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Valores de concentracion IDLH ( Immediately Dangerous to Life or Health). Lista revisada de valores de la NIOSH.

Posted by Firestation en 10/01/2012

Substance Original IDLH
Value
Revised IDLH
Value
Acetaldehyde 10,000 ppm 2,000 ppm
Acetic acid 1,000 ppm 50 ppm
Acetic anhydride 1,000 ppm 200 ppm
Acetone 20,000 ppm 2,500 ppm [LEL]
Acetonitrile 4,000 ppm 500 ppm
Acetylene tetrabromide 10 ppm 8 ppm
Acrolein 5 ppm 2 ppm
Acrylamide Unknown 60 mg/m3
Acrylonitrile 500 ppm 85 ppm
Aldrin 100 mg/m3 25 mg/m3
Allyl alcohol 150 ppm 20 ppm
Allyl chloride 300 ppm 250 ppm
Allyl glycidyl ether 270 ppm 50 ppm
2 Aminopyridine 5 ppm 5 ppm [Unch]
Ammonia 500 ppm 300 ppm
Ammonium sulfamate 5,000 mg/m3 1,500 mg/m3
n-Amyl acetate 4,000 ppm 1,000 ppm
sec-Amyl acetate 9,000 ppm 1,000 ppm
Aniline 100 ppm 100 ppm [Unch]
o-Anisidine 50 mg/m3 50 mg/m3 [Unch]
p-Anisidine 50 mg/m3 50 mg/m3 [Unch]
Antimony compounds (as Sb) 80 mg Sb/m3 50 mg Sb/m3
ANTU 100 mg/m3 100 mg/m3 [Unch]
Arsenic (inorganic compounds, as As) 100 mg As/m3 5 mg As/m3
Arsine 6 ppm 3 ppm
Azinphosmethyl 20 mg/m3 10 mg/m3
Barium (soluble compounds, as Ba) 1,100 mg Ba/m3 50 mg Ba/m3
Benzene 3,000 ppm 500 ppm
Benzoyl peroxide 7,000 mg/m3 1,500 mg/m3
Benzyl chloride 10 ppm 10 ppm [Unch]
Beryllium compounds (as Be) 10 mg Be/m3 4 mg Be/m3
Boron oxide N.E. 2,000 mg/m3
Boron trifluoride 100 ppm 25 ppm
Bromine 10 ppm 3 ppm
Bromoform Unknown 850 ppm
1,3-Butadiene 20,000 ppm [LEL] 2,000 ppm [LEL]
2-Butanone 3,000 ppm 3,000 ppm [Unch]
2-Butoxyethanol 700 ppm 700 ppm [Unch]
n-Butyl acetate 10,000 ppm 1,700 ppm [LEL]
sec-Butyl acetate 10,000 ppm 1,700 ppm [LEL]
tert-Butyl acetate 10,000 ppm 1,500 ppm [LEL]
n-Butyl alcohol 8,000 ppm 1,400 ppm [LEL]
sec-Butyl alcohol 10,000 ppm 2,000 ppm
tert-Butyl alcohol 8,000 ppm 1,600 ppm
n-Butylamine 2,000 ppm 300 ppm
tert-Butyl chromate 30 mg/m3 (as CrO3) 15 mg Cr(VI)/m3
n-Butyl glycidyl ether 3,500 ppm 250 ppm
n-Butyl mercaptan 2,500 ppm 500 ppm
p-tert-Butyltoluene 1,000 ppm 100 ppm
Cadmium dust (as Cd) 50 mg Cd/m3 9 mg Cd/m3
Cadmium fume (as Cd) 9 mg Cd/m3 9 mg Cd/m3[Unc h]
Calcium arsenate (as As) 100 mg As/m3 5 mg As/m3
Calcium oxide Unknown 25 mg/m3
Camphor (synthetic) 200 mg/m3 200 mg/m3 [Unch]
Carbaryl 600 mg/m3 100 mg/m3
Carbon black N.E. 1,750 mg/m3
Carbon dioxide 50,000 ppm 40,000 ppm
Carbon disulfide 500 ppm 500 ppm [Unch]
Carbon monoxide 1,500 ppm 1,200 ppm
Carbon tetrachloride 300 ppm 200 ppm
Chlordane 500 mg/m3 100 mg/m3
Chlorinated camphene 200 mg/m3 200 mg/m3 [Unch]
Chlorinated diphenyl oxide Unknown 5 mg/m3
Chlorine 30 ppm 10 ppm
Chlorine dioxide 10 ppm 5 ppm
Chlorine trifluoride 20 ppm 20 ppm [Unch]
Chloroacetaldehyde 100 ppm 45 ppm
alpha-Chloroacetophenone 100 mg/m3 15 mg/m3
Chlorobenzene 2,400 ppm 1,000 ppm
o-Chlorobenzylidene malononitrile 2 mg/m3 2 mg/m3 [Unch]
Chlorobromomethane 5,000 ppm 2,000 ppm
Chlorodiphenyl (42% chlorine) 10 mg/m3 5 mg/m3
Chlorodiphenyl (54% chlorine) 5 mg/m3 5 mg/m3 [Unch]
Chloroform 1,000 ppm 500 ppm
1-Chloro-1-nitropropane 2,000 ppm 100 ppm
Chloropicrin 4 ppm 2 ppm
beta-Chloroprene 400 ppm 300 ppm
Chromic acid and chromates 30 mg/m3 (as CrO3) 15 mg Cr(VI)/m3
Chromium (II) compounds [as Cr(II)] N.E. 250 mg Cr(II)/m3
Chromium (III) compounds [as Cr(III)] N.E. 25 mg Cr(III)/m3
Chromium metal (as Cr) N.E. 250 mg Cr/m3
Coal tar pitch volatiles 700 mg/m3 80 mg/m3
Cobalt metal, dust and fume (as Co) 20 mg Co/m3 20 mg Co/m3 [Unch]
Copper (dusts and mists, as Cu) N.E. 100 mg Cu/m3
Copper fume (as Cu) N.E. 100 mg Cu/m3
Cotton dust (raw) N.E. 100 mg/m3
Crag (r) herbicide 5,000 mg/m3 500 mg/m3
Cresol (o, m, p isomers) 250 ppm 250 ppm [Unch]
Crotonaldehyde 400 ppm 50 ppm
Cumene 8,000 ppm 900 ppm [LEL]
Cyanides (as CN) 50 mg/m3 (as CN) 25 mg/m3 (as CN)
Cyclohexane 10,000 ppm 1,300 ppm [LEL]
Cyclohexanol 3,500 ppm 400 ppm
Cyclohexanone 5,000 ppm 700 ppm
Cyclohexene 10,000 ppm 2,000 ppm
Cyclopentadiene 2,000 ppm 750 ppm
2,4-D 500 mg/m3 100 mg/m3
DDT N.E. 500 mg/m3
Decaborane 100 mg/m3 15 mg/m3
Demeton 20 mg/m3 10 mg/m3
Diacetone alcohol 2,100 ppm 1,800 ppm [LEL]
Diazomethane 2 ppm 2 ppm [Unch]
Diborane 40 ppm 15 ppm
Dibutyl phosphate 125 ppm 30 ppm
Dibutyl phthalate 9,300 mg/m3 4,000 mg/m3
o-Dichlorobenzene 1,000 ppm 200 ppm
p-Dichlorobenzene 1,000 ppm 150 ppm
Dichlorodifluoromethane 50,000 ppm 15,000 ppm
1,3-Dichloro 5,5-dimethylhydantoin Unknown 5 mg/m3
1,1-Dichloroethane 4,000 ppm 3,000 ppm
1,2-Dichloroethylene 4,000 ppm 1,000 ppm
Dichloroethyl ether 250 ppm 100 ppm
Dichloromonofluoromethane 50,000 ppm 5,000 ppm
1,1-Dichloro 1-nitroethane 150 ppm 25 ppm
Dichlorotetrafluoroethane 50,000 ppm 15,000 ppm
Dichlorvos 200 mg/m3 100 mg/m3
Dieldrin 450 mg/m3 50 mg/m3
Diethylamine 2,000 ppm 200 ppm
2-Diethylaminoethanol 500 ppm 100 ppm
Difluorodibromomethane 2,500 ppm 2,000 ppm
Diglycidyl ether 25 ppm 10 ppm
Diisobutyl ketone 2,000 ppm 500 ppm
Diisopropylamine 1,000 ppm 200 ppm
Dimethyl acetamide 400 ppm 300 ppm
Dimethylamine 2,000 ppm 500 ppm
N,N-Dimethylaniline 100 ppm 100 ppm [Unch]
Dimethyl 1,2-dibromo 2,2-dichlorethyl phosphate 1,800 mg/m3 200 mg/m3
Dimethylformamide 3,500 ppm 500 ppm
1,1-Dimethylhydrazine 50 ppm 15 ppm
Dimethylphthalate 9,300 mg/m3 2,000 mg/m3
Dimethyl sulfate 10 ppm 7 ppm
Dinitrobenzene (o, m, p isomers) 200 mg/m3 50 mg/m3
Dinitroocresol 5 mg/m3 5 mg/m3 [Unch]
Dinitrotoluene 200 mg/m3 50 mg/m3
Di sec-octyl phthalate Unknown 5,000 mg/m3
Dioxane 2,000 ppm 500 ppm
Diphenyl 300 mg/m3 100 mg/m3
Dipropylene glycol methyl ether Unknown 600 ppm
Endrin 2,000 mg/m3 2 mg/m3
Epichlorohydrin 250 ppm 75 ppm
EPN 50 mg/m3 5 mg/m3
Ethanolamine 1,000 ppm 30 ppm
2-Ethoxyethanol 6,000 ppm 500 ppm
2-Ethoxyethyl acetate 2,500 ppm 500 ppm
Ethyl acetate 10,000 ppm 2,000 ppm [LEL]
Ethyl acrylate 2,000 ppm 300 ppm
Ethyl alcohol 15,000 ppm 3,300 ppm [LEL]
Ethylamine 4,000 ppm 600 ppm
Ethyl benzene 2,000 ppm 800 ppm [LEL]
Ethyl bromide 3,500 ppm 2,000 ppm
Ethyl butyl ketone 3,000 ppm 1,000 ppm
Ethyl chloride 20,000 ppm 3,800 ppm [LEL]
Ethylene chlorohydrin 10 ppm 7 ppm
Ethylenediamine 2,000 ppm 1,000 ppm
Ethylene dibromide 400 ppm 100 ppm
Ethylene dichloride 1,000 ppm 50 ppm
Ethylene glycol dinitrate 500 mg/m3 75 mg/m3
Ethyleneimine 100 ppm 100 ppm [Unch]
Ethylene oxide 800 ppm 800 ppm [Unch]
Ethyl ether 19,000 ppm [LEL] 1,900 ppm [LEL]
Ethyl formate 8,000 ppm 1,500 ppm
Ethyl mercaptan 2,500 ppm 500 ppm
N-Ethylmorpholine 2,000 ppm 100 ppm
Ethyl silicate 1,000 ppm 700 ppm
Ferbam N.E. 800 mg/m3
Ferrovanadium dust N.E. 500 mg/m3
Fluorides (as F) 500 mg F/m3 250 mg F/m3
Fluorine 25 ppm 25 ppm [Unch]
Fluorotrichloromethane 10,000 ppm 2,000 ppm
Formaldehyde 30 ppm 20 ppm
Formic acid 30 ppm 30 ppm [Unch]
Furfural 250 ppm 100 ppm
Furfuryl alcohol 250 ppm 75 ppm
Glycidol 500 ppm 150 ppm
Graphite (natural) N.E. 1,250 mg/m3
Hafnium compounds (as Hf) Unknown 50 mg Hf/m3
Heptachlor 700 mg/m3 35 mg/m3
n-Heptane 5,000 ppm 750 ppm
Hexachloroethane 300 ppm 300 ppm [Unch]
Hexachloronaphthalene 2 mg/m3 2 mg/m3 [Unch]
n-Hexane 5,000 ppm 1,100 ppm [LEL]
2-Hexanone 5,000 ppm 1,600 ppm
Hexone 3,000 ppm 500 ppm
sec Hexyl acetate 4,000 ppm 500 ppm
Hydrazine 80 ppm 50 ppm
Hydrogen bromide 50 ppm 30 ppm
Hydrogen chloride 100 ppm 50 ppm
Hydrogen cyanide 50 ppm 50 ppm [Unch]
Hydrogen fluoride (as F) 30 ppm 30 ppm [Unch]
Hydrogen peroxide 75 ppm 75 ppm [Unch]
Hydrogen selenide (as Se) 2 ppm 1 ppm
Hydrogen sulfide 300 ppm 100 ppm
Hydroquinone Unknown 50 mg/m3
Iodine 10 ppm 2 ppm
Iron oxide dust and fume (as Fe) N.E. 2,500 mg Fe/m3
Isoamyl acetate 3,000 ppm 1,000 ppm
Isoamyl alcohol (primary and secondary) 10,000 ppm 500 ppm
Isobutyl acetate 7,500 ppm 1,300 ppm [LEL]
Isobutyl alcohol 8,000 ppm 1,600 ppm
Isophorone 800 ppm 200 ppm
Isopropyl acetate 16,000 ppm 1,800 ppm
Isopropyl alcohol 12,000 ppm 2,000 ppm [LEL]
Isopropylamine 4,000 ppm 750 ppm
Isopropyl ether 10,000 ppm 1,400 ppm [LEL]
Isopropyl glycidyl ether 1,000 ppm 400 ppm
Ketene Unknown 5 ppm
Lead compounds (as Pb) 700 mg Pb/m3 100 mg Pb/m3
Lindane 1,000 mg/m3 50 mg/m3
Lithium hydride 55 mg/m3 0.5 mg/m3
L.P.G. 19,000 ppm [LEL] 2,000 ppm [LEL]
Magnesium oxide fume N.E. 750 mg/m3
Malathion 5,000 mg/m3 250 mg/m3
Maleic anhydride Unknown 10 mg/m3
Manganese compounds (as Mn) N.E. 500 mg Mn/m3
Mercury compounds [except (organo) alkyls, as Hg] 28 mg Hg/m3 10 mg Hg/m3
Mercury (organo) alkyl compounds(as Hg) 10 mg Hg/m3 2 mg Hg/m3
Mesityl oxide 5,000 ppm 1,400 ppm [LEL]
Methoxychlor N.E. 5,000 mg/m3
Methyl acetate 10,000 ppm 3,100 ppm [LEL]
Methyl acetylene 15,000 ppm [LEL] 1,700 ppm [LEL]
Methyl acetylenepropadiene mixture 15,000 ppm 3,400 ppm [LEL]
Methyl acrylate 1,000 ppm 250 ppm
Methylal 15,000 ppm [LEL] 2,200 ppm [LEL]
Methyl alcohol 25,000 ppm 6,000 ppm
Methylamine 100 ppm 100 ppm [Unch]
Methyl (namyl) ketone 4,000 ppm 800 ppm
Methyl bromide 2,000 ppm 250 ppm
Methyl Cellosolve (r) 2,000 ppm 200 ppm
Methyl Cellosolve (r) acetate 4,000 ppm 200 ppm
Methyl chloride 10,000 ppm 2,000 ppm
Methyl chloroform 1,000 ppm 700 ppm
Methylcyclohexane 10,000 ppm 1,200 ppm [LEL]
Methylcyclohexanol 10,000 ppm 500 ppm
o-Methylcyclohexanone 2,500 ppm 600 ppm
Methylene bisphenyl isocyanate 100 mg/m3 75 mg/m3
Methylene chloride 5,000 ppm 2,300 ppm
Methyl formate 5,000 ppm 4,500 ppm
5-Methyl 3-heptanone 3,000 ppm 100 ppm
Methyl hydrazine 50 ppm 20 ppm
Methyl iodide 800 ppm 100 ppm
Methyl isobutyl carbinol 2,000 ppm 400 ppm
Methyl isocyanate 20 ppm 3 ppm
Methyl mercaptan 400 ppm 150 ppm
Methyl methacrylate 4,000 ppm 1,000 ppm
Methyl styrene 5,000 ppm 700 ppm
Mica N.E. 1,500 mg/m3
Molybdenum (insoluble compounds, as Mo) N.E. 5,000 mg Mo/m3
Molybdenum (soluble compounds, as Mo) N.E. 1,000 mg Mo/m3
Monomethyl aniline 100 ppm 100 ppm [Unch]
Morpholine 8,000 ppm 1,400 ppm [LEL]
Naphtha (coal tar) 10,000 ppm [LEL] 1,000 ppm [LEL]
Naphthalene 500 ppm 250 ppm
Nickel carbonyl (as Ni) 7 ppm 2 ppm
Nickel metal and other compounds (as Ni) N.E. 10 mg Ni/m3
Nicotine 35 mg/m3 5 mg/m3
Nitric acid 100 ppm 25 ppm
Nitric oxide 100 ppm 100 ppm [Unch]
p-Nitroaniline 300 mg/m3 300 mg/m3 [Unch]
Nitrobenzene 200 ppm 200 ppm [Unch]
p-Nitrochlorobenzene 1,000 mg/m3 100 mg/m3
Nitroethane 1,000 ppm 1,000 ppm [Unch]
Nitrogen dioxide 50 ppm 20 ppm
Nitrogen trifluoride 2,000 ppm 1,000 ppm
Nitroglycerine 500 mg/m3 75 mg/m3
Nitromethane 1,000 ppm 750 ppm
1-Nitropropane 2,300 ppm 1,000 ppm
2-Nitropropane 2,300 ppm 100 ppm
Nitrotoluene (o, m, p isomers) 200 ppm 200 ppm [Unch]
Octachloronaphthalene Unknown Unknown [Unch]
Octane 5,000 ppm 1,000 ppm [LEL]
Oil mist (mineral) N.E. 2,500 mg/m3
Osmium tetroxide (as Os) 1 mg Os/m3 1 mg Os/m3 [Unch]
Oxalic acid 500 mg/m3 500 mg/m3 [Unch]
Oxygen difluoride 0.5 ppm 0.5 ppm [Unch]
Ozone 10 ppm 5 ppm
Paraquat 1.5 mg/m3 1 mg/m3
Parathion 20 mg/m3 10 mg/m3
Pentaborane 3 ppm 1 ppm
Pentachloronaphthalene Unknown Unknown [Unch]
Pentachlorophenol 150 mg/m3 2.5 mg/m3
n-Pentane 15,000 ppm [LEL] 1,500 ppm [LEL]
2-Pentanone 5,000 ppm 1,500 ppm
Perchloromethyl mercaptan 10 ppm 10 ppm [Unch]
Perchloryl fluoride 385 ppm 100 ppm
Petroleum distillates (naphtha) 10,000 ppm 1,100 ppm [LEL]
Phenol 250 ppm 250 ppm [Unch]
p-Phenylene diamine Unknown 25 mg/m3
Phenyl ether (vapor) N.E. 100 ppm
Phenyl etherbiphenyl mixture (vapor) N.E. 10 ppm
Phenyl glycidyl ether Unknown 100 ppm
Phenylhydrazine 295 ppm 15 ppm
Phosdrin 4 ppm 4 ppm [Unch]
Phosgene 2 ppm 2 ppm [Unch]
Phosphine 200 ppm 50 ppm
Phosphoric acid 10,000 mg/m3 1,000 mg/m3
Phosphorus (yellow) N.E. 5 mg/m3
Phosphorus pentachloride 200 mg/m3 70 mg/m3
Phosphorus pentasulfide 750 mg/m3 250 mg/m3
Phosphorus trichloride 50 ppm 25 ppm
Phthalic anhydride 10,000 mg/m3 60 mg/m3
Picric acid 100 mg/m3 75 mg/m3
Pindone 200 mg/m3 100 mg/m3
Platinum (soluble salts, as Pt) N.E. 4 mg Pt/m3
Portland cement N.E. 5,000 mg/m3
Propane 20,000 ppm [LEL] 2,100 ppm [LEL]
n-Propyl acetate 8,000 ppm 1,700 ppm
n-Propyl alcohol 4,000 ppm 800 ppm
Propylene dichloride 2,000 ppm 400 ppm
Propylene imine 500 ppm 100 ppm
Propylene oxide 2,000 ppm 400 ppm
n-Propyl nitrate 2,000 ppm 500 ppm
Pyrethrum 5,000 mg/m3 5,000 mg/m3 [Unch]
Pyridine 3,600 ppm 1,000 ppm
Quinone 300 mg/m3 100 mg/m3
Rhodium (metal fume and insoluble compounds, as Rh) N.E. 100 mg Rh/m3
Rhodium (soluble compounds, as Rh) N.E. 2 mg Rh/m3
Ronnel 5,000 mg/m3 300 mg/m3
Rotenone Unknown 2,500 mg/m3
Selenium compounds (as Se) Unknown 1 mg Se/m3
Selenium hexafluoride 5 ppm 2 ppm
Silica, amorphous N.E. 3,000 mg/m3
Silica, crystalline (respirable dust) N.E.

cristobalite/tridymite:

25 mg/m3

quartz/tripoli:

50 mg/m3
Silver (metal dust and soluble compounds, as Ag) N.E. 10 mg Ag/m3
Soapstone N.E. 3,000 mg/m3
Sodium fluoroacetate 5 mg/m3 2.5 mg/m3
Sodium hydroxide 250 mg/m3 10 mg/m3
Stibine 40 ppm 5 ppm
Stoddard solvent 29,500 mg/m3 20,000 mg/m3
Strychnine 3 mg/m3 3 mg/m3 [Unch]
Styrene 5,000 ppm 700 ppm
Sulfur dioxide 100 ppm 100 ppm [Unch]
Sulfuric acid 80 mg/m3 15 mg/m3
Sulfur monochloride 10 ppm 5 ppm
Sulfur pentafluoride 1 ppm 1 ppm [Unch]
Sulfuryl fluoride 1,000 ppm 200 ppm
2,4,5-T Unknown 250 mg/m3
Talc N.E. 1,000 mg/m3
Tantalum (metal and oxide dust, as Ta) N.E. 2,500 mg Ta/m3
TEDP 35 mg/m3 10 mg/m3
Tellurium compounds (as Te) N.E. 25 mg Te/m3
Tellurium hexafluoride 1 ppm 1 ppm [Unch]
TEPP 10 mg/m3 5 mg/m3
Terphenyl (o, m, p isomers) Unknown 500 mg/m3
1,1,1,2-Tetrachloro 2,2-difluoroethane 15,000 ppm 2,000 ppm
1,1,2,2-Tetrachloro 1,2-difluoroethane 15,000 ppm 2,000 ppm
1,1,2,2-Tetrachloroethane 150 ppm 100 ppm
Tetrachloroethylene 500 ppm 150 ppm
Tetrachloronaphthalene Unknown Unknown [Unch]
Tetraethyl lead (as Pb) 40 mg Pb/m3 40 mg Pb/m3 [Unch]
Tetrahydrofuran 20,000 ppm [LEL] 2,000 ppm [LEL]
Tetramethyl lead (as Pb) 40 mg Pb/m3 40 mg Pb/m3 [Unch]
Tetramethyl succinonitrile 5 ppm 5 ppm [Unch]
Tetranitromethane 5 ppm 4 ppm
Tetryl N.E. 750 mg/m3
Thallium (soluble compounds, as Tl) 20 mg Tl/m3 15 mg Tl/m3
Thiram 1,500 mg/m3 100 mg/m3
Tin (inorganic compounds, as Sn) 400 mg Sn/m3 100 mg Sn/m3
Tin (organic compounds, as Sn) Unknown 25 mg Sn/m3
Titanium dioxide N.E. 5,000 mg/m3
Toluene 2,000 ppm 500 ppm
Toluene 2,4-diisocyanate 10 ppm 2.5 ppm
o-Toluidine 100 ppm 50 ppm
Tributyl phosphate 125 ppm 30 ppm
1,1,2-Trichloroethane 500 ppm 100 ppm
Trichloroethylene 1,000 ppm 1,000 ppm [Unch]
Trichloronaphthalene Unknown Unknown [Unch]
1,2,3-Trichloropropane 1,000 ppm 100 ppm
1,1,2-Trichloro 1,2,2-trifluoroethane 4,500 ppm 2,000 ppm
Triethylamine 1,000 ppm 200 ppm
Trifluorobromomethane 50,000 ppm 40,000 ppm
2,4,6-Trinitrotoluene 1,000 mg/m3 500 mg/m3
Triorthocresyl phosphate 40 mg/m3 40 mg/m3 [Unch]
Triphenyl phosphate N.E. 1,000 mg/m3
Turpentine 1,500 ppm 800 ppm
Uranium (insoluble compounds, as U) 30 mg U/m3 10 mg U/m3
Uranium (soluble compounds, as U) 20 mg U/m3 10 mg U/m3
Vanadium dust 70 mg/m3 (as V2O5) 35 mg V/m3
Vanadium fume 70 mg/m3 (as V2O5) 35 mg V/m3
Vinyl toluene 5,000 ppm 400 ppm
Warfarin 350 mg/m3 100 mg/m3
Xylene (o, m, p isomers) 1,000 ppm 900 ppm
Xylidine 150 ppm 50 ppm
Yttrium compounds (as Y) N.E. 500 mg Y/m3
Zinc chloride fume 4,800 mg/m3 50 mg/m3
Zinc oxide 2,500 mg/m3 500 mg/m3
Zirconium compounds (as Zr) 500 mg Zr/m3 25 mg Zr/m3

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