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.

25 mg/m³

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

50 mg Zr/m³