Workplace Safety and Health (General Provisions) Regulations

FIRST SCHEDULE

Regulations 2 and 40

Permissible exposure levels of toxic substances

Toxic Substance

Permissible Exposure Level (PEL)

PEL (Long Term)

PEL (Short Term)

ppm^a

mg/m^{3 b}

ppm^a

mg/m^{3 b}

Acetaldehyde

—

Acetic acid

Acetic anhydride

—

Acetone

750

1780

1000

2380

Acetone cyanohydrin

—

4.7

Acetonitrile

101

Acetophenone

—

Acetylene tetrabromide

—

Acrolein

0.1

0.23

0.3

0.69

Acrylamide

—

0.03

—

Acrylic acid

5.9

—

Acrylonitrile (Vinyl cyanide)

4.3

—

Adipic acid

—

Adiponitrile

8.8

—

Aldrin

—

0.25

—

Allyl alcohol

4.8

9.5

Allyl chloride

Allyl glycidyl ether (AGE)

Allyl propyl disulfide

Aluminium

Metal dust

—

Pyro powders, as Al

—

Welding fumes, as Al

—

Soluble salts, as Al

—

Alkyls, as Al

—

Aluminium oxide

—

2-Aminopyridine

0.5

1.9

—

Amitrole

—

0.2

—

Ammonia

Ammonium chloride fume

—

Ammonium perfluorooctanoate

—

0.01

—

Ammonium sulfamate

—

n-Amyl acetate

100

532

—

sec-Amyl acetate

125

665

—

Aniline

7.6

—

Anisidine

0.1

0.5

—

Antimony and compounds, as Sb

—

0.5

—

Antimony trioxide, as Sb

—

0.5

—

Arsenic, elemental and inorganic compounds, as As

—

0.01

—

Arsine

0.05

0.16

—

Asbestos (all forms)

—

0.1 (fibre/cc)

—

Asphalt (petroleum) fumes

—

Atrazine

—

Azinphos-methyl

—

0.2

—

Barium, soluble compounds, as Ba

—

0.5

—

Barium sulfate

—

Benomyl

0.84

—

Benzene

3.18

—

Benzoyl peroxide

—

Benzyl chloride

5.2

—

Beryllium and compounds, as Be

—

0.002

—

Biphenyl

0.2

1.3

—

Bismuth telluride,

Undoped

—

Se-doped

—

Borates, tetra sodium salts

Anhydrous

—

Decahydrate

—

Pentahydrate

—

Boron oxide

—

Boron tribromide

—

Boron trifluoride

—

2.8

Bromacil

—

Bromine

0.1

0.66

0.2

1.3

Bromine pentafluoride

0.1

0.72

—

Bromoform

0.5

5.2

—

1,3-Butadiene

4.4

—

Butane

800

1900

—

n-Butanol

—

152

sec-Butanol

100

303

—

tert-Butanol

100

303

—

2-Butoxyethanol (EGBE)

121

—

n-Butyl acetate

150

713

200

950

sec-Butyl acetate

200

950

—

tert-Butyl acetate

200

950

—

n-Butyl acrylate

—

n-Butylamine

—

tert-Butyl chromate, as CrO₃

—

0.1

n-Butyl glycidyl ether (BGE)

133

—

0.1

n-Butyl lactate

—

Butyl mercaptan (Butanethiol)

0.5

1.8

—

o-sec-Butylphenol

—

p-tert-Butyl toluene

6.1

—

Cadmium, as Cd

Elemental

—

0.01

—

Compounds

—

0.002

—

Calcium carbonate (Limestone, Marble)

—

Calcium chromate, as Cr

—

0.001

—

Calcium cyanamide

—

0.5

—

Calcium cyanide

—

Calcium hydroxide

—

Calcium oxide

—

Calcium silicate

—

Calcium sulfate

—

Camphor

Caprolactam

Dust

—

Vapour

Captafol

—

0.1

—

Captan

—

Carbaryl

—

Carbofuran

—

0.1

—

Carbon black

—

3.5

—

Carbon dioxide

5000

9000

30,000

54,000

Carbon disulfide

—

Carbon monoxide

—

Carbon tetrabromide

0.1

1.4

0.3

4.1

Carbon tetrachloride
(Tetrachloromethane)

Carbonyl fluoride

5.4

Catechol (Pyrocatechol)

—

Cellulose

—

Cesium hydroxide

—

Chlordane

—

0.5

—

Chlorinated camphene (Toxaphene)

—

0.5

—

Chlorinated diphenyl oxide

—

0.5

—

Chlorine

0.5

1.5

2.9

Chlorine dioxide

0.1

0.28

0.3

0.83

Chlorine trifluoride

—

0.1

0.38

Chloroacetaldehyde

—

3.2

Chloroacetone

—

3.8

2-Chloroacetophenone (Phenacyl chloride)

0.05

0.32

—

Chloroacetyl chloride

0.05

0.23

0.15

0.69

Chlorobenzene (Monochlorobenzene)

—

o-Chlorobenzylidene malononitrile

—

0.05

0.39

Chlorobromomethane
(Bromochloromethane)

200

1060

—

Chlorodifluoromethane

1000

3540

—

Chlorodiphenyl (42% chlorine)

—

Chlorodiphenyl (54% chlorine)

—

0.5

—

Chloroform (Trichloromethane)

—

bis (Chloromethyl) ether

0.001

0.0047

—

1-Chloro-1-nitropropane

—

Chloropentafluoroethane

1000

6320

—

Chloropicrin (Trichloronitromethane)

0.1

0.67

—

β;-Chloroprene (2-Chloro-1,3-butadiene)

—

2-Chloropropionic acid

0.1

0.44

—

o-Chlorostyrene

283

425

o-Chlorotoluene

259

—

Chlorpyrifos

—

0.2

—

Chromium, metal and inorganic compounds, as Cr

Metal and Cr III compounds

—

0.5

—

Water-soluble Cr VI compounds

—

0.05

—

Insoluble Cr VI compounds

—

0.01

—

Chromyl chloride

0.025

0.16

—

Clopidol

—

Coal, respirable dust

—

Coal tar pitch volatiles (Polycylic aromatic hydrocarbons), as benzene solubles

—

0.2

—

Cobalt, elemental and inorganic compounds, as Co

—

0.02

—

Cobalt carbonyl, as Co

—

0.1

—

Cobalt hydrocarbonyl, as Co

—

0.1

—

Copper

Fume

—

0.2

—

Dusts and mists, as Cu

—

Cotton dust, raw

—

0.2

—

Cresol

—

Crotonaldehyde

5.7

—

Crufomate

—

Cumene

246

—

Cyanamide

—

Cyanogen

—

Cyanogen chloride

—

0.3

0.75

Cyclohexane

300

1030

—

Cyclohexanol

206

—

Cyclohexanone

100

—

Cyclohexene

300

1010

—

Cyclohexylamine

—

Cyclonite

—

1.5

—

Cyclopentadiene

203

—

Cyclopentane

600

1720

—

Cyhexatin (Tricyclo hexyltin)

—

DDT (Dichlorodiphenyltrichloroethane)

—

Decaborane

0.05

0.25

0.15

0.75

Demeton

0.01

0.11

—

Diacetone alcohol
(4-Hydroxy-4-methyl-2-pentanone)

238

—

Diazinon

—

0.1

—

Diazomethane

0.2

0.34

—

Diborane

0.1

0.11

—

2-N-Dibutylaminoethanol

0.5

3.5

—

Dibutyl phenyl phosphate

0.3

3.5

—

Dibutyl phosphate

8.6

Dibutyl phthalate

—

Dichloroacetylene

—

0.1

0.39

o-Dichlorobenzene

150

301

p-Dichlorobenzene

—

1,4-Dichloro-2-butene

0.005

0.025

—

Dichlorodifluoromethane

1000

4950

—

1,3-Dichloro-5,5-dimethyl hydantoin

—

0.2

—

0.4

1,1-Dichloroethane
(Ethylidene chloride)

100

405

—

1,2-Dichloroethylene
(Acetylene dichloride)

200

793

—

Dichloroethyl ether

Dichlorofluoromethane

—

1,1-Dichloro-1-nitroethane

—

1,3-Dichloropropene

4.5

—

2,2-Dichloropropionic acid

5.8

—

Dichlorotetrafluoroethane

1000

6990

—

Dichlorvos

0.1

0.90

—

Dicrotophos

—

0.25

—

Dicyclopentadiene

—

Dicyclopentadienyl iron

—

Dieldrin

—

0.25

—

Diethanolamine

0.46

—

Diethylamine

2-Diethylaminoethanol

9.6

—

Diethylene triamine

4.2

—

Diethyl ketone

200

705

—

Diethyl phthalate

—

Difluorodibromomethane

100

858

—

Diglycidyl ether (DGE)

0.1

0.53

—

Diisobutyl ketone (2,6-Dimethyl-4-heptanone)

145

—

Diisopropylamine

—

N,N-Dimethyl acetamide

—

Dimethylamine

9.2

27.6

Dimethylaniline
(N,N-Dimethylaniline)

Dimethylformamide

—

1,1-Dimethylhydrazine

0.5

1.2

—

Dimethylphthalate

—

Dimethyl sulfate

0.1

0.52

—

Dinitolmide (3,5-Dinitro-o-toluamide)

—

Dinitrobenzene

0.15

1.0

—

Dinitro-o-cresol

—

0.2

—

Dinitrotoluene

—

0.15

—

Dioxane

—

Dioxathion

—

0.2

—

Diphenylamine

—

Dipropylene glycol methyl ether

100

606

150

909

Dipropyl ketone

233

—

Diquat

Total dust

—

0.5

—

Respirable dust

—

0.1

—

Di-sec-octyl phthalate (Di (-2-ethylhexyl) phthalate)

—

Disulfiram

—

Disulfoton

—

0.1

—

2,6-Di-tert-butyl-p-cresol

—

Diuron

—

Divinyl benzene

—

Emery

—

Endosulfan

—

0.1

—

Endrin

—

0.1

—

Enflurane

566

—

Epichlorohydrin (1-Chloro-2, 3-epoxypropane)

7.6

—

EPN

—

0.1

—

Ethanol (Ethyl alcohol)

1000

1880

—

Ethanolamine

7.5

Ethion

—

0.4

—

2-Ethoxyethanol (EGEE)

—

2-Ethoxyethyl acetate (EGEEA)

—

Ethyl acetate

400

1440

—

Ethyl acrylate

Ethylamine

9.2

27.6

Ethyl amyl ketone (5-Methyl-3-heptanone)

131

—

Ethyl benzene

100

434

125

543

Ethyl bromide

—

Ethyl butyl ketone (3-Heptanone)

234

—

Ethyl chloride

1000

2640

—

Ethylene chlorohydrin

—

3.3

Ethylenediamine (1,2-Diaminoethane)

—

Ethylene dichloride (1,2-Dichloroethane)

—

Ethylene glycol

—

127

Ethylene glycol dinitrate

0.05

0.31

—

Ethylene oxide

1.8

—

Ethylenimine

0.5

0.88

—

Ethyl ether (Diethyl ether)

400

1210

500

1520

Ethyl formate

100

303

—

Ethylidene norbornene

—

Ethyl mercaptan (Ethanethiol)

0.5

1.3

—

N-Ethylmorpholine

—

Ethyl silicate

—

Fenamiphos

—

0.1

—

Fensulfothion

—

0.1

—

Fenthion

—

0.2

—

Ferbam

—

Ferrovanadium dust

—

Fibrous glass dust

—

Fluorides, as F

—

2.5

—

Fluorine

1.6

3.1

Fonofos

—

0.1

—

Formaldehyde

—

0.3

0.37

Formamide

—

Formic acid

9.4

Furfural

7.9

—

Furfuryl alcohol

Gasoline

300

890

500

1480

Germanium tetrahydride

0.2

0.63

—

Glutaraldehyde

—

0.2

0.82

Glycerin mist

—

Glycidol (2,3-Epoxy-1-propanol)

—

Grain dust (oat, wheat, barley)

—

Graphite, respirable dust

—

Hafnium

—

0.5

—

Halothane

404

—

Heptachlor and Heptachlor epoxide

—

0.05

—

Heptane

400

1640

500

2050

Hexachlorobenzene

—

0.025

—

Hexachlorobutadiene

0.02

0.21

—

Hexachlorocyclopentadiene

0.01

0.11

—

Hexachloroethane

9.7

—

Hexachloronaphthalene

—

0.2

—

Hexafluoroacetone

0.1

0.68

—

Hexamethylene diisocyanate

0.005

0.034

—

1,6-Hexanediamine

0.5

2.3

—

Hexane (n-Hexane)

176

—

Other isomers

500

1760

1000

3500

sec-Hexyl acetate

295

—

Hexylene glycol

—

121

Hydrazine

0.1

0.13

—

Hydrogenated terphenyls

0.5

4.9

—

Hydrogen bromide

—

9.9

Hydrogen chloride

—

7.5

Hydrogen cyanide

—

4.7

Hydrogen fluoride

—

2.6

Hydrogen peroxide

1.4

—

Hydrogen selenide

0.05

0.16

—

Hydrogen sulfide

Hydroquinone (Dihydroxy benzene)

—

2-Hydroxypropyl acrylate

0.5

2.8

—

Indene

—

Indium and compounds, as In

—

0.1

—

Iodine

—

0.1

1.0

Iodoform

0.6

—

Iron oxide dust and fume, as Fe

—

Iron pentacarbonyl, as Fe

0.1

0.23

0.2

0.45

Iron salts, soluble, as Fe

—

Isoamyl acetate

100

532

—

Isoamyl alcohol

100

361

125

452

Isobutyl acetate

150

713

—

Isobutyl alcohol

152

—

Isooctyl alcohol

266

—

Isophorone

—

Isophorone diisocyanate

0.005

0.045

—

Isoproproxyethanol

106

—

Isopropyl acetate

250

1040

310

1290

Isopropyl alcohol

400

983

500

1230

Isopropylamine

N-Isopropylaniline

—

Isopropyl ether

250

1040

310

1300

Isopropyl glycidyl ether (IGE)

238

356

Kaolin, respirable dust

—

Ketene

0.5

0.86

1.5

2.6

Lead, inorganic dusts and fumes, as Pb

—

0.15

—

Lead arsenate

—

0.15

—

Lead chromate

as Pb

—

0.05

—

as Cr

—

0.012

—

Lindane

—

0.5

—

Lithium hydride

—

0.025

—

L.P.G. (Liquified petroleum gas)

1000

1800

—

Magnesite

—

Magnesium oxide fume

—

Malathion

—

Maleic anhydride

0.25

1.0

—

Manganese, as Mn

Dust and compounds

—

Fume

—

Manganese cyclopentadienyl tricarbonyl, as Mn

—

0.1

—

Mercury

Alkyl compounds

—

0.01

—

0.03

Aryl compounds

—

0.1

—

Inorganic forms including metallic mercury

—

0.025

—

Mesityl oxide

100

Methacrylic acid

—

Methanol (Methyl alcohol)

200

262

250

328

Methomyl

—

2.5

—

Methoxychlor

—

2-Methyoxyethanol (EGME)

—

2-Methoxyethyl acetate (Ethylene glycol methyl ethyl acetate, EGMEA)

—

4-Methoxyphenol

—

Methyl acetate

200

606

250

757

Methyl acetylene (Propyne)

1000

1640

—

Methyl acetylene-propadiene mixture
(MAPP)

1000

1640

1250

2050

Methyl acrylate

—

Methylacrylonitrile

2.7

—

Methylal (Dimethoxymethane)

1000

3110

—

Methylamine

6.4

Methyl n-amyl ketone (2-Heptanone)

233

—

N-Methyl aniline

0.5

2.2

—

Methyl bromide

—

Methyl-tert butyl ether

144

—

Methyl n-butyl ketone (2-Hexanone)

—

Methyl chloride

103

100

207

Methyl 2-cyanoacrylate

9.1

Methylcyclohexane

400

1610

—

Methylcyclohexanol

234

—

0-Methylcyclohexanone

229

344

2-Methylcyclopentadienyl manganese tricarbonyl, as Mn

—

0.2

—

Methyl demeton

—

0.5

—

Methylene bisphenyl isocyanate (MDI, Diphenyl methane diisocyanate)

0.005

0.051

—

Methylene chloride (Dichloromethane)

174

—

4,4’-methylene bis (2-chloroaniline)
[MOCA]

0.01

0.11

—

Methylene bis (4-cyclo-hexylisocyanate)

0.005

0.054

—

4,4’-Methylene dianiline

0.1

0.81

—

Methyl ethyl ketone (MEK, 2-Butanone)

200

590

300

885

Methyl ethyl ketone peroxide

—

0.2

1.5

Methyl formate

100

246

150

368

Methyl hydrazine

—

0.2

0.38

Methyl iodide

—

Methyl isoamyl ketone

234

—

Methyl isobutyl carbinol (Methyl amyl alcohol)

104

167

Methyl isobutyl ketone (Hexone)

205

307

Methyl isocyanate

0.02

0.047

—

Methyl isopropyl ketone

200

705

—

Methyl mercaptan (Methanethiol)

0.5

0.98

—

Methyl methacrylate

100

410

—

Methyl parathion

—

0.2

—

Methyl propyl ketone (2-Pentanone)

200

705

250

881

Methyl silicate

—

α;Methyl styrene

242

100

483

Metribuzin

—

Mevinphos (Phosdrin)

0.01

0.092

0.03

0.27

Mica, respirable dust

—

Mineral wool fiber

—

Molybdenum, as Mo

Soluble compounds

—

Insoluble compounds

—

Monocrotophos

—

0.25

—

Morpholine

—

Naled (Dimethyl-1,2-dibromo-2,2 dichloroethyl phosphate)

—

Naphtha

300

1370

—

Naphthalene

Nickel

Metal

—

Insoluble compounds, as Ni

—

Soluble compounds, as Ni

—

0.1

—

Nickel carbonyl, as Ni

0.05

0.12

—

Nickel sulfide, as Ni

—

Nicotine

—

0.5

—

Nitrapyrin (2-Chloro-6-(trichloromethyl) pyridine)

—

Nitric acid

5.2

Nitric oxide

—

p-Nitroaniline

—

Nitrobenzene

—

p-Nitrochlorobenzene

0.1

0.64

—

Nitroethane

100

307

—

Nitrogen dioxide

5.6

9.4

Nitrogen trifluoride

—

Nitroglycerin (NG)

0.05

0.46

—

Nitromethane

—

1-Nitropropane

—

2-Nitropropane

—

Nitrotoluene

—

Nitrous oxide

—

Nonane

200

1050

—

Nuisance particulates

—

Octachloronaphthalene

—

0.1

—

0.3

Octane

300

1400

375

1750

Oil Mist, mineral

—

Osmium tetroxide, as Os

0.0002

0.0016

0.0006

0.0047

Oxalic acid

—

Oxygen difluoride

—

0.05

0.11

Ozone

—

0.1

0.20

Paraffin wax fume

—

Paraquat

Total dust

—

0.5

—

Respirable dust

—

0.1

—

Parathion

—

0.1

—

Pentaborane

0.005

0.013

0.015

0.039

Pentachloronaphthalene

—

0.5

—

Pentachloronitrobenzene

—

0.5

—

Pentachlorophenol

—

0.5

—

Pentaerythritol

—

Pentane

600

1770

750

2210

Perchloroethylene (Tetrachloroethylene)

170

100

685

Perchloromethyl mercaptan

0.1

0.76

—

Perchloryl fluoride

Perfluoroisobutylene

—

0.01

0.082

Perlite

—

Phenol

—

Phenothiazine

—

Phenylenediamine

—

0.1

—

Phenyl ether

Phenyl glycidyl ether (PGE)

0.1

0.6

—

Phenylhydrazine

0.1

0.44

—

Phenyl mercaptan

0.5

2.3

—

Phenylphosphine

—

0.05

0.23

Phorate

—

0.05

—

0.2

Phosgene

0.1

0.40

—

Phosphine

0.3

0.42

1.4

Phosphoric acid

—

Phosphorus

0.02

0.1

—

Phosphorus oxychloride

0.1

0.63

—

Phosphorus pentachloride

0.1

0.85

—

Phosphorus pentasulfide

—

Phosphorus trichloride

0.2

1.1

0.5

2.8

Phthalic anhydride

6.1

—

m-Phthalodinitrile

—

Picloram

—

Picric acid (2,4,6-Trinitrophenol)

—

0.1

—

Pindone (2-Pivalyl-1,3-indandione)

—

0.1

—

Piperazine dihydrochloride

—

Platinum

Metal

—

Soluble salts, as Pt

—

0.002

—

Portland cement

—

Potassium cyanide

—

Potassium hydroxide

—

Propargyl alcohol

2.3

—

β-Propiolactone

0.5

1.5

—

Propionic acid

—

Propoxur

—

0.5

—

n-Propyl acetate

200

835

250

1040

n-Propyl alcohol

200

492

250

614

Propylene dichloride
(1,2-Dichloropropane)

347

110

508

Propylene glycol dinitrate

0.05

0.34

—

Propylene glycol monomethyl ether

100

369

150

553

Propylene imine

4.7

—

Propylene oxide (1,2-Epoxypropane)

—

n-Propyl nitrate

107

172

Pyrethrum

—

Pyridine

—

Quinone

0.1

0.44

—

Resorcinol

Rhodium

Metal

—

Insoluble compounds, as Rh

—

Soluble compounds, as Rh

—

0.01

—

Ronnel

—

Rotenone

—

Rouge

—

Selenium and compounds, as Se

—

0.2

—

Selenium hexafluoride

0.05

0.16

—

Sesone

—

Silica-Amorphous

Diatomaceous earth (uncalcined)

—

Precipitated silica

—

Silica, fume, respirable dust

—

Silica, fused, respirable dust

—

0.1

—

Silica gel

—

Silica-Crystalline

Cristobalite, respirable dust

—

0.05

—

Quartz, respirable dust

—

0.1

—

Tridymite, respirable dust

—

0.05

—

Tripoli, respirable dust

—

0.1

—

Silicon

—

Silicon carbide

—

Silicon tetrahydride

6.6

—

Silver

Metal

—

0.1

—

Soluble compounds, as Ag

—

0.01

—

Soapstone

Respirable dust

—

Total dust

—

Sodium azide as Hydrazoic acid

—

0.29

vapour

—

0.11

—

Sodium bisulfite

—

Sodium cyanide

—

Sodium fluoroacetate

—

0.05

—

Sodium hydroxide

—

Sodium metabisulfite

—

Starch

—

Stearates

—

Stibine

0.1

0.51

—

Stoddard solvent

100

525

—

Strontium chromate

—

0.0005

—

Strychnine

—

0.15

—

Styrene, monomer (Phenylethylene, vinyl benzene)

213

100

426

Subtilisins

—

0.00006

Sucrose

—

Sulfometuron methyl

—

Sulfotep

—

0.2

—

Sulfur dioxide

5.2

Sulfur hexafluoride

1000

5970

—

Sulfuric acid

—

Sulfur monochloride

—

5.5

Sulfur pentafluoride

—

0.01

0.10

Sulfur tetrafluoride

—

0.1

0.44

Sulfuryl fluoride

Sulprofos

—

Talc

—

Tantalum, metal and oxide, as Ta

—

Tellurium and compounds, as Te

—

0.1

—

Tellurium hexafluoride

0.02

0.10

—

Temephos

—

Terephthalic acid

—

TEPP

0.004

0.047

—

Terphenyls

—

0.53

1,1,1,2-Tetrachloro-2,2-difluoroethane

500

4170

—

1,1,2,2-Tetrachloro-1,2-difluoroethane

500

4170

—

1,1,2,2-Tetrachloroethane

6.9

—

Tetrachloronaphthalene

—

Tetraethyl lead, as Pb

—

0.1

—

Tetrahydrofuran

200

590

250

737

Tetramethyl lead, as Pb

—

0.15

—

Tetramethyl succinonitrile

0.5

2.8

—

Tetranitromethane

0.005

0.04

—

Tetrasodium pyrophosphate

—

Tetryl (2,4,6-Trinitrophenyl methylnitramine)

—

1.5

—

Thallium, elemental and soluble compounds, as Ti

—

0.1

—

4,4’-Thiobis (6-tert-butyl-m-cresol)

—

Thioglycolic acid

3.8

—

Thioyl chloride

—

4.9

Thiram

—

Tin

Metal

—

Oxide inorganic compounds, as Sn

—

Organic compounds, as Sn

—

0.1

—

0.2

Titanium dioxide

—

Toluene (Toluol)

188

—

Toluene-2,4-diisocyanate (TDI)

0.005

0.036

0.02

0.14

Toluidine

8.8

—

Tributyl phosphate

0.2

2.2

—

Trichloroacetic acid

6.7

—

1,2,4-Trichlorobenzene

—

1,1,1-Trichloroethane (Methyl chloroform)

350

1910

450

2460

1,1,2-Trichloroethane

—

Trichloroethylene

269

100

537

Trichlorofluoromethane

—

1000

5620

Trichloronaphthalene

—

1,2,3-Trichloropropane

—

1,1,2-Trichloro-1,2,2-trifluoroethane

1000

7670

1250

9590

Triethanolamine

—

Triethylamine

4.1

20.7

Trifluorobromomethane

1000

6090

—

Trimellitic anhydride

—

0.04

Trimethylamine

Trimethyl benzene

123

—

Trimethyl phosphite

—

2,4,6-Trinitrotoluene (TNT)

—

0.5

—

Triorthocresyl phosphate

—

0.1

—

Triphenyl amine

—

Triphenyl phosphate

—

Tungsten, as W

Insoluble compounds

—

Soluble compounds

—

Turpentine

100

566

—

Uranium

Soluble & Insoluble compounds, as U

—

0.2

—

0.6

n-Valeraldehyde

176

—

Vanadium pentoxide Respirable dust or fume

—

0.05

—

Vegetable oil mists

—

Vinyl acetate

Vinyl bromide

—

Vinyl chloride (Chloroethylene)

—

4-Vinyl cyclohexene

0.1

0.4

—

Vinyl cyclohexene dioxide

—

Vinylidene chloride (1,1-Dichloroethylene)

Vinyl toluene

242

100

483

Warfarin

—

0.1

—

Welding fumes

—

Wood dust

Hard wood

—

Soft wood

—

Xylene

100

434

150

651

m-Xylene α;, α;1-diamine

—

0.1

Xylidine (dimethylaminobenzene)

0.5

2.5

—

Yttrium metal and compounds, as Y

—

Zinc chloride fume

—

Zinc chromates, as Cr

—

0.01

—

Zinc oxide

Fume

—

Dust

—

Zirconium and compounds, as Zr

—

Notes:

(a)	ppm means parts of the substance per million parts of contaminated air by volume; and

(b)	mg/m³ means milligrammes of the substance per cubic metre of contaminated air.

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