Permissible Exposure Levels under Singapore WSH (General Provisions) Regulations
Source: https://sso.agc.gov.sg/SL/WSHA2006-RG1#Sc1-
| Toxic Substance | PEL (Long Term) ppm | PEL (Long Term) mg/m3 | PEL (Short Term) ppm | PEL (Short Term) mg/m3 |
|---|---|---|---|---|
| Acetaldehyde | NA | NA | 25 | 45 |
| Acetic acid | 10 | 25 | 15 | 37 |
| Acetic anhydride | 5 | 21 | NA | NA |
| Acetone | 750 | 1780 | 1000 | 2380 |
| Acetone cyanohydrin | NA | NA | 4.7 | 5 |
| Acetonitrile | 40 | 67 | 60 | 101 |
| Acetophenone | 10 | 49 | NA | NA |
| Acetylene tetrabromide | 1 | 14 | NA | NA |
| Acrolein | 0.1 | 0.23 | 0.3 | 0.69 |
| Acrylamide | NA | 0.03 | NA | NA |
| Acrylic acid | 2 | 5.9 | NA | NA |
| Acrylonitrile (Vinyl cyanide) | 2 | 4.3 | NA | NA |
| Adipic acid | NA | 5 | NA | NA |
| Adiponitrile | 2 | 8.8 | NA | NA |
| Aldrin | NA | 0.25 | NA | NA |
| Allyl alcohol | 2 | 4.8 | 4 | 9.5 |
| Allyl chloride | 1 | 3 | 2 | 6 |
| Allyl glycidyl ether (AGE) | 5 | 23 | 10 | 47 |
| Allyl propyl disulfide | 2 | 12 | 3 | 18 |
| Aluminium Metal dust | NA | 10 | NA | NA |
| Pyro powders, as Aluminium | NA | 5 | NA | NA |
| Welding fumes, as Aluminium | NA | 5 | NA | NA |
| Soluble salts, as Aluminium | NA | 2 | NA | NA |
| Alkyls, as Aluminium | NA | 2 | NA | NA |
| Aluminium oxide | NA | 10 | NA | NA |
| 2-Aminopyridine | 0.5 | 1.9 | NA | NA |
| Amitrole | NA | 0.2 | NA | NA |
| Ammonia | 25 | 17 | 35 | 24 |
| Ammonium chloride fume | NA | 10 | NA | 20 |
| Ammonium perfluorooctanoate | NA | 0.01 | NA | NA |
| Ammonium sulfamate | NA | 10 | NA | NA |
| n-Amyl acetate | 100 | 532 | NA | NA |
| sec-Amyl acetate | 125 | 665 | NA | NA |
| Aniline | 2 | 7.6 | NA | NA |
| Anisidine | 0.1 | 0.5 | NA | NA |
| Antimony and compounds, as Sb | NA | 0.5 | NA | NA |
| Antimony trioxide, as Sb | NA | 0.5 | NA | NA |
| Arsenic, elemental and inorganic compounds, as As | NA | 0.01 | NA | NA |
| Arsine | 0.05 | 0.16 | NA | NA |
| Asbestos (all forms) | NA | 0.1 (fibre/cc) | NA | NA |
| Asphalt (petroleum) fumes | NA | 5 | NA | NA |
| Atrazine | NA | 5 | NA | NA |
| Azinphos-methyl | NA | 0.2 | NA | NA |
| Barium, soluble compounds, as Ba | NA | 0.5 | NA | NA |
| Barium sulfate | NA | 10 | NA | NA |
| Benomyl | 0.84 | 10 | NA | NA |
| Benzene | 1 | 3.18 | NA | NA |
| Benzoyl peroxide | NA | 5 | NA | NA |
| Benzyl chloride | 1 | 5.2 | NA | NA |
| Beryllium and compounds, as Be | NA | 0.002 | NA | NA |
| Biphenyl | 0.2 | 1.3 | NA | NA |
| Bismuth telluride, Undoped | NA | 10 | NA | NA |
| Bismuth telluride, Se-doped | NA | 5 | NA | NA |
| Borates, tetra sodium salts, Anhydrous | NA | 1 | NA | NA |
| Borates, tetra sodium salts,Decahydrate | NA | 5 | NA | NA |
| Borates, tetra sodium salts,Pentahydrate | NA | 1 | NA | NA |
| Boron oxide | NA | 10 | NA | NA |
| Boron tribromide | NA | NA | 1 | 10 |
| Boron trifluoride | NA | NA | 1 | 2.8 |
| Bromacil | NA | 10 | NA | NA |
| Bromine | 0.1 | 0.66 | 0.2 | 1.3 |
| Bromine pentafluoride | 0.1 | 0.72 | NA | NA |
| Bromoform | 0.5 | 5.2 | NA | NA |
| 1,3-Butadiene | 2 | 4.4 | NA | NA |
| Butane | 800 | 1900 | NA | NA |
| n-Butanol | NA | NA | 50 | 152 |
| sec-Butanol | 100 | 303 | NA | NA |
| tert-Butanol | 100 | 303 | NA | NA |
| 2-Butoxyethanol (EGBE) | 25 | 121 | NA | NA |
| n-Butyl acetate | 150 | 713 | 200 | 950 |
| sec-Butyl acetate | 200 | 950 | NA | NA |
| tert-Butyl acetate | 200 | 950 | NA | NA |
| n-Butyl acrylate | 10 | 52 | NA | NA |
| n-Butylamine | NA | NA | 5 | 15 |
| tert-Butyl chromate, as CrO3 | NA | NA | NA | 0.1 |
| n-Butyl glycidyl ether (BGE) | 25 | 133 | NA | 0.1 |
| n-Butyl lactate | 5 | 30 | NA | NA |
| Butyl mercaptan (Butanethiol) | 0.5 | 1.8 | NA | NA |
| o-sec-Butylphenol | 5 | 31 | NA | NA |
| p-tert-Butyl toluene | 1 | 6.1 | NA | NA |
| Cadmium, Elemental | NA | 0.01 | NA | NA |
| Cadmium, Compounds | NA | 0.002 | NA | NA |
| Calcium carbonate (Limestone, Marble) | NA | 10 | NA | NA |
| Calcium chromate, as Cr | NA | 0.001 | NA | NA |
| Calcium cyanamide | NA | 0.5 | NA | NA |
| Calcium cyanide | NA | NA | NA | 5 |
| Calcium hydroxide | NA | 5 | NA | NA |
| Calcium oxide | NA | 2 | NA | NA |
| Calcium silicate | NA | 10 | NA | NA |
| Calcium sulfate | NA | 10 | NA | NA |
| Camphor | 2 | 12 | 3 | 19 |
| Caprolactam, Dust | NA | 1 | NA | 3 |
| Caprolactam, Vapour | 5 | 23 | 10 | 46 |
| Captafol | NA | 0.1 | NA | NA |
| Captan | NA | 5 | NA | NA |
| Carbaryl | NA | 5 | NA | NA |
| Carbofuran | NA | 0.1 | NA | NA |
| Carbon black | NA | 3.5 | NA | NA |
| Carbon dioxide | 5000 | 9000 | 30000 | 54000 |
| Carbon disulfide | 10 | 31 | NA | NA |
| Carbon monoxide | 25 | 29 | NA | NA |
| Carbon tetrabromide | 0.1 | 1.4 | 0.3 | 4.1 |
| Carbon tetrachloride, (Tetrachloromethane) | 5 | 31 | 10 | 63 |
| Carbonyl fluoride | 2 | 5.4 | 5 | 13 |
| Catechol (Pyrocatechol) | 5 | 23 | NA | NA |
| Cellulose | NA | 10 | NA | NA |
| Cesium hydroxide | NA | 2 | NA | NA |
| Chlordane | NA | 0.5 | NA | NA |
| Chlorinated camphene (Toxaphene) | NA | 0.5 | NA | NA |
| Chlorinated diphenyl oxide | NA | 0.5 | NA | NA |
| Chlorine | 0.5 | 1.5 | 1 | 2.9 |
| Chlorine dioxide | 0.1 | 0.28 | 0.3 | 0.83 |
| Chlorine trifluoride | NA | NA | 0.1 | 0.38 |
| Chloroacetaldehyde | NA | NA | 1 | 3.2 |
| Chloroacetone | NA | NA | 1 | 3.8 |
| 2-Chloroacetophenone (Phenacyl chloride) | 0.05 | 0.32 | NA | NA |
| Chloroacetyl chloride | 0.05 | 0.23 | 0.15 | 0.69 |
| Chlorobenzene (Monochlorobenzene) | 10 | 46 | NA | NA |
| o-Chlorobenzylidene malononitrile | NA | NA | 0.05 | 0.39 |
| Chlorobromomethane, (Bromochloromethane) | 200 | 1060 | NA | NA |
| Chlorodifluoromethane | 1000 | 3540 | NA | NA |
| Chlorodiphenyl (42% chlorine) | NA | 1 | NA | NA |
| Chlorodiphenyl (54% chlorine) | NA | 0.5 | NA | NA |
| Chloroform (Trichloromethane) | 10 | 49 | NA | NA |
| bis (Chloromethyl) ether | 0.001 | 0.0047 | NA | NA |
| 1-Chloro-1-nitropropane | 2 | 10 | NA | NA |
| Chloropentafluoroethane | 1000 | 6320 | NA | NA |
| Chloropicrin (Trichloronitromethane) | 0.1 | 0.67 | NA | NA |
| β;-Chloroprene (2-Chloro-1,3-butadiene) | 10 | 36 | NA | NA |
| 2-Chloropropionic acid | 0.1 | 0.44 | NA | NA |
| o-Chlorostyrene | 50 | 283 | 75 | 425 |
| o-Chlorotoluene | 50 | 259 | NA | NA |
| Chlorpyrifos | NA | 0.2 | NA | NA |
| Chromium, Metal and Cr III compounds | NA | 0.5 | NA | NA |
| Chromium, Water-soluble Cr VI compounds | NA | 0.05 | NA | NA |
| Chromium, Insoluble Cr VI compounds | NA | 0.01 | NA | NA |
| Chromyl chloride | 0.025 | 0.16 | NA | NA |
| Clopidol | NA | 10 | NA | NA |
| Coal, respirable dust | NA | 2 | NA | NA |
| Coal tar pitch volatiles (Polycylic aromatic hydrocarbons), as benzene solubles | NA | 0.2 | NA | NA |
| Cobalt, elemental and inorganic compounds, as Co | NA | 0.02 | NA | NA |
| Cobalt carbonyl, as Co | NA | 0.1 | NA | NA |
| Cobalt hydrocarbonyl, as Co | NA | 0.1 | NA | NA |
| Copper Fume | NA | 0.2 | NA | NA |
| Copper Dusts and mists | NA | 1 | NA | NA |
| Cotton dust, raw | NA | 0.2 | NA | NA |
| Cresol | 5 | 22 | NA | NA |
| Crotonaldehyde | 2 | 5.7 | NA | NA |
| Crufomate | NA | 5 | NA | NA |
| Cumene | 50 | 246 | NA | NA |
| Cyanamide | NA | 2 | NA | NA |
| Cyanogen | 10 | 21 | NA | NA |
| Cyanogen chloride | NA | NA | 0.3 | 0.75 |
| Cyclohexane | 300 | 1030 | NA | NA |
| Cyclohexanol | 50 | 206 | NA | NA |
| Cyclohexanone | 25 | 100 | NA | NA |
| Cyclohexene | 300 | 1010 | NA | NA |
| Cyclohexylamine | 10 | 41 | NA | NA |
| Cyclonite | NA | 1.5 | NA | NA |
| Cyclopentadiene | 75 | 203 | NA | NA |
| Cyclopentane | 600 | 1720 | NA | NA |
| Cyhexatin (Tricyclo hexyltin) | NA | 5 | NA | NA |
| DDT (Dichlorodiphenyltrichloroethane) | NA | 1 | NA | NA |
| Decaborane | 0.05 | 0.25 | 0.15 | 0.75 |
| Demeton | 0.01 | 0.11 | NA | NA |
| Diacetone alcohol, (4-Hydroxy-4-methyl-2-pentanone) | 50 | 238 | NA | NA |
| Diazinon | NA | 0.1 | NA | NA |
| Diazomethane | 0.2 | 0.34 | NA | NA |
| Diborane | 0.1 | 0.11 | NA | NA |
| 2-N-Dibutylaminoethanol | 0.5 | 3.5 | NA | NA |
| Dibutyl phenyl phosphate | 0.3 | 3.5 | NA | NA |
| Dibutyl phosphate | 1 | 8.6 | 2 | 17 |
| Dibutyl phthalate | NA | 5 | NA | NA |
| Dichloroacetylene | NA | NA | 0.1 | 0.39 |
| o-Dichlorobenzene | 25 | 150 | 50 | 301 |
| p-Dichlorobenzene | 10 | 60 | NA | NA |
| 1,4-Dichloro-2-butene | 0.005 | 0.025 | NA | NA |
| Dichlorodifluoromethane | 1000 | 4950 | NA | NA |
| 1,3-Dichloro-5,5-dimethyl hydantoin | NA | 0.2 | NA | 0.4 |
| 1,1-Dichloroethane, (Ethylidene chloride) | 100 | 405 | NA | NA |
| 1,2-Dichloroethylene, (Acetylene dichloride) | 200 | 793 | NA | NA |
| Dichloroethyl ether | 5 | 29 | 10 | 58 |
| Dichlorofluoromethane | 10 | 42 | NA | NA |
| 1,1-Dichloro-1-nitroethane | 2 | 12 | NA | NA |
| 1,3-Dichloropropene | 1 | 4.5 | NA | NA |
| 2,2-Dichloropropionic acid | 1 | 5.8 | NA | NA |
| Dichlorotetrafluoroethane | 1000 | 6990 | NA | NA |
| Dichlorvos | 0.1 | 0.9 | NA | NA |
| Dicrotophos | NA | 0.25 | NA | NA |
| Dicyclopentadiene | 5 | 27 | NA | NA |
| Dicyclopentadienyl iron | NA | 10 | NA | NA |
| Dieldrin | NA | 0.25 | NA | NA |
| Diethanolamine | 0.46 | 2 | NA | NA |
| Diethylamine | 5 | 15 | 15 | 45 |
| 2-Diethylaminoethanol | 2 | 9.6 | NA | NA |
| Diethylene triamine | 1 | 4.2 | NA | NA |
| Diethyl ketone | 200 | 705 | NA | NA |
| Diethyl phthalate | NA | 5 | NA | NA |
| Difluorodibromomethane | 100 | 858 | NA | NA |
| Diglycidyl ether (DGE) | 0.1 | 0.53 | NA | NA |
| Diisobutyl ketone (2,6-Dimethyl-4-heptanone) | 25 | 145 | NA | NA |
| Diisopropylamine | 5 | 21 | NA | NA |
| N,N-Dimethyl acetamide | 10 | 36 | NA | NA |
| Dimethylamine | 5 | 9.2 | 15 | 27.6 |
| Dimethylaniline , (N,N-Dimethylaniline) | 5 | 25 | 10 | 50 |
| Dimethylformamide | 10 | 30 | NA | NA |
| 1,1-Dimethylhydrazine | 0.5 | 1.2 | NA | NA |
| Dimethylphthalate | NA | 5 | NA | NA |
| Dimethyl sulfate | 0.1 | 0.52 | NA | NA |
| Dinitolmide (3,5-Dinitro-o-toluamide) | NA | 5 | NA | NA |
| Dinitrobenzene | 0.15 | 1 | NA | NA |
| Dinitro-o-cresol | NA | 0.2 | NA | NA |
| Dinitrotoluene | NA | 0.15 | NA | NA |
| Dioxane | 25 | 90 | NA | NA |
| Dioxathion | NA | 0.2 | NA | NA |
| Diphenylamine | NA | 10 | NA | NA |
| Dipropylene glycol methyl ether | 100 | 606 | 150 | 909 |
| Dipropyl ketone | 50 | 233 | NA | NA |
| Diquat, Total dust | NA | 0.5 | NA | NA |
| Diquat, Respirable dust | NA | 0.1 | NA | NA |
| Di-sec-octyl phthalate (Di (-2-ethylhexyl) phthalate) | NA | 5 | NA | 10 |
| Disulfiram | NA | 2 | NA | NA |
| Disulfoton | NA | 0.1 | NA | NA |
| 2,6-Di-tert-butyl-p-cresol | NA | 10 | NA | NA |
| Diuron | NA | 10 | NA | NA |
| Divinyl benzene | 10 | 53 | NA | NA |
| Emery | NA | 10 | NA | NA |
| Endosulfan | NA | 0.1 | NA | NA |
| Endrin | NA | 0.1 | NA | NA |
| Enflurane | 75 | 566 | NA | NA |
| Epichlorohydrin (1-Chloro-2, 3-epoxypropane) | 2 | 7.6 | NA | NA |
| EPN | NA | 0.1 | NA | NA |
| Ethanol (Ethyl alcohol) | 1000 | 1880 | NA | NA |
| Ethanolamine | 3 | 7.5 | 6 | 15 |
| Ethion | NA | 0.4 | NA | NA |
| 2-Ethoxyethanol (EGEE) | 5 | 18 | NA | NA |
| 2-Ethoxyethyl acetate (EGEEA) | 5 | 27 | NA | NA |
| Ethyl acetate | 400 | 1440 | NA | NA |
| Ethyl acrylate | 5 | 20 | 15 | 61 |
| Ethylamine | 5 | 9.2 | 15 | 27.6 |
| Ethyl amyl ketone (5-Methyl-3-heptanone) | 25 | 131 | NA | NA |
| Ethyl benzene | 100 | 434 | 125 | 543 |
| Ethyl bromide | 5 | 22 | NA | NA |
| Ethyl butyl ketone (3-Heptanone) | 50 | 234 | NA | NA |
| Ethyl chloride | 1000 | 2640 | NA | NA |
| Ethylene chlorohydrin | NA | NA | 1 | 3.3 |
| Ethylenediamine (1,2-Diaminoethane) | 10 | 25 | NA | NA |
| Ethylene dichloride (1,2-Dichloroethane) | 10 | 40 | NA | NA |
| Ethylene glycol | NA | NA | 50 | 127 |
| Ethylene glycol dinitrate | 0.05 | 0.31 | NA | NA |
| Ethylene oxide | 1 | 1.8 | NA | NA |
| Ethylenimine | 0.5 | 0.88 | NA | NA |
| Ethyl ether (Diethyl ether) | 400 | 1210 | 500 | 1520 |
| Ethyl formate | 100 | 303 | NA | NA |
| Ethylidene norbornene | NA | NA | 5 | 25 |
| Ethyl mercaptan (Ethanethiol) | 0.5 | 1.3 | NA | NA |
| N-Ethylmorpholine | 5 | 24 | NA | NA |
| Ethyl silicate | 10 | 85 | NA | NA |
| Fenamiphos | NA | 0.1 | NA | NA |
| Fensulfothion | NA | 0.1 | NA | NA |
| Fenthion | NA | 0.2 | NA | NA |
| Ferbam | NA | 10 | NA | NA |
| Ferrovanadium dust | NA | 1 | NA | 3 |
| Fibrous glass dust | NA | 10 | NA | NA |
| Fluorides, as F | NA | 2.5 | NA | NA |
| Fluorine | 1 | 1.6 | 2 | 3.1 |
| Fonofos | NA | 0.1 | NA | NA |
| Formaldehyde | NA | NA | 0.3 | 0.37 |
| Formamide | 10 | 18 | NA | NA |
| Formic acid | 5 | 9.4 | 10 | 19 |
| Furfural | 2 | 7.9 | NA | NA |
| Furfuryl alcohol | 10 | 40 | 15 | 60 |
| Gasoline | 300 | 890 | 500 | 1480 |
| Germanium tetrahydride | 0.2 | 0.63 | NA | NA |
| Glutaraldehyde | NA | NA | 0.2 | 0.82 |
| Glycerin mist | NA | 10 | NA | NA |
| Glycidol (2,3-Epoxy-1-propanol) | 25 | 76 | NA | NA |
| Grain dust (oat, wheat, barley) | NA | 4 | NA | NA |
| Graphite, respirable dust | NA | 2 | NA | NA |
| Hafnium | NA | 0.5 | NA | NA |
| Halothane | 50 | 404 | NA | NA |
| Heptachlor and Heptachlor epoxide | NA | 0.05 | NA | NA |
| Heptane | 400 | 1640 | 500 | 2050 |
| Hexachlorobenzene | NA | 0.025 | NA | NA |
| Hexachlorobutadiene | 0.02 | 0.21 | NA | NA |
| Hexachlorocyclopentadiene | 0.01 | 0.11 | NA | NA |
| Hexachloroethane | 1 | 9.7 | NA | NA |
| Hexachloronaphthalene | NA | 0.2 | NA | NA |
| Hexafluoroacetone | 0.1 | 0.68 | NA | NA |
| Hexamethylene diisocyanate | 0.005 | 0.034 | NA | NA |
| 1,6-Hexanediamine | 0.5 | 2.3 | NA | NA |
| Hexane (n-Hexane) | 50 | 176 | NA | NA |
| Other isomers | 500 | 1760 | 1000 | 3500 |
| sec-Hexyl acetate | 50 | 295 | NA | NA |
| Hexylene glycol | NA | NA | 25 | 121 |
| Hydrazine | 0.1 | 0.13 | NA | NA |
| Hydrogenated terphenyls | 0.5 | 4.9 | NA | NA |
| Hydrogen bromide | NA | NA | 3 | 9.9 |
| Hydrogen chloride | NA | NA | 5 | 7.5 |
| Hydrogen cyanide | NA | NA | 4.7 | 5 |
| Hydrogen fluoride | NA | NA | 3 | 2.6 |
| Hydrogen peroxide | 1 | 1.4 | NA | NA |
| Hydrogen selenide | 0.05 | 0.16 | NA | NA |
| Hydrogen sulfide | 10 | 14 | 15 | 21 |
| Hydroquinone (Dihydroxy benzene) | NA | 2 | NA | NA |
| 2-Hydroxypropyl acrylate | 0.5 | 2.8 | NA | NA |
| Indene | 10 | 48 | NA | NA |
| Indium and compounds, as In | NA | 0.1 | NA | NA |
| Iodine | NA | NA | 0.1 | 1 |
| Iodoform | 0.6 | 10 | NA | NA |
| Iron oxide dust and fume, as Fe | NA | 5 | NA | NA |
| Iron pentacarbonyl, as Fe | 0.1 | 0.23 | 0.2 | 0.45 |
| Iron salts, soluble, as Fe | NA | 1 | NA | NA |
| Isoamyl acetate | 100 | 532 | NA | NA |
| Isoamyl alcohol | 100 | 361 | 125 | 452 |
| Isobutyl acetate | 150 | 713 | NA | NA |
| Isobutyl alcohol | 50 | 152 | NA | NA |
| Isooctyl alcohol | 50 | 266 | NA | NA |
| Isophorone | NA | NA | 5 | 28 |
| Isophorone diisocyanate | 0.005 | 0.045 | NA | NA |
| Isoproproxyethanol | 25 | 106 | NA | NA |
| Isopropyl acetate | 250 | 1040 | 310 | 1290 |
| Isopropyl alcohol | 400 | 983 | 500 | 1230 |
| Isopropylamine | 5 | 12 | 10 | 24 |
| N-Isopropylaniline | 2 | 11 | NA | NA |
| Isopropyl ether | 250 | 1040 | 310 | 1300 |
| Isopropyl glycidyl ether (IGE) | 50 | 238 | 75 | 356 |
| Kaolin, respirable dust | NA | 2 | NA | NA |
| Ketene | 0.5 | 0.86 | 1.5 | 2.6 |
| Lead, inorganic dusts and fumes, as Pb | NA | 0.15 | NA | NA |
| Lead arsenate | NA | 0.15 | NA | NA |
| Lead chromate, as Pb | NA | 0.05 | NA | NA |
| Lead chromate, as Cr | NA | 0.012 | NA | NA |
| Lindane | NA | 0.5 | NA | NA |
| Lithium hydride | NA | 0.025 | NA | NA |
| L.P.G. (Liquified petroleum gas) | 1000 | 1800 | NA | NA |
| Magnesite | NA | 10 | NA | NA |
| Magnesium oxide fume | NA | 10 | NA | NA |
| Malathion | NA | 10 | NA | NA |
| Maleic anhydride | 0.25 | 1 | NA | NA |
| Manganese Dust and compounds | NA | 1 | NA | NA |
| Manganese Fume | NA | 1 | NA | 3 |
| Manganese cyclopentadienyl tricarbonyl, as Mn | NA | 0.1 | NA | NA |
| Mercury, Alkyl compounds | NA | 0.01 | NA | 0.03 |
| Mercury, Aryl compounds | NA | 0.1 | NA | NA |
| Mercury, Inorganic forms including metallic mercury | NA | 0.025 | NA | NA |
| Mesityl oxide | 15 | 60 | 25 | 100 |
| Methacrylic acid | 20 | 70 | NA | NA |
| Methanol (Methyl alcohol) | 200 | 262 | 250 | 328 |
| Methomyl | NA | 2.5 | NA | NA |
| Methoxychlor | NA | 10 | NA | NA |
| 2-Methyoxyethanol (EGME) | 5 | 16 | NA | NA |
| 2-Methoxyethyl acetate (Ethylene glycol methyl ethyl acetate, EGMEA) | 5 | 24 | NA | NA |
| 4-Methoxyphenol | NA | 5 | NA | NA |
| Methyl acetate | 200 | 606 | 250 | 757 |
| Methyl acetylene (Propyne) | 1000 | 1640 | NA | NA |
| Methyl acetylene-propadiene mixture (MAPP) | 1000 | 1640 | 1250 | 2050 |
| Methyl acrylate | 10 | 35 | NA | NA |
| Methylacrylonitrile | 1 | 2.7 | NA | NA |
| Methylal (Dimethoxymethane) | 1000 | 3110 | NA | NA |
| Methylamine | 5 | 6.4 | 15 | 19 |
| Methyl n-amyl ketone (2-Heptanone) | 50 | 233 | NA | NA |
| N-Methyl aniline | 0.5 | 2.2 | NA | NA |
| Methyl bromide | 5 | 19 | NA | NA |
| Methyl-tert butyl ether | 40 | 144 | NA | NA |
| Methyl n-butyl ketone (2-Hexanone) | 5 | 20 | NA | NA |
| Methyl chloride | 50 | 103 | 100 | 207 |
| Methyl 2-cyanoacrylate | 2 | 9.1 | 4 | 18 |
| Methylcyclohexane | 400 | 1610 | NA | NA |
| Methylcyclohexanol | 50 | 234 | NA | NA |
| 0-Methylcyclohexanone | 50 | 229 | 75 | 344 |
| 2-Methylcyclopentadienyl manganese tricarbonyl, as Mn | NA | 0.2 | NA | NA |
| Methyl demeton | NA | 0.5 | NA | NA |
| Methylene bisphenyl isocyanate (MDI, Diphenyl methane diisocyanate) | 0.005 | 0.051 | NA | NA |
| Methylene chloride (Dichloromethane) | 50 | 174 | NA | NA |
| 4,4’-methylene bis (2-chloroaniline), [MOCA] | 0.01 | 0.11 | NA | NA |
| Methylene bis (4-cyclo-hexylisocyanate) | 0.005 | 0.054 | NA | NA |
| 4,4’-Methylene dianiline | 0.1 | 0.81 | NA | NA |
| Methyl ethyl ketone (MEK, 2-Butanone) | 200 | 590 | 300 | 885 |
| Methyl ethyl ketone peroxide | NA | NA | 0.2 | 1.5 |
| Methyl formate | 100 | 246 | 150 | 368 |
| Methyl hydrazine | NA | NA | 0.2 | 0.38 |
| Methyl iodide | 2 | 12 | NA | NA |
| Methyl isoamyl ketone | 50 | 234 | NA | NA |
| Methyl isobutyl carbinol (Methyl amyl alcohol) | 25 | 104 | 40 | 167 |
| Methyl isobutyl ketone (Hexone) | 50 | 205 | 75 | 307 |
| Methyl isocyanate | 0.02 | 0.047 | NA | NA |
| Methyl isopropyl ketone | 200 | 705 | NA | NA |
| Methyl mercaptan (Methanethiol) | 0.5 | 0.98 | NA | NA |
| Methyl methacrylate | 100 | 410 | NA | NA |
| Methyl parathion | NA | 0.2 | NA | NA |
| Methyl propyl ketone (2-Pentanone) | 200 | 705 | 250 | 881 |
| Methyl silicate | 1 | 6 | NA | NA |
| α;Methyl styrene | 50 | 242 | 100 | 483 |
| Metribuzin | NA | 5 | NA | NA |
| Mevinphos (Phosdrin) | 0.01 | 0.092 | 0.03 | 0.27 |
| Mica, respirable dust | NA | 3 | NA | NA |
| Mineral wool fiber | NA | 10 | NA | NA |
| Molybdenum, as Mo, Soluble compounds | NA | 5 | NA | NA |
| Molybdenum, as Mo, Insoluble compounds | NA | 10 | NA | NA |
| Monocrotophos | NA | 0.25 | NA | NA |
| Morpholine | 20 | 71 | NA | NA |
| Naled (Dimethyl-1,2-dibromo-2,2 dichloroethyl phosphate) | NA | 3 | NA | NA |
| Naphtha | 300 | 1370 | NA | NA |
| Naphthalene | 10 | 52 | 15 | 79 |
| Nickel, Metal | NA | 1 | NA | NA |
| Nickel, Insoluble compounds, as Ni | NA | 1 | NA | NA |
| Nickel, Soluble compounds, as Ni | NA | 0.1 | NA | NA |
| Nickel carbonyl, as Ni | 0.05 | 0.12 | NA | NA |
| Nickel sulfide, as Ni | NA | 1 | NA | NA |
| Nicotine | NA | 0.5 | NA | NA |
| Nitrapyrin (2-Chloro-6-(trichloromethyl) pyridine) | NA | 10 | NA | 20 |
| Nitric acid | 2 | 5.2 | 4 | 10 |
| Nitric oxide | 25 | 31 | NA | NA |
| p-Nitroaniline | NA | 3 | NA | NA |
| Nitrobenzene | 1 | 5 | NA | NA |
| p-Nitrochlorobenzene | 0.1 | 0.64 | NA | NA |
| Nitroethane | 100 | 307 | NA | NA |
| Nitrogen dioxide | 3 | 5.6 | 5 | 9.4 |
| Nitrogen trifluoride | 10 | 29 | NA | NA |
| Nitroglycerin (NG) | 0.05 | 0.46 | NA | NA |
| Nitromethane | 20 | 50 | NA | NA |
| 1-Nitropropane | 25 | 91 | NA | NA |
| 2-Nitropropane | 10 | 36 | NA | NA |
| Nitrotoluene | 2 | 11 | NA | NA |
| Nitrous oxide | 50 | 90 | NA | NA |
| Nonane | 200 | 1050 | NA | NA |
| Nuisance particulates | NA | 10 | NA | NA |
| Octachloronaphthalene | NA | 0.1 | NA | 0.3 |
| Octane | 300 | 1400 | 375 | 1750 |
| Oil Mist, mineral | NA | 5 | NA | 10 |
| Osmium tetroxide, as Os | 0.0002 | 0.0016 | 0.0006 | 0.0047 |
| Oxalic acid | NA | 1 | NA | 2 |
| Oxygen difluoride | NA | NA | 0.05 | 0.11 |
| Ozone | NA | NA | 0.1 | 0.2 |
| Paraffin wax fume | NA | 2 | NA | NA |
| Paraquat, Total dust | NA | 0.5 | NA | NA |
| Paraquat, Respirable dust | NA | 0.1 | NA | NA |
| Parathion | NA | 0.1 | NA | NA |
| Pentaborane | 0.005 | 0.013 | 0.015 | 0.039 |
| Pentachloronaphthalene | NA | 0.5 | NA | NA |
| Pentachloronitrobenzene | NA | 0.5 | NA | NA |
| Pentachlorophenol | NA | 0.5 | NA | NA |
| Pentaerythritol | NA | 10 | NA | NA |
| Pentane | 600 | 1770 | 750 | 2210 |
| Perchloroethylene (Tetrachloroethylene) | 25 | 170 | 100 | 685 |
| Perchloromethyl mercaptan | 0.1 | 0.76 | NA | NA |
| Perchloryl fluoride | 3 | 13 | 6 | 25 |
| Perfluoroisobutylene | NA | NA | 0.01 | 0.082 |
| Perlite | NA | 10 | NA | NA |
| Phenol | 5 | 19 | NA | NA |
| Phenothiazine | NA | 5 | NA | NA |
| Phenylenediamine | NA | 0.1 | NA | NA |
| Phenyl ether | 1 | 7 | 2 | 14 |
| Phenyl glycidyl ether (PGE) | 0.1 | 0.6 | NA | NA |
| Phenylhydrazine | 0.1 | 0.44 | NA | NA |
| Phenyl mercaptan | 0.5 | 2.3 | NA | NA |
| Phenylphosphine | NA | NA | 0.05 | 0.23 |
| Phorate | NA | 0.05 | NA | 0.2 |
| Phosgene | 0.1 | 0.4 | NA | NA |
| Phosphine | 0.3 | 0.42 | 1 | 1.4 |
| Phosphoric acid | NA | 1 | NA | 3 |
| Phosphorus | 0.02 | 0.1 | NA | NA |
| Phosphorus oxychloride | 0.1 | 0.63 | NA | NA |
| Phosphorus pentachloride | 0.1 | 0.85 | NA | NA |
| Phosphorus pentasulfide | NA | 1 | NA | 3 |
| Phosphorus trichloride | 0.2 | 1.1 | 0.5 | 2.8 |
| Phthalic anhydride | 1 | 6.1 | NA | NA |
| m-Phthalodinitrile | NA | 5 | NA | NA |
| Picloram | NA | 10 | NA | NA |
| Picric acid (2,4,6-Trinitrophenol) | NA | 0.1 | NA | NA |
| Pindone (2-Pivalyl-1,3-indandione) | NA | 0.1 | NA | NA |
| Piperazine dihydrochloride | NA | 5 | NA | NA |
| Platinum, Metal | NA | 1 | NA | NA |
| Platinum, Soluble salts, as Pt | NA | 0.002 | NA | NA |
| Portland cement | NA | 10 | NA | NA |
| Potassium cyanide | NA | NA | NA | 5 |
| Potassium hydroxide | NA | NA | NA | 2 |
| Propargyl alcohol | 1 | 2.3 | NA | NA |
| β-Propiolactone | 0.5 | 1.5 | NA | NA |
| Propionic acid | 10 | 30 | NA | NA |
| Propoxur | NA | 0.5 | NA | NA |
| n-Propyl acetate | 200 | 835 | 250 | 1040 |
| n-Propyl alcohol | 200 | 492 | 250 | 614 |
| Propylene dichloride, (1,2-Dichloropropane) | 75 | 347 | 110 | 508 |
| Propylene glycol dinitrate | 0.05 | 0.34 | NA | NA |
| Propylene glycol monomethyl ether | 100 | 369 | 150 | 553 |
| Propylene imine | 2 | 4.7 | NA | NA |
| Propylene oxide (1,2-Epoxypropane) | 20 | 48 | NA | NA |
| n-Propyl nitrate | 25 | 107 | 40 | 172 |
| Pyrethrum | NA | 5 | NA | NA |
| Pyridine | 5 | 16 | NA | NA |
| Quinone | 0.1 | 0.44 | NA | NA |
| Resorcinol | 10 | 45 | 20 | 90 |
| Rhodium, Metal | NA | 1 | NA | NA |
| Rhodium, Insoluble compounds, as Rh | NA | 1 | NA | NA |
| Rhodium, Soluble compounds, as Rh | NA | 0.01 | NA | NA |
| Ronnel | NA | 10 | NA | NA |
| Rotenone | NA | 5 | NA | NA |
| Rouge | NA | 10 | NA | NA |
| Selenium and compounds, as Se | NA | 0.2 | NA | NA |
| Selenium hexafluoride | 0.05 | 0.16 | NA | NA |
| Sesone | NA | 10 | NA | NA |
| Silica-Amorphous, Diatomaceous earth (uncalcined) | NA | 10 | NA | NA |
| Silica-Amorphous, Precipitated silica | NA | 10 | NA | NA |
| Silica, fume, respirable dust | NA | 2 | NA | NA |
| Silica, fused, respirable dust | NA | 0.1 | NA | NA |
| Silica gel | NA | 10 | NA | NA |
| Silica-Crystalline, Cristobalite, respirable dust | NA | 0.05 | NA | NA |
| Silica-Crystalline, Quartz, respirable dust | NA | 0.1 | NA | NA |
| Silica-Crystalline, Tridymite, respirable dust | NA | 0.05 | NA | NA |
| Silica-Crystalline, Tripoli, respirable dust | NA | 0.1 | NA | NA |
| Silicon | NA | 10 | NA | NA |
| Silicon carbide | NA | 10 | NA | NA |
| Silicon tetrahydride | 5 | 6.6 | NA | NA |
| Silver, Metal | NA | 0.1 | NA | NA |
| Silver, Soluble compounds, as Ag | NA | 0.01 | NA | NA |
| Soapstone, Respirable dust | NA | 3 | NA | NA |
| Soapstone, Total dust | NA | 6 | NA | NA |
| Sodium azide as Hydrazoic acid | NA | NA | NA | 0.29 |
| vapour | NA | NA | 0.11 | NA |
| Sodium bisulfite | NA | 5 | NA | NA |
| Sodium cyanide | NA | NA | NA | 5 |
| Sodium fluoroacetate | NA | 0.05 | NA | NA |
| Sodium hydroxide | NA | NA | NA | 2 |
| Sodium metabisulfite | NA | 5 | NA | NA |
| Starch | NA | 10 | NA | NA |
| Stearates | NA | 10 | NA | NA |
| Stibine | 0.1 | 0.51 | NA | NA |
| Stoddard solvent | 100 | 525 | NA | NA |
| Strontium chromate | NA | 0.0005 | NA | NA |
| Strychnine | NA | 0.15 | NA | NA |
| Styrene, monomer (Phenylethylene, vinyl benzene) | 50 | 213 | 100 | 426 |
| Subtilisins | NA | NA | NA | 6.0E-5 |
| Sucrose | NA | 10 | NA | NA |
| Sulfometuron methyl | NA | 5 | NA | NA |
| Sulfotep | NA | 0.2 | NA | NA |
| Sulfur dioxide | 2 | 5.2 | 5 | 13 |
| Sulfur hexafluoride | 1000 | 5970 | NA | NA |
| Sulfuric acid | NA | 1 | NA | 3 |
| Sulfur monochloride | NA | NA | 1 | 5.5 |
| Sulfur pentafluoride | NA | NA | 0.01 | 0.1 |
| Sulfur tetrafluoride | NA | NA | 0.1 | 0.44 |
| Sulfuryl fluoride | 5 | 21 | 10 | 42 |
| Sulprofos | NA | 1 | NA | NA |
| Talc | NA | 2 | NA | NA |
| Tantalum, metal and oxide, as Ta | NA | 5 | NA | NA |
| Tellurium and compounds, as Te | NA | 0.1 | NA | NA |
| Tellurium hexafluoride | 0.02 | 0.1 | NA | NA |
| Temephos | NA | 10 | NA | NA |
| Terephthalic acid | NA | 10 | NA | NA |
| TEPP | 0.004 | 0.047 | NA | NA |
| Terphenyls | NA | NA | 0.53 | 5 |
| 1,1,1,2-Tetrachloro-2,2-difluoroethane | 500 | 4170 | NA | NA |
| 1,1,2,2-Tetrachloro-1,2-difluoroethane | 500 | 4170 | NA | NA |
| 1,1,2,2-Tetrachloroethane | 1 | 6.9 | NA | NA |
| Tetrachloronaphthalene | NA | 2 | NA | NA |
| Tetraethyl lead, as Pb | NA | 0.1 | NA | NA |
| Tetrahydrofuran | 200 | 590 | 250 | 737 |
| Tetramethyl lead, as Pb | NA | 0.15 | NA | NA |
| Tetramethyl succinonitrile | 0.5 | 2.8 | NA | NA |
| Tetranitromethane | 0.005 | 0.04 | NA | NA |
| Tetrasodium pyrophosphate | NA | 5 | NA | NA |
| Tetryl (2,4,6-Trinitrophenyl methylnitramine) | NA | 1.5 | NA | NA |
| Thallium, elemental and soluble compounds, as Ti | NA | 0.1 | NA | NA |
| 4,4’-Thiobis (6-tert-butyl-m-cresol) | NA | 10 | NA | NA |
| Thioglycolic acid | 1 | 3.8 | NA | NA |
| Thioyl chloride | NA | NA | 1 | 4.9 |
| Thiram | NA | 1 | NA | NA |
| Tin, Metal | NA | 2 | NA | NA |
| Tin, Oxide inorganic compounds, as Sn | NA | 2 | NA | NA |
| Tin, Organic compounds, as Sn | NA | 0.1 | NA | 0.2 |
| Titanium dioxide | NA | 10 | NA | NA |
| Toluene (Toluol) | 50 | 188 | NA | NA |
| Toluene-2,4-diisocyanate (TDI) | 0.005 | 0.036 | 0.02 | 0.14 |
| Toluidine | 2 | 8.8 | NA | NA |
| Tributyl phosphate | 0.2 | 2.2 | NA | NA |
| Trichloroacetic acid | 1 | 6.7 | NA | NA |
| 1,2,4-Trichlorobenzene | NA | NA | 5 | 37 |
| 1,1,1-Trichloroethane (Methyl chloroform) | 350 | 1910 | 450 | 2460 |
| 1,1,2-Trichloroethane | 10 | 55 | NA | NA |
| Trichloroethylene | 50 | 269 | 100 | 537 |
| Trichlorofluoromethane | NA | NA | 1000 | 5620 |
| Trichloronaphthalene | NA | 5 | NA | NA |
| 1,2,3-Trichloropropane | 10 | 60 | NA | NA |
| 1,1,2-Trichloro-1,2,2-trifluoroethane | 1000 | 7670 | 1250 | 9590 |
| Triethanolamine | NA | 5 | NA | NA |
| Triethylamine | 1 | 4.1 | 5 | 20.7 |
| Trifluorobromomethane | 1000 | 6090 | NA | NA |
| Trimellitic anhydride | NA | NA | NA | 0.04 |
| Trimethylamine | 5 | 12 | 15 | 36 |
| Trimethyl benzene | 25 | 123 | NA | NA |
| Trimethyl phosphite | 2 | 10 | NA | NA |
| 2,4,6-Trinitrotoluene (TNT) | NA | 0.5 | NA | NA |
| Triorthocresyl phosphate | NA | 0.1 | NA | NA |
| Triphenyl amine | NA | 5 | NA | NA |
| Triphenyl phosphate | NA | 3 | NA | NA |
| Tungsten, as W, Insoluble compounds | NA | 5 | NA | 10 |
| Tungsten, as W, Soluble compounds | NA | 1 | NA | 3 |
| Turpentine | 100 | 566 | NA | NA |
| Uranium, Soluble & Insoluble compounds, as U | NA | 0.2 | NA | 0.6 |
| n-Valeraldehyde | 50 | 176 | NA | NA |
| Vanadium pentoxide Respirable dust or fume | NA | 0.05 | NA | NA |
| Vegetable oil mists | NA | 10 | NA | NA |
| Vinyl acetate | 10 | 35 | 15 | 53 |
| Vinyl bromide | 5 | 22 | NA | NA |
| Vinyl chloride (Chloroethylene) | 5 | 13 | NA | NA |
| 4-Vinyl cyclohexene | 0.1 | 0.4 | NA | NA |
| Vinyl cyclohexene dioxide | 10 | 57 | NA | NA |
| Vinylidene chloride (1,1-Dichloroethylene) | 5 | 20 | 20 | 79 |
| Vinyl toluene | 50 | 242 | 100 | 483 |
| Warfarin | NA | 0.1 | NA | NA |
| Welding fumes | NA | 5 | NA | NA |
| Wood dust, Hard wood | NA | 1 | NA | NA |
| Wood dust, Soft wood | NA | 5 | NA | 10 |
| Xylene | 100 | 434 | 150 | 651 |
| m-Xylene α;, α;1-diamine | NA | NA | NA | 0.1 |
| Xylidine (dimethylaminobenzene) | 0.5 | 2.5 | NA | NA |
| Yttrium metal and compounds, as Y | NA | 1 | NA | NA |
| Zinc chloride fume | NA | 1 | NA | 2 |
| Zinc chromates, as Cr | NA | 0.01 | NA | NA |
| Zinc oxide, Fume | NA | 5 | NA | 10 |
| Zinc oxide, Dust | NA | 10 | NA | NA |
| Zirconium and compounds, as Zr | NA | 5 | NA | 10 |