediamine [124-09-4]0.5 ppm
1-Hexene [592-41-6]50 ppmR
sec-Hexyl acetate [108-84-9]50 ppm
Hexylene glycol [107-41-5]C 25 ppm
Hydrazine [302-01-2]0.01 ppmSkin; 2B
Hydrogen [1333-74-0]Simple asphyxiant
Hydrogenated terphenyls – Nonirradiated [61788-32-7]0.5 ppm
Hydrogen bromide [10035-10-6] Revised 2004C 2 ppm
Hydrogen chloride [7647-01-0] Revised 2006C 2 ppm
Hydrogen cyanide, as CN [74-90-8]C 4.7 ppmSkin
Cyanide salts, as CN [592-01-8; 151-50-8; 143-33-9]C 5 mg/m3Skin
Hydrogen fluoride, as F [7664-39-3]C 2 ppm
Hydrogen peroxide [7722-84-1]1 ppm
Hydrogen selenide [7783-07-5]0.05 ppm
Hydrogen sulfide [7783-06-4]C 10 ppm
Hydroquinone [123-31-9] Revised 20081 mg/m3S
2-Hydroxypropyl acrylate [999-61-1]0.5 ppmSkin; S
Indene [95-13-6] Revised 2008; 201010 ppm
Indium and compounds, as In [7440-74-6]0.1 mg/m32B; (I)
Iodides(I)
Iodine [7553-56-2] Revised 2008; 2010C 0.1 ppm
Iodoform [75-47-8]0.6 ppm
Iron oxide dust, as Fe [1309-37-1]5 mg/m3
Iron oxide fume , as Fe [1309-37-1]5 mg/m310 mg/m3
Iron pentacarbonyl [13463-40-6]0.01 ppm
Iron salts – soluble, as Fe1 mg/m32 mg/m3
Isoamyl alcohol [123-51-3]100 ppm125 ppm
Isobutanol [78-83-1]50 ppm
Isobutyl acetate [110-19-0]150 ppm
Isobutyl nitrite, Inhalable [542-56-3]C 1 ppm (V)
Isooctyl alcohol [26952-21-6]50 ppmSkin
Isophorone [78-59-1]C 5 ppm
Isophorone diisocyanate [4098-71-9]0.005 ppmC 0.01 ppmS
Isopropanol (Isopropyl alcohol) [67-63-0] Revised 2003200 ppm400 ppm
2-Isopropoxyethanol [109-59-1]25 ppmSkin
Isopropyl acetate [108-21-4] Revised 2003100 ppm200 ppm
Isopropylamine [75-31-0]5 ppm10 ppm
N-Isopropylaniline [768-52-5]2 ppmSkin
Isopropyl ether [108-20-3]250 ppm310 ppm
Isopropyl glycidyl ether (IGE) [4016-14-2]C 50 ppm
Kaolin, Respirable [1332-58-7]2 mg/m3(E)
Kerosene [8008-20-6]/Jet fuels [64742-47-8], as total hydrocarbon vapour, Revised 2006200 mg/m3(P)Skin
Ketene [463-51-4]0.5 ppm1.5 ppm
Lead – elemental and inorganic compounds, as Pb [7439-92-1]0.05 mg/m3Elemental 2B; R
Other inorganic 2A; R
Lead chromate, as Cr [7758-97-6]0.012 mg/m3A2, 1; R; (I)
Lead chromate, as Pb [7758-97-6]0.05 mg/m3A2, 1; R; (I)
Lindane [58-89-9]0.5 mg/m3Skin
Liquified petroleum gas (L.P.G.) [68476-85-7]1000 ppm1250 ppm
Lithium hydroxide [1310-65-2]C 1 mg/m3
Lithium hydride [7580-67-8]0.025 mg/m3
Magnesite [546-93-0] Revised 2006 (See Particles Not Otherwise Classified (PNOC))
Magnesium oxide (fume), Inhalable [1309-48-4] Revised 200310 mg/m3
Magnesium oxide, Respirable dust and fume, as Mg [1309-48-4]3 mg/m310 mg/m3
Malathion, Inhalable [121-75-5] Revised 20031 mg/m3(V)Skin
Maleic anhydride [108-31-6]0.1 ppmS
Manganese – Elemental & inorganic compounds, as Mn [7439-96-5]0.2 mg/m3R
Manganese cyclopentadienyl tricarbonyl, as Mn [12079-65-1]0.1 mg/m3Skin
Mercury – Alkyl compounds, as Hg [7439-97-6]0.01 mg/m30.03 mg/m3Skin
Mercury – Aryl compounds, as Hg [7439-97-6]0.05 mg/m3C 0.1 mg/m3Skin
Mercury – Elemental, as Hg [7439-97-6]0.025 mg/m3Skin; R
Mercury – Inorganic compounds, as Hg [7439-97-6]0.025 mg/m3Skin; R
Mercury – Methyl, as Hg [7439-97-6]0.01 mg/m30.03 mg/m3Skin; 2B
Mesityl oxide [141-79-7]10 ppm25 ppm
Methacrylic acid [79-41-4]20 ppm
Methane [74-82-8] Revised 2004 See Aliphatic Hydrocarbon gases [C1-C4] Revised 2008
Methanol [67-56-1]200 ppm250 ppmSkin
Methomyl [16752-77-5]2.5 mg/m3
Methoxychlor [72-43-5]10 mg/m3
2-Methoxyethanol (EGME) [109-86-4] Revised 20060.1 ppmSkin; R
2-Methoxyethyl acetate (EGMEA) [110-49-6] Revised 20060.1 ppmSkin; R
Methoxyflurane [76-38-0]2 ppm
4-Methoxyphenol [150-76-5]5 mg/m3
1-Methoxy-2-propanol (PGME) [107-98-2]50 ppm75 ppm
2-Methoxy-1-propanol [1589-47-5]20 ppm40 ppm
1-Methoxypropyl-2-acetate [108-65-6]50 ppm75 ppm
2-Methoxypropyl-1-acetate [70657-70-4]20 ppm40 ppm
bis-(2-Methoxypropyl) ether (DPGME) (see Dipropylene glycol methyl ether) [34590-94-8]
Methyl acetate [79-20-9]200 ppm250 ppm
Methyl acetylene [74-99-7]1000 ppm
Methyl acetylene-propadiene mixture (MAPP) [59355-75-8]1000 ppm1250 ppm
Methyl acrylate [96-33-3]2 ppmSkin; S
Methylacrylonitrile [126-98-7]1 ppmSkin
Methylal (see Dimethoxymethane) [109-87-5]
Methylamine [74-89-5]5 ppm15 ppm
Methyl n-amyl ketone [110-43-0]50 ppm
N-Methyl aniline [100-61-8]0.5 ppmSkin
Methyl bromide [74-83-9]1 ppmSkin
Methyl tert-butyl ether (MTBE) [1634-04-4]50 ppmR
Methyl n-butyl ketone [591-78-6] Revised 20085 ppm10 ppmSkin; R
Methyl chloride [74-87-3]50 ppm100 ppmSkin; R
Methyl chloroform [71-55-6]350 ppm450 ppm
Methyl 2-cyanoacrylate [137-05-3]0.2 ppm
Methylcyclohexane [108-87-2]400 ppm
Methylcyclohexanol [25639-42-3]50 ppm
o-Methylcyclohexanone [583-60-8]50 ppm75 ppmSkin
2-Methylcyclopentadienyl manganese tricarbonyl, as Mn [12108-13-3]0.2 mg/m3Skin
Methyl demeton, Inhalable [8022-00-2] Revised 20070.05 mg/m3 (V)Skin
Methylene bisphenyl isocyanate (MDI) [101-68-8]0.005 ppmC 0.01 ppmSkin; S
4,4′-Methylene bis(2-chloroaniline) (MBOCA; MOCA) [101-14-4] Revised 20090.01 ppmSkin; A2, 1
Methylene bis (4-cyclo-hexyl-isocyanate), [5124-30-1]0.005 ppmC 0.01 ppm
Methylene chloride (See Dichloromethane)
4,4′-Methylene dianiline [101-77-9]0.01 ppmSkin; 2B
Methyl ethyl ketone (MEK) [78-93-3]50 ppm100 ppm
Methyl ethyl ketone peroxide (MEKP) [1338-23-4]C 0.2 ppm
Methyl formate [107-31-3]100 ppm150 ppmSkin
Methyl hydrazine [60-34-4]0.01 ppmSkin
Methyl iodide [74-88-4]2 ppmSkin
Methyl isoamyl ketone [110-12-3]50 ppm
Methyl isobutyl carbinol [108-11-2]25 ppm40 ppmSkin
Methyl isobutyl ketone [108-10-1] Revised 201120 ppm75 ppm2B
Methyl isocyanate [624-83-9]0.02 ppmSkin; S
Methyl isopropyl ketone [563-80-4] Revised 201120 ppm
Methyl mercaptan [74-93-1]0.5 ppm
Methyl methacrylate [80-62-6]50 ppm100 ppmS
1-Methyl naphthalene [90-12-0] Revised 20070.5 ppmSkin
2-Methyl naphthalene [91-57-6] Revised 20070.5 ppmSkin
Methyl parathion [298-00-0] Revised 2009; 20100.2 mg/m3Skin
Methyl propyl ketone (2-pentanone) [107-87-9]150 ppm250 ppm
Methyl silicate [681-84-5]1 ppm
alpha-Methyl styrene [98-83-9] Revised 201510 ppmR; 2B
Methyl vinyl ketone [78-94-4]C 0.2 ppmSkin; S
Metribuzin [21087-64-9]5 mg/m3
Mevinphos, Inhalable [7786-34-7] Revised 20030.01 mg/m3 (V)Skin
Mica, Respirable [12001-26-2]3 mg/m3
Molybdenum – Metal and insoluble compounds, Respirable [7439-98-7]3 mg/m3
Molybdenum – Metal and insoluble compounds, Inhalable [7439-98-7]10 mg/m3
Molybdenum – Soluble compounds, as Mo, Respirable [7439-98-7]0.5 mg/m3
Monochloroacetic acid [79-11-8] See Chloroacetic acid
Monocrotophos, Inhalable [6923-22-4]0.05 mg/m3 (V)Skin
Morpholine [110-91-8]20 ppmSkin
Naled, Inhalable [300-76-5]0.1 mg/m3(V)Skin; S
Naphthalene [91-20-3]10 ppm15 ppmSkin; 2B
1,5-Naphthalene diisocyanate [3173-72-6]0.005 ppmC 0.01 ppm
beta-Naphthylamine [91-59-8](L)A1, 1
Natural gas [8006-14-2] Revised 2004 See Aliphatic Hydrocarbon gases [C1-C4] Revised 2008
Natural rubber latex, as total proteins, Inhalable [9006-04-6] Revised 2004; 2008; 20100.001 mg/m3Skin; S
Neon [7440-01-9]Simple asphyxiant
Nickel – Insoluble inorganic compounds, as Ni [7440-02-0]0.05 mg/m3A1, 1; (I)
Nickel – Elemental, Soluble inorganic compounds, as Ni [7440-02-0]0.05 mg/m3A1, 1, 2B; (I)
Nickel carbonyl, as Ni [13463-39-3]0.001 ppm1; (I)
Nickel subsulfide, as Ni, Inhalable [12035-72-2]0.1 mg/m3A1, 1
Nicotine [54-11-5]0.5 mg/m3Skin
Nitrapyrin [1929-82-4]10 mg/m3(N)20 mg/m3
Nitric acid [7697-37-2]2 ppm4 ppm
Nitric oxide [10102-43-9]25 ppm
p-Nitroaniline [100-01-6]3 mg/m3Skin
Nitrobenzene [98-95-3]1 ppmSkin; 2B
p-Nitrochlorobenzene [100-00-5]0.1 ppmSkin
4-Nitrodiphenyl [92-93-3](L)Skin; A2
Nitroethane [79-24-3]100 ppm
Nitrogen [7727-37-9]Simple asphyxiant
Nitrogen dioxide [10102-44-0]C 1 ppm
Nitrogen trifluoride [7783-54-2]10 ppm
Nitroglycerin (NG) [55-63-0]0.05 ppmSkin
Nitromethane [75-52-5]20 ppm2B
1-Nitropropane [108-03-2]25 ppm
2-Nitropropane [79-46-9]5 ppm2B
Nitropyrene, mono, di, tri, tetra, isomers [5522-43-0; 57835-92-4](I)
n-Nitrosodiethanolamine [1116-54-7]2B
n-Nitrosodiethylamine [55-18-5]2A
n-Nitrosodimethylamine [62-75-9](L)Skin; 2A
n-Nitrosomethylethylamine [10595-95-6]2B
n-Nitrosomorpholine [59-89-2]2B
n-Nitrosopiperidine [100-75-4]2B
n-Nitrosopyrrolidine [930-55-2]2B
Nitrotoluene, all isomers [88-72-2; 99-08-1; 99-99-0]2 ppmSkin; 2A; (I)
5-Nitro-o-toluidine, Inhalable [99-55-8] Revised 20071 mg/m3
Nitrous oxide [10024-97-2]25 ppmR
Nonane [111-84-2] Revised 2015200 ppm
Octachloronaphthalene [2234-13-1]0.1 mg/m30.3 mg/m3Skin
Octane, all isomers [111-65-9]300 ppm
Oil mist – mineral, mildly refined0.2 mg/m31
Oil mist – mineral, severely refined1 mg/m3
Osmium tetroxide [20816-12-0]0.0002 ppm0.0006 ppm
Oxalic acid, anhydrous [144-62-7] Revised 20151 mg/m32 mg/m3
Oxalic acid, dihydrate [6153-56-6](I)
p,p’-Oxybis(benzenesulfonyl hydrazide), Inhalable [80-51-3] Revised 20080.1 mg/m3R
Oxygen difluoride [7783-41-7]C 0.05 ppm
Ozone – Heavy work [10028-15-6]0.05 ppm
Ozone – Moderate work [10028-15-6]0.08 ppm
Ozone – Light work [10028-15-6]0.1 ppm
Ozone – Light, mod., or heavy workload =/< 2 hrs [10028-15-6]0.2 ppm
Paraffin wax fume [8002-74-2]2 mg/m3
Paraquat, Respirable [4685-14-7]0.1 mg/m3
Paraquat [4685-14-7]0.5 mg/m3
Parathion, Inhalable [56-38-2] Revised 20030.05 mg/m3 (V)Skin
Particles (Insoluble or Poorly Soluble) Not Otherwise Classified (PNOC)10 mg/m3(N)
Pentaborane [19624-22-7]0.005 ppm0.015 ppm
Pentachloronaphthalene [1321-64-8]0.5 mg/m3Skin
Pentachloronitrobenzene [82-68-8]0.5 mg/m3
Pentachlorophenol [87-86-5]0.5 mg/m3Skin; 2B
Pentaerythritol [115-77-5]10 mg/m3(N)
Pentane, all isomers [78-78-4; 109-66-0; 463-82-1]600 ppm
2,4-Pentanedione [123-54-6](I)
Pentyl acetate, all isomers [628-63-7; 626-38-0; 123-92-2; 625-16-1; 624-41-9; 620-11-1]50 ppm100 ppm
Peracetic acid [79-21-0](I)
Perchloroethylene (See Tetrachloroethylene)
Perchloromethyl mercaptan [594-42-3]0.1 ppm
Perchloryl fluoride [7616-94-6]3 ppm6 ppm
Perfluorobutyl ethylene [19430-93-4] Revised 2004100 ppm
Perfluoroisobutylene [382-21-8]C 0.01 ppm
Perlite [93763-70-3] Revised 2006 (See Particles Not Otherwise Classified (PNOC))
Persulfates, as persulfate0.1 mg/m3
Phenol [108-95-2]5 ppmSkin
Phenothiazine [92-84-2]5 mg/m3Skin
N-Penyl-beta-naphthylamine [135-88-6]
o-Phenylenediamine [95-54-5]0.1 mg/m3
m-Phenylenediamine [108-45-2]0.1 mg/m3
p-Phenylenediamine [106-50-3]0.1 mg/m3S
Phenyl ether – Vapour (Diphenyl ether) [101-84-8]1 ppm2 ppm
Phenyl glycidyl ether (PGE) [122-60-1] Revised 20080.1 ppmSkin; 2B; S; R
Phenyl isocyanate [103-71-9]0.005 ppmC 0.01 ppmSkin; S
Phenylhydrazine [100-63-0]0.1 ppmSkin
Phenyl mercaptan [108-98-5]C 0.1 ppm
Phenylphosphine [638-21-1]C 0.05 ppmR
Phorate, Inhalable [298-02-2] Revised 20050.05 mg/m3 (V)Skin
Phosgene [75-44-5]0.1 ppm
Phosphine [7803-51-2]0.3 ppm1 ppm
Phosphoric acid [7664-38-2]1 mg/m33 mg/m3
Phosphorus (yellow) [12185-10-3]0.1 mg/m3
Phosphorus oxychloride [10025-87-3]0.1 ppm
Phosphorus pentachloride [10026-13-8]0.1 ppm
Phosphorus pentasulfide [1314-80-3]1 mg/m33 mg/m3
Phosphorus trichloride [7719-12-2]0.2 ppm0.5 ppm
Phthalic anhydride [85-44-9]1 ppmS
m-Phthalodinitrile [626-17-5] Revised 20095 mg/m3(V)
o-Phthalodinitrile [91-15-6](I)
Picloram [1918-02-1]10 mg/m3(N)
Picric acid [88-89-1]0.1 mg/m3S
Pindone [83-26-1]0.1 mg/m3
Piperazine and its Salts, as Piperazine [110-85-0]0.3 mg/m31 mg/m3S
Piperidine [110-89-4]1 ppm
Plaster of Paris [26499-65-0]10 mg/m3(N)20 mg/m3
Platinum – Metal [7440-06-4]1 mg/m3
Platinum – Soluble salts (as Pt) [7440-06-4]0.002 mg/m3S
Polyvinyl chloride (PVC), Respirable [9002-86-2] Revised 20081 mg/m3
Portland cement, Respirable [65997-15-1] Revised 20151 mg/m3(E)
Potassium hydroxide [1310-58-3]C 2 mg/m3
Propane [74-98-6] Revised 2004 See Aliphatic Hydrocarbon gases [C1-C4] Revised 2008
Propane sultone [1120-71-4](L)2B
n-Propanol (n-Propyl alcohol) [71-23-8] Revised 2007100 ppm
Propargyl alcohol [107-19-7]1 ppmSkin
beta-Propiolactone [57-57-8]0.5 ppm2B
Propionaldehyde [123-38-6]20 ppm
Propionic acid [79-09-4]10 ppm
Propoxur [114-26-1]0.5 mg/m3
n-Propyl acetate [109-60-4]200 ppm250 ppm
Propylene [115-07-1] Revised 2006500 ppm
Propylene dichloride [78-87-5] Revised 200675 ppm110 ppmS
Propylene glycol dinitrate [6423-43-4]0.05 ppmSkin
Propylene oxide [75-56-9]2 ppm2B; S
Propyleneimine [75-55-8] Revised 2009; 20102 ppm2B
n-Propyl nitrate [627-13-4]25 ppm40 ppm
Pyrethrum [8003-34-7]5 mg/m3S
Pyridine [110-86-1] Revised 20041 ppm
Quinone [106-51-4]0.1 ppm
Resorcinol [108-46-3]10 ppm20 ppm
Rhodium, Metal and insoluble compounds as Rh [7440-16-6]0.1 mg/m30.3 mg/m3
Rhodium – Soluble compounds, as Rh [7440-16-6]0.001 mg/m30.003 mg/m3
Ronnel, Inhalable [299-84-3] Revised 20065 mg/m3(V)
Rosin core solder thermal decomposition products (colophony) [8050-09-7](L)S
Rotenone (commercial) [83-79-4]5 mg/m3
Rouge [1309-37-1]10 mg/m3(E,N)
Rubber solvent (Naphtha) [8030-30-6] Revised 2009(H)
Selenium and compounds, as Se [7782-49-2]0.1 mg/m3
Selenium hexafluoride [7783-79-1]0.05 ppm
Sesone [136-78-7]10 mg/m3(N)
Silica, Amorphous – Diatomaceous earth (uncalcined) Total [61790-53-2]4 mg/m3
Silica, Amorphous – Diatomaceous earth (uncalcined), Respirable [61790-53-2]1.5 mg/m3
Silica, Amorphous – Fume Total [69012-64-2]4 mg/m3
Silica, Amorphous – Fume, Respirable [69012-64-2]1.5 mg/m3
Silica, Amorphous – Precipitated and gel, Total [112926-00-8]4 mg/m3
Silica, Amorphous – Precipitated and gel, Respirable [112926-00-8]1.5 mg/m3
Silica, Crystalline – alpha quartz [14808-60-7; 1317-95-9] and Cristobalite, Respirable [14464-46-1] Revised 20060.025 mg/m3A2, 1
Silicon [7440-21-3] Revised 2006 (See Particles Not Otherwise Classified (PNOC))
Silicon carbide Nonfibrous, Inhalable, [409-21-2] Revised 200310 mg/m3(E)
Silicon carbide, Nonfibrous, Respirable, [409-21-2] Revised 20033 mg/m3(E)
Silicon carbide, Fibrous (including whiskers) [409-21-2] Revised 20030.1 f/cc (F)A2
Silicon tetrahydride (Silane) [7803-62-5]0.5 ppm1 ppm
Silver and Compounds (as Ag) [7440-22-4]0.01 mg/m30.03 mg/m3
Soapstone (see Talc) Revised 2011
Sodium azide (as Sodium azide) [26628-22-8]C 0.29 mg/m3
Sodium azide (as Hydrazoic acid vapour) [26628-22-8]C 0.11 ppm
Sodium bisulfite [7631-90-5]5 mg/m3
Sodium fluoroacetate [62-74-8]0.05 mg/m3Skin
Sodium hydroxide [1310-73-2]C 2 mg/m3
Sodium metabisulfite [7681-57-4]5 mg/m3
Starch [9005-25-8]10 mg/m3(N)
Stearates10 mg/m3(J)
Stoddard solvent (mineral spirits) [8052-41-3]290 mg/m3580 mg/m3
Strontium chromate, as Cr [7789-06-2]0.0005 mg/m3A2
Strychnine [57-24-9]0.15 mg/m3
Styrene – monomer [100-42-5]50 ppm75 ppm2B
Subtilisins, as crystalline active enzyme [1395-21-7; 9014-01-1]C 0.00006 mg/m3S
Sucrose [57-50-1]10 mg/m3(N)
Sulfometuron methyl [74222-97-2]5 mg/m3
Sulfotepp (TEDP), Inhalable [3689-24-5] Revised 20050.1 mg/m3(V)Skin
Sulfur dioxide [7446-09-5]2 ppm5 ppm
Sulfur hexafluoride [2551-62-4]1000 ppm
Sulfuric acid, Thoracic [7664-93-9] Revised 20040.2 mg/m3(M)A2, 1
Sulfur monochloride [10025-67-9]C 1ppm
Sulfur pentafluoride [5714-22-7]C 0.01 ppm
Sulfur tetrafluoride [7783-60-0]C 0.1 ppm
Sulfuryl fluoride [2699-79-8]5 ppm10 ppm
Sulprofos [35400-43-2] Revised 2009; 20101 mg/m3Skin
Synthetic Vitreous Fibres – Continuous filament glass fibres1 f/cc (F)
Synthetic Vitreous Fibres – Continuous filament glass fibres, Inhalable5 mg/m3
Synthetic Vitreous Fibres – Glass wool fibres1 f/cc (F)
Synthetic Vitreous Fibres – Rock wool fibres1 f/cc (F)
Synthetic Vitreous Fibres -Slag wool fibres1 f/cc (F)
Synthetic Vitreous Fibres – Special purpose glass fibres1 f/cc (F)2B
Synthetic Vitreous Fibres – Refractory ceramic fibres0.2 f/cc (F)A2, 2B
2,4,5-T (2,4,5-Trichlorophenoxyacetic acid) [93-76-5]10 mg/m3
Talc – Containing no asbestos fibres, Respirable [14807-96-6]2 mg/m3(E)
Talc – Containing asbestos fibres [14807-96-6]0.1 f/cc (K)A1, 1
Tantalum – Metal [7440-25-7]5 mg/m3
Tantalum oxide dusts, as Ta [1314-61-0]5 mg/m3
Tellurium and compounds (NOS), as Te, excluding hydrogen telluride [13494-80-9]0.1 mg/m3
Tellurium hexafluoride [7783-80-4]0.02 ppm
Temephos, Inhalable [3383-96-8] Revised 20051 mg/m3(V)Skin
Terbufos, Inhalable [13071-79-9]0.01 mg/m3 (V)Skin
Terepthalic acid [100-21-0]10 mg/m3(N)
Terphenyls [26140-60-3]C 5 mg/m3
1,1,2,2-Tetrabromoethane, Inhalable [79-27-6] Revised 20060.1 ppm (V)
1,1,1,2-Tetrachloro-2,2-difluoroethane [76-11-9] Revised 2008; 2010500 ppm
1,1,2,2-Tetrachloro-1,2-difluoroethane [76-12-0] Revised 2008; 2010200 ppm
1,1,2,2-Tetrachloroethane [79-34-5]1 ppmSkin; 2B
Tetrachloroethylene (Perchloroethylene) [127-18-4]25 ppm100 ppm2A
Tetrachloronaphthalene [1335-88-2]2 mg/m3
Tetraethyl lead, as Pb [78-00-2]0.075 mg/m3Skin
Tetraethyl pyrophosphate (TEPP), Inhalable [107-49-3] Revised 20070.01 mg/m (V)Skin
Tetrafluoroethylene [116-14-3]2 ppm2B
Tetrahydrofuran [109-99-9] Revised 200550 ppm100 ppmSkin
Tetramethyl lead, as Pb [75-74-1]0.075 mg/m3Skin
Tetramethyl succinonitrile [3333-52-6]0.5 ppmSkin
Tetranitromethane [509-14-8]0.005 ppm2B
Tetrakis (hydroxymethyl) phosphonium chloride [124-64-1] Revised 20052 mg/m3
Tetrakis (hydroxymethyl) phosphonium sulfate [55566-30-8] Revised 20052 mg/m3S
Tetryl [479-45-8]1.5 mg/m3S
Thallium and soluble compounds, as Tl, Inhalable [7440-28-0] Revised 20110.02 mg/m3Skin
4,4′-Thiobis (6-tert-butyl-m-cresol) Inhalable [96-69-5] Revised 20111 mg/m3Skin
Thioglycolic acid [68-11-1]1 ppmSkin
Thionyl chloride [7719-09-7]C 1ppm
Thiram [137-26-8] Revised 2008; 20101 mg/m3S
Tin – Metal [7440-31-5]2 mg/m3
Tin – Oxide and inorganic compounds, except tin hydride, as Sn [7440-31-6]2 mg/m3
Tin – Organic compounds, as Sn [7440-31-6]0.1 mg/m30.2 mg/m3Skin
Titanium dioxide [13463-67-7] Revised 200610 mg/m3(N)2B
o-Tolidine [119-93-7]Skin; 2B
Toluene [108-88-3] Revised 2007; 200820 ppmR
Toluene-2,4-diisocyanate (2,4-TDI) [584-84-9]0.005 ppmC 0.01 ppm2B; S
Toluene-2,6-diisocyanate (2,6-TDI) [91-08-7]0.005 ppmC 0.01 ppm2B; S
o-Toluidine [95-53-4] Revised 20092 ppmSkin; 1
m-Toluidine [108-44-1]2 ppmSkin
p-Toluidine [106-49-0]2 ppmSkin
Tributyl phosphate [126-73-8]0.2 ppm
Trichloroacetic acid [76-03-9]1 ppm2B
1,2,4-Trichlorobenzene [120-82-1]C 5 ppm
1,1,2-Trichloroethane [79-00-5]10 ppmSkin
Trichloroethylene [79-01-6] Revised 200710 ppm25 ppmA2, 1
Trichlorofluoromethane [75-69-4]C 1000 ppm
Trichloronaphthalene [1321-65-9]5 mg/m3Skin
1,2,3-Trichloropropane [96-18-4]10 ppmSkin; A2, 2A
1,1,2-Trichloro-1,2,2-trifluoroethane [76-13-1]500 ppm1250 ppm
Trichlorphon, Inhalable [52-68-6] Revised 20031 mg/m3
Triethanolamine [102-71-6]5 mg/m3
Triethylamine [121-44-8]1 ppm3 ppmSkin
Trifluorobromomethane [75-63-8]1000 ppm
1,3,5-Triglycidyl-s-triazinetrione [2451-62-9]0.05 mg/m3R; S
Trimellitic anhydride [552-30-7] Revised 2008; 2010C 0.04 mg/m3Skin; S
Trimethylamine [75-50-3]5 ppm15 ppm
Trimethyl benzene (mixed isomers) [25551-13-7]25 ppm
Trimethyl hexamethylene diisocyanate [28679-16-5]0.005 ppmC 0.01 ppm
Trimethyl phosphite [121-45-9]2 ppm
Tri-n-Butyltin compounds [688-73-3]0.05 mg/m3
2,4,6-Trinitrotoluene (TNT) [118-96-7]0.1 mg/m3Skin
Triorthocresyl phosphate [78-30-8]0.1 mg/m3Skin
Triphenyl phosphate [115-86-6]3 mg/m3
Tungsten – Metal and insoluble compounds [7440-33-7]5 mg/m310 mg/m3
Tungsten – Soluble compounds, as W [7440-33-7]1 mg/m33 mg/m3
Turpentine [8006-64-2] and selected monoterpenes [80-56-8; 127-91-3; 13466-78-9] Revised 200320 ppmS
Uranium (Natural) – Insoluble compounds, as U [7440-61-1]0.2 mg/m30.6 mg/m3A1, 1; (I)
Uranium (Natural) – Soluble compounds, as U [7440-61-1]0.05 mg/m3A1, 1; (I)
n-Valeraldehyde [110-62-3]50 ppm
Vanadium pentoxide, as V, Inhalable [1314-62-1] Revised 20150.05 mg/m32B
Vegetable oil – Mist, except castor, cashew nut, or similar irritant oils [8008-89-7]10 mg/m3
Vegetable oil, Mist, Respirable, except castor, cashew nut, or similar irritating oil [8008-89-7]3 mg/m3
Vinyl acetate [108-05-4]10 ppm15 ppm2B
Vinyl bromide [593-60-2]0.5 ppmA2, 2A
Vinyl chloride [75-01-4]1 ppmA1, 1
4-Vinyl cyclohexene [100-40-3]0.1 ppm2B; R
Vinyl cyclohexene dioxide [106-87-6]0.1 ppmSkin; 2B; R
Vinyl fluoride [75-02-5]1 ppmA2, 2A
N-Vinyl-2-pyrrolidone [88-12-0] Revised 20030.05 ppm
Vinylidene chloride [75-35-4]1 ppm
Vinylidene fluoride [75-38-7]500 ppm
Vinyl toluene, all isomers [25013-15-4]25 ppm75 ppm
VM & P Naphtha [8032-32-4] Revised 2009(H)
Warfarin [81-81-2]0.1 mg/m3
Wood dust – Allergenic species1 mg/m3A1, A2, 1; (I)
Wood dust – Non-Allergenic Hardwood1 mg/m3A1, A2, 1; (I)
Wood dust – Non-Allergenic Softwood2.5 mg/m31
Xylene [1330-20-7] (o, m & p isomers) [95-47-6; 108-38-3; 106-42-3]100 ppm150 ppm
m-Xylene alpha,alpha’-diamine [1477-55-0]C 0.1 mg/m3Skin
Xylidine – Mixed isomers, Inhalable [1330-73-8]0.5 ppm (V)Skin
Yttrium – Metal [7440-65-5]1 mg/m3
Yttrium and compounds, as Y [7440-65-5]1 mg/m3
Zinc chloride – Fume [7646-85-7]1 mg/m32 mg/m3
Zinc chromates, as Cr [13530-65-9; 11103-86-9; 37300-23-5]0.01 mg/m3A1, 1; (I)
Zinc oxide, Respirable [1314-13-2] Revised 20032 mg/m310 mg/m3
Zinc stearate [557-05-1]10 mg/m3(N)20 mg/m3
Zirconium [7440-67-7] and compounds, as Zr [7440-67-7]5 mg/m310 mg/m3

 

Endnotes

1, 2A and 2B indicate substances designated as carcinogens

(C) – Ceiling limit.
(E) – the value is for particulate matter containing no asbestos and less than 1% crystalline silica.
(F) – the value for fibers longer than 5 microns, with an aspect ratio of equal than/greater than 3:1, as determined by the membrane filter method at 400 – 450 times magnification (4 mm objective), using phase-contrast illumination.
(G) – as measured by the vertical elutriator, cotton-dust sampler, see TLV Documentation.
(H) – reciprocal calculation method based on OHS Guideline G5.48-12.
(I) – see Special Notes
(J) – does not include stearates of toxic metals.
(K) – should not exceed 2 mg/m3 respirable particulate.
(L) – No exposure limit. Exposure by all routes should be carefully controlled to levels as low as possible.
(M) – refers to sulfuric acid contained in strong inorganic acid mists.
(N) – the 8-hour TWA listed in the Table is for the total dust. The substance also has an 8-hour TWA of 3 mg/m3 for the respirable fraction.
(O) – sampled by method that does not collect vapour.
(P) – application restricted to conditions in which there are negligible aerosol exposures.
(R) – substance has an adverse reproductive effect.
(S) –  indicates that the substance is a sensitizer.
(V) – vapour and inhalable aerosol.

 

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