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Table Z-1-Limits for Air Contaminants
Substance CASNo.
(c)
ppm
(a) 1
mg/m3(b) 1 Skin
designation
Acetaldehyde 75-07-0 200 360
Acetic acid 64-19-7 10 25
Acetic anhydride 108-24-7 5 20
Acetone 67-64-1 1000 2400
Acetonitrile 75-05-8 40 70
2-Acetylaminofluorine; see 1910.1014 53-96-3
Acetylene dichloride; see 1,2-Dichloroethylene.
Acetylene tetrabromide 79-27-6 1 14
Acrolein 107-02-8 0.1 0.25
Acrylamide 79-06-1 0.3 X
Acrylonitrile; see 1910.1045 107-13-1

Aldrin 309-00-2 0.25 X
Allyl alcohol 107-18-6 2 5 X
Allyl chloride 107-05-1 1 3
Allyl glycidyl ether (AGE) 106-92-3 (C)10 (C)45
Allyl propyl disulfide 2179-59-1 2 12
alpha-Alumina 1344-28-1
Total dust
15
Respirable fraction

5
Aluminum, metal (as Al) 7429-90-5
Total dust
15
Respirable fraction
5
4-Aminodiphenyl; see 1910.1011 92-67-1
2-Aminoethanol; see Ethanolamine.
2-Aminopyridine 504-29-0 0.5 2
Ammonia 7664-41-7 50 35
Ammonium sulfamate 7773-06-0
Total dust
15
Respirable fraction
5
n-Amyl acetate 628-63-7 100 525
sec-Amyl acetate 626-38-0 125 650
Aniline and homologs 62-53-3 5 19 X
Anisidine (o-, p-isomers) 29191-52-4 0.5 X
Antimony and compounds (as Sb) 7440-36-0 0.5
ANTU (alpha Naphthylthiourea) 86-88-4 0.3
Arsenic, inorganic compounds (as As); see 1910.1018
7440-38-2
Arsenic, organic compounds (as As) 7440-38-2 0.5
Arsine 7784-42-1 0.05 0.2
Asbestos; see 1910.1001 (4)
Azinphos-methyl 86-50-0 0.2 X
Barium, soluble compounds (as Ba) 7440-39-3 0.5
Barium sulfate 7727-43-7
Total dust
15
Respirable fraction
5
Benomyl 17804-35-2
Total dust
15
Respirable fraction
5
Benzene; see 1910.1028 71-43-2
See Table Z-2 for the limits applicable in the operations or sectors excluded in 1910.1028d
Benzidine; see 1910.1010 92-87-5
p-Benzoquinone; see Quinone.
Benzo(a)pyrene; see Coal tar pitch volatiles.
Benzoyl peroxide 94-36-0 5
Benzyl chloride 100-44-7 1 5
Beryllium and beryllium compounds (as Be); see 1910.1024 8 7440-41-7
Biphenyl; see Diphenyl.
Bismuth telluride, Undoped 1304-82-1
Total dust
15
Respirable fraction
5
Boron oxide 1903-86-2
Total dust
15
Boron trifluoride 7637-07-2 (C)1 (C)3
Bromine 7726-95-6 0.1 0.7
Bromoform 75-25-2 0.5 5 X
Butadiene (1,3-Butadiene); See 29 CFR 1910.1051; 29 CFR 1910.19(l) 106-99-0 1 ppm/5 ppm
STEL
Butanethiol; see Butyl mercaptan.
2-Butanone (Methyl ethyl ketone) 78-93-3 200 590
2-Butoxyethanol 111-76-2 50 240 X
n-Butyl-acetate 123-86-4 150 710
sec-Butyl acetate 105-46-4 200 950
tert-Butyl acetate 540-88-5 200 950
n-Butyl alcohol 71-36-3 100 300
sec-Butyl alcohol 78-92-2 150 450
tert-Butyl alcohol 75-65-0 100 300
Butylamine 109-73-9 (C)5 C(15)
tert-Butyl chromate (as CrO3); see 1910.10266 1189-85-1
n-Butyl glycidyl ether (BGE) 2426-08-6 50 270
Butyl mercaptan 109-79-5 10 35
p-tert-Butyltoluene 98-51-1 10 60
Cadmium (as Cd); see 1910.1027 7440-43-9
Calcium carbonate 1317-65-3
Total dust 15
Respirable fraction 5
Calcium hydroxide 1305-62-0
Total dust 15
Respirable fraction 5
Calcium oxide 1305-78-8 5
Calcium silicate 1344-95-2
Total dust 15
Respirable fraction
5
Calcium sulfate 7778-18-9
Total dust 15
Respirable fraction 5
Camphor, synthetic 76-22-2 2
Carbaryl (Sevin) 63-25-2 5
Carbon black 1333-86-4 3.5
Carbon dioxide 124-38-9 5000 9000
Carbon disulfide 75-15-0 (2)
Carbon monoxide 630-08-0 50 55
Carbon tetrachloride 56-23-5 (2)
Cellulose 9004-34-6
Total dust 15
Respirable fraction 5
Chlordane 57-74-9 0.5 X
Chlorinated camphene 8001-35-2 0.5 X
Chlorinated diphenyl oxide 55720-99-5 0.5
Chlorine 7782-50-5 (C)1
(C)3
Chlorine dioxide 10049-04-4 0.1 0.3
Chlorine trifluoride 7790-91-2 (C)0.1 (C)0.4
Chloroacetaldehyde 107-20-0 (C)1 (C)3
a-Chloroacetophenone (Phenacyl chloride) 532-27-4 0.05 0.3
Chlorobenzene 108-90-7 75 350
o-Chlorobenzylidene malononitrile 2698-41-1 0.05 0.4
Chlorobromomethane 74-97-5 200 1050
2-Chloro-1,3-butadiene; see beta-Chloroprene.
Chlorodiphenyl (42% Chlorine) (PCB) 53469-21-9 1 X
Chlorodiphenyl (54% Chlorine) (PCB) 11097-69-1 0.5 X
1-Chloro-2,3-epoxypropane; see Epichlorohydrin.
2-Chloroethanol; see Ethylene chlorohydrin.
Chloroethylene; see Vinyl chloride.
Chloroform (Trichloromethane) 67-66-3 (C)50 (C)240
bis(Chloromethyl) ether; see 1910.1008 542-88-1
Chloromethyl methyl ether; see 1910.1006 107-30-2
1-Chloro-1-nitropropane 600-25-9 20 100
Chloropicrin 76-06-2 0.1 0.7
beta-Chloroprene 126-99-8 25 90
X
2-Chloro-6-(trichloromethyl) pyridine 1929-82-4
Total dust 15
Respirable fraction 5
Chromium (II) compounds.
(as Cr) 7440-47-3 0.5
Chromium (III) compounds.
(as Cr) 7440-47-3 0.5
Chromium (VI) compounds; See 1910.10265
Chromium metal and insol. salts(as Cr) 7440-47-3 1
Chrysene; see Coal tar pitch volatiles.
Clopidol 2971-90-6
Total dust 15
Respirable fraction 5
Coal dust (less than 5% SiO2), respirable fraction (3)
Coal dust (greater than or equal to 5% SiO2), respirable fraction (3)
Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene 65966-93-2 0.2
Cobalt metal, dust, and fume (as Co) 7440-48-4 0.1
Coke oven emissions; see 1910.1029.
Copper 7440-50-8
Fume (as Cu) 0.1
Dusts and mists (as Cu) 1
Cotton duste; see 1910.1043 1
Crag herbicide (Sesone) 136-78-7
Total dust 15
Respirable fraction 5
Cresol, all isomers 1319-77-3 5 22 X
Crotonaldehyde 123-73-9;
4170-30-3
2 6
Cumene 98-82-8 50 245 X
Cyanides (as CN) (4) 5 X
Cyclohexane 110-82-7 300 1050
Cyclohexanol 108-93-0 50 200
Cyclohexanone 108-94-1 50 200
Cyclohexene 1101-83-8 300 1015
Cyclopentadiene 542-92-7 75 200
2,4-D (Dichlorophenoxyacetic acid) 94-75-7 10
Decaborane 17702-41-9 0.05 0.3 X
Demeton (Systox) 8065-48-3 0.1 X
Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone) 123-42-2 50
240
1,2-Diaminoethane; see Ethylenediamine.
Diazomethane 334-88-3 0.2 0.4
Diborane 19287-45-7 0.1 0.1
1,2-Dibromo-3-chloropropane (DBCP); see 1910.1044 96-12-8
1,2-Dibromoethane; see Ethylene dibromide.
Dibutyl phosphate 107-66-4 1 5
Dibutyl phthalate 84-74-2 5
o-Dichlorobenzene 95-50-1 (C)50 (C)300
p-Dichlorobenzene 106-46-7 75 450
3,'-Dichlorobenzidine; see 1910.1007 91-94-1
Dichlorodifluoromethane 75-71-8 1000 4950
1,3-Dichloro-5,5-dimethyl hydantoin 118-52-5 0.2
Dichlorodiphenyltrichloroethane (DDT) 50-29-3
1 X
1,1-Dichloroethane 75-34-3 100 400
1,2-Dichloroethane; see Ethylene dichloride.
1,2-Dichloroethylene 540-59-0 200 790
Dichloroethyl ether 111-44-4 (C)15 (C)90 X
Dichloromethane; see Methylene chloride.
Dichloromonofluoromethane 75-43-4 1000 4200
1,1-Dichloro-1-nitroethane 594-72-9 (C)10 (C)60
1,2-Dichloropropane; see Propylene dichloride.
Dichlorotetrafluoroethane 76-14-2 1000 7000
Dichlorvos (DDVP) 62-73-7
1 X
Dicyclopentadienyl iron 102-54-5
Total dust 15
Respirable fraction 5
Dieldrin 60-57-1 0.25 X
Diethylamine 109-89-7 25 75
2-Diethylaminoethanol 100-37-8 10 50 X
Diethyl ether; see Ethyl ether.
Difluorodibromomethane 75-61-6 100 860
Diglycidyl ether (DGE) 2238-07-5 (C)0.5 (C)2.8
Dihydroxybenzene; see Hydroquinone.
Diisobutyl ketone 108-83-8 50 290
Diisopropylamine 108-18-9 5 20 X
4-Dimethylaminoazobenzene; see 1910.1015 60-11-7
Dimethoxymethane; see Methylal.
Dimethyl acetamide 127-19-5 10 35 X
Dimethylamine 124-40-3 10 18
Dimethylaminobenzene; see Xylidine
Dimethylaniline (N,N-Dimethylaniline) 121-69-7 5 25 X
Dimethylbenzene; see Xylene.
Dimethyl-1,2-dibromo-2,2-dichloroethyl phosphate 300-76-5 3
Dimethylformamide 68-12-2 10 30 X
2,6-Dimethyl-4-heptanone; see Diisobutyl ketone.
1,1-Dimethylhydrazine 57-14-7 0.5 1 X
Dimethylphthalate 131-11-3 5
Dimethyl sulfate 77-78-1 1 5 X
Dinitrobenzene (all isomers) 1 X
(ortho)
528-29-0
(meta)
99-65-0
(para)
100-25-4
Dinitro-o-cresol 534-52-1
0.2 X
Dinitrotoluene 25321-14-6 1.5 X
Dioxane (Diethylene dioxide) 123-91-1 100 360 X
Diphenyl (Biphenyl) 92-52-4 0.2 1
Diphenylmethane diisocyanate; see Methylene bisphenyl isocyanate.
Dipropylene glycol methyl ether 345590-94-8 100 600 X
Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate) 117-81-7 5
Emery 12415-34-8
Total dust
15
Respirable fraction
5
Endrin 72-20-8 0.1
X
Epichlorohydrin 106-89-8 5 19
X
EPN 2104-64-5 0.5 X
1,2-Epoxypropane; see Propylene oxide.
2,3-Epoxy-1-propanol; see Glycidol.
Ethanethiol; see Ethyl mercaptan.
Ethanolamine 141-43-5 3 6
2-Ethoxyethanol (Cellosolve) 110-80-5 200 740 X
2-Ethoxyethyl acetate (Cellosolve acetate) 111-15-9 100 540 X
Ethyl acetate 141-78-6 400 1400
Ethyl acrylate 140-88-5 25 100 X
Ethyl alcohol (Ethanol) 64-17-5 1000 1900
Ethylamine 75-04-7 10 18
Ethyl amyl ketone (5-Methyl-3-heptanone) 541-85-5 25 130
Ethyl benzene 100-41-4
100 435
Ethyl bromide 74-96-4 200 890
Ethyl butyl ketone (3-Heptanone) 106-35-4 50 230
Ethyl chloride 75-00-3 1000 2600
Ethyl ether 60-29-7 400 1200
Ethyl formate 109-94-4 100 300
Ethyl mercaptan 75-08-1
(C)10 (C)25
Ethyl silicate 78-10-4
100 850
Ethylene chlorohydrin 107-07-3 5 16 X
Ethylenediamine 107-15-3 10 25
Ethylene dibromide 106-93-4 (2)
Ethylene dichloride (1,2-Dichloroethane) 107-06-2 (2)
Ethylene dichloride (1,2-Dichloroethane) 628-96-6 (C)0.2 (C)1 X
Ethylene glycol methyl acetate; see Methyl cellosolve acetate.
Ethyleneimine; see 1910.1012 151-56-4
Ethylene oxide; see 1910.1047 75-21-8
Ethylidene chloride; see 1,1-Dichloroethane.
N-Ethylmorpholine 100-74-3 20 94 X
Ferbam 14484-64-1
Total dust 15
Ferrovanadium dust 12604-58-9 1
Fluorides (as F) (4) 2.5
Fluorine 7782-41-4 0.1 0.2
Fluorotrichloromethane (Trichlorofluoromethane) 75-69-4 1000 5600
Formaldehyde; see 1910.1048 50-00-0
Formic acid 64-18-6 5 9
Furfural 98-01-1 5 20 X
Furfuryl alcohol 98-00-0
50 200
Grain dust (oat, wheat, barley) 10
Glycerin (mist) 56-81-5
Total dust
15
Respirable fraction


5
Glycidol 556-52-5 50 150
Glycol monoethyl ether; see 2-Ethoxyethanol.
Graphite, natural, respirable dust 7782-42-5 (3)
Graphite, synthetic
Total dust
15
Respirable fraction
5
Guthion; see Azinphos methyl.
Gypsum 13397-24-5
Total dust
15
Respirable fraction
5
Hafnium 7440-58-6 0.5
Heptachlor 76-44-8 0.5 X
Heptane (n-Heptane) 142-82-5 500 2000
Hexachloroethane 67-72-1 1 10 X
Hexachloronaphthalene 1335-87-1 0.2 X
n-Hexane 110-54-3 500 1800
2-Hexanone (Methyl n-butyl ketone) 591-78-6 100 410
Hexone (Methyl isobutyl ketone) 108-10-1 100 410
sec-Hexyl acetate 108-84-9 50 300
Hydrazine 302-01-2 1 1.3 X
Hydrogen bromide 10035-10-6 3 10
Hydrogen chloride 7647-01-0 (C)5 (C)7
Hydrogen cyanide 74-90-8 10 11 X
Hydrogen fluoride (as F) 7664-39-3 (2)
Hydrogen peroxide 7722-84-1 1 1.4
Hydrogen selenide (as Se) 7783-07-5 0.05 0.2
Hydrogen sulfide 7783-06-4 (2)
Hydroquinone 123-31-9 2
Iodine 7553-56-2 (C)0.1 (C)1
Iron oxide fume 1309-37-1 10
Isoamyl acetate 123-92-2 100 525
Isoamyl alcohol (primary and secondary) 123-51-3 100 360
Isobutyl acetate 110-19-0 150 700
Isobutyl alcohol 78-83-1 100 300
Isophorone 78-59-1 25 140
Isopropyl acetate 108-21-4 250 950
Isopropyl alcohol 67-63-0 400 980
Isopropylamine 75-31-0 5 12
Isopropyl ether 108-20-3 500 2100
Isopropyl glycidyl ether (IGE) 4016-14-2 50 240
Kaolin 1332-58-7
Total dust
15
Respirable fraction
5
Ketene 463-51-4 0.5 0.9
Lead, inorganic (as Pb); see 1910.1025 7439-92-1
Limestone 1317-65-3
Total dust
15
Respirable fraction
5
Lindane 58-89-9 0.5 X
Lithium hydride 7580-67-8
0.025
L.P.G. (Liquefied petroleum gas) 68476-85-7 1000 1800
Magnesite 546-93-0
Total dust
15
Respirable fraction
5
Magnesium oxide fume 1309-48-4
Total particulate
15
Malathion 121-75-5
Total dust
15 X
Maleic anhydride 108-31-6 0.25 1
Manganese compounds (as Mn) 7439-96-5 (C)5
Manganese fume (as Mn) 7439-96-5 (C)5
Marble 1317-65-3
Total dust

15
Respirable fraction
5
Mercury (aryl and inorganic) (as Hg) 74739-97-5 (2)
Mercury (organo) alkyl compounds (as Hg) 74739-97-6 (2)
Mercury (vapor) (as Hg) 7439-97-6 (2)
Mesityl oxide 141-79-7
25 100
Methanethiol; see Methyl mercaptan.
Methoxychlor 72-43-5
Total dust
2-Methoxyethanol (Methyl cellosolve) 109-86-4 25 80 X
2-Methoxyethyl acetate (Methyl cellosolve acetate) 110-49-6 25 120 X
Methyl acetate 79-20-9 200 610
Methyl acetylene (Propyne) 74-99-7 1000 1650
Methyl acetylene-propadiene mixture (MAPP) 1000
1850
Methyl acrylate 96-33-3 10 35 X
Methylal (Dimethoxy-methane) 109-87-5 1000 3100
Methyl alcohol 67-56-1 200 260
Methylamine 74-89-5
10 12
Methyl amyl alcohol; see Methyl isobutyl carbinol.
Methyl n-amyl ketone 110-43-0 100 465
Methyl bromide 74-83-9 (C)20 (C)80
X
Methyl butyl ketone; see 2-Hexanone.
Methyl cellosolve; see 2-Methoxyethanol.
Methyl cellosolve acetate; see 2-Methoxyethyl acetate.
Methyl chloride 74-87-3 (2)
Methyl chloroform (1,1,1-Trichloroethane) 71-55-6 350 1900
Methylcyclohexane 108-87-2 500 2000
Methylcyclohexanol 25639-42-3 100 470
o-Methylcyclohexanone 583-60-8 100 460 X
Methylene chloride 75-09-2 (2)
Methyl ethyl ketone (MEK); see 2-Butanone.
Methyl formate 107-31-3 100 250
Methyl hydrazine (Monomethyl hydrazine) 60-34-4 (C)0.2 (C)0.35 X
Methyl iodide 74-88-4 5 28 X
Methyl isoamyl ketone 110-12-3 100 475
Methyl isobutyl carbinol 108-11-2 25 100 X
Methyl isobutyl ketone; see Hexone.
Methyl isocyanate 624-83-9 0.02 0.05 X
Methyl mercaptan 75-93-1 (C)10 (C)20
Methyl methacrylate 80-62-6 100 410
Methyl propyl ketone; see 2-Pentanone.
alpha-Methyl styrene 98-83-9 (C)100 (C)480
Methylene bisphenyl isocyanate (MDI) 101-68-8 (C)0.02 (C)0.02
Mica; see Silicates.
Molybdenum (as Mo) 7439-98-7
Soluble compounds
5
Insoluble compounds.
Total dust
15
Monomethyl aniline 100-61-8 2 9 X
Monomethyl hydrazine; see Methyl hydrazine.
Morpholine 110-91-8 20 70 X
Naphtha (Coal tar) 8030-30-6 100 400
Naphthalene 91-20-3
10
50
alpha-Naphthylamine; see 1910.1004 134-32-7
beta-Naphthylamine; see 1910.1009 91-59-8
Nickel carbonyl (as Ni) 13463-39-3 0.001 0.007
Nickel, metal and insoluble compounds (as Ni) 7440-02-0
1
Nickel, soluble compounds (as Ni) 7440-02-0 1
Nicotine 54-11-5 0.5 X
Nitric acid 7697-37-2 2 5
Nitric oxide 10102-43-9 25 30
p-Nitroaniline 100-01-6 1 6
X
Nitrobenzene 98-95-3 1 5 X
p-Nitrochlorobenzene 100-00-5 1 X
4-Nitrodiphenyl; see 1910.1003 92-93-3
Nitroethane 79-24-3 100 310
Nitrogen dioxide 10102-44-0 (C)5 (C)9
Nitrogen trifluoride 7783-54-2 10 29
Nitroglycerin 55-63-0 (C)0.2 (C)2
Nitromethane 75-52-5
100 250
1-Nitropropane 108-03-2 25 90
2-Nitropropane 79-46-9 25 90
N-Nitrosodimethylamine; see 1910.1016.
Nitrotoluene (all isomers)
5 30 X
o-isomer
88-72-2
m-isomer
99-08-1
p-isomer
99-99-0
Nitrotrichloromethane; see Chloropicrin.
Octachloronaphthalene 2234-13-1 0.1 X
Octane 111-65-9 500 2350
Oil mist, mineral 8012-95-1 5
Osmium tetroxide (as Os) 20816-12-0 0.002
Oxalic acid 144-62-7 1
Oxygen difluoride 7783-41-7 0.05 0.1
Ozone 10028-15-6 0.1 0.2
Paraquat, respirable dust 4685-14-7;
1910-42-5;
2074-50-02

0.5 X
Parathion 56-38-2
0.1 X
Particulates not otherwise regulated (PNOR)f.
Total dust
15
Respirable fraction
5
PCB; see Chlorodiphenyl (42% and 54% chlorine).
Pentaborane 19624-2-7 0.005 0.01
Pentachloronaphthalene0 1321-64-8 0.5 X
Pentachlorophenol 8786-5 0.5 X
Pentaerythritol 115-77-5
Total dust
15
Respirable fraction
5
Pentane 109-66-0 1000 2950
2-Pentanone (Methyl propyl ketone) 107-87-9 200 700
Perchloroethylene (Tetrachloroethylene) 127-18-4 (2)
Perchloromethyl mercaptan 594-42-3 0.1 0.8
Perchloryl fluoride 7616-94-6 3 13.5
Petroleum distillates (Naphtha) (Rubber Solvent) 500 2000
Phenol 108-95-2 5 19 X
p-Phenylene diamine 106-50-3 0.1 X
Phenyl ether, vapor 101-84-8 1 7
Phenyl ether-biphenyl mixture, vapor 1 7
Phenylethylene; see Styrene.
Phenyl glycidyl ether (PGE) 122-60-1 10 60
Phenylhydrazine 100-63-0 5 22 X
Phosdrin (Mevinphos) 7786-34-7 0.1 X
Phosgene (Carbonyl chloride) 75-44-5 0.1
0.4
Phosphine 7803-51-2 0.3 0.4
Phosphoric acid 7664-38-2 1
Phosphorus (yellow) 7723-14-0 0.1
Phosphorus pentachloride 10026-13-8 1
Phosphorus pentasulfide 1314-80-3 1
Phosphorus trichloride 7719-12-2 0.5 3
Phthalic anhydride 85-44-9 2 12
Picloram 1918-02-1
Total dust
15
Respirable fraction
5
Picric acid 88-89-1
0.1 X
Pindone (2-Pivalyl-1,3-indandione) 83-26-1
0.1
Plaster of Paris 26499-65-0
Total dust
15
Respirable fraction
5
Platinum (as Pt) 7440-06-4
Metal

Soluble salts
0.002
Portland cement 65997-15-1
Total dust
15
Respirable fraction
5
Propane 74-98-6 1000 1800
beta-Propriolactone; see 1910.1013 57-57-8
n-Propyl acetate 109-60-4 200 840
n-Propyl alcohol 71-23-8 200 50
n-Propyl nitrate 627-13-4 25 110
Propylene dichloride 78-87-5 75 350
Propylene imine 75-55-8 2 5 X
Propylene oxide 75-56-9 100 240
Propyne; see Methyl acetylene.
Pyrethrum 8003-34-7 5
Pyridine 110-86-1 5 15
Quinone 106-51-4 0.1 0.4
RDX; see Cyclonite.
Rhodium (as Rh), metal fume and insoluble compounds 7440-16-6 0.1
Rhodium (as Rh), soluble compounds 7440-16-6 0.001
Ronnel 299-84-3 15
Rotenone 83-79-4

5
Rouge
Total dust
15
Respirable fraction
5
Selenium compounds (as Se) 7782-49-2 0.2
Selenium hexafluoride (as Se) 7783-79-1 0.05 0.4
Silica, amorphous, precipitated and gel 112926-00-8 (3)
Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica 61790-53-2 (3)
Silica, crystalline, respirable dust
Cristobalite; see 1910.1053 7
14464-46-1
Quartz; see 1910.1053 7
14808-60-7
Tripoli (as quartz); see 1910.1053 7
1317-95-9
Tridymite; see 1910.1053 7
15468-32-3
Silica, fused, respirable dust 60676-86-0 (3)
Silicates (less than 1% crystalline silica)
Mica (respirable dust)
12001-26-2 (3)
Soapstone, total dust
(3)
Soapstone, respirable dust
(3)
Talc (containing asbestos); use asbestos limit; see 29 CFR 1910.1001
(3)
Talc (containing no asbestos), respirable dust
14807-96-6 (3)
Tremolite, asbestiform; see 1910.1001.
Silicon 7440-21-3
Total dust
15
Respirable fraction
5
Silicon carbide 409-21-2
Total dust
15
Respirable fraction
5
Silver, metal and soluble compounds (as Ag) 7440-22-4 0.01
Soapstone; see Silicates.
Sodium fluoroacetate 62-74-8 0.05 X
Sodium hydroxide 1310-73-2 2
Starch 9005-25-8
Total dust
15
Respirable fraction
5
Stibine 7803-52-3 0.1 0.5
Stoddard solvent 8052-41-3 500 2900
Strychnine 57-24-9 0.15
Styrene 100-42-5 (2)
Sucrose 57-50-1
Total dust
15
Respirable fraction
5
Sulfur dioxide 7446-09-5 5
13
Sulfur hexafluoride 2551-62-4 1000 6000
Sulfuric acid 7664-93-9 1
Sulfur monochloride 10025-67-9 1 6
Sulfur pentafluoride 5714-22-7 0.025 0.25
Sulfuryl fluoride 2699-79-8 5 20
Systox; see Demeton.
2,4,5-T (2,4,5-trichlorophenoxyacetic acid) 93-76-5 10
Talc; see Silicates.
Tantalum, metal and oxide dust 7440-25-7 5
TEDP (Sulfotep) 3689-24-5 0.2 X
Tellurium and compounds (as Te) 13494-80-9 0.1
Tellurium hexafluoride (as Te) 7783-80-4 0.02 0.2
Temephos 3383-96-8
Total dust
15
Respirable fraction
5
TEPP (Tetraethyl pyrophosphate) 107-49-3 0.005 X
Terphenyls 26140-60-3 (C)1 (C)9
1,1,1,2-Tetrachloro-2,2-difluoroethane 76-11-9 500 4170
1,1,2,2-Tetrachloro-1,2-difluoroethane 76-12-0 50 4170
1,1,2,2-Tetrachloroethane 79-34-5 5 35 X
Tetrachloroethylene; see Perchloroethylene.
Tetrachloromethane; see Carbon tetrachloride.
Tetrachloronaphthalene 1335-88-2
2
X
Tetraethyl lead (as Pb) 78-00-2 0.075 X
Tetrahydrofuran 109-99-9 200 590
Tetramethyl lead (as Pb) 75-74-1 0.075 X
Tetramethyl succinonitrile 3333-52-6 0.5 3 X
Tetranitromethane 509-14-8 1 8
Tetryl (2,4,6-Trinitrophenylmethylnitramine) 479-45-8 1.5 X
Thallium, soluble compounds (as Tl) 7440-28-0
0.1 X
4,4'-Thiobis (6-tert, Butyl-m-cresol) 96-69-5
Total dust
15
Respirable fraction
5
Thiram 137-26-8 5
Tin, inorganic compounds (except oxides) (as Sn) 7440-31-5 2
Tin, organic compounds (as Sn) 7440-31-5 0.1
Titanium dioxide 13463-67-7
Total dust
15
Toluene 108-88-3 (2)
Toluene-2,4-diisocyanate (TDI) 584-84-9 (C)0.02 (C)0.14
o-Toluidine 95-53-4 5 22 X
Toxaphene; see Chlorinated camphene.
Tremolite; see Silicates.
Tributyl phosphate 126-73-8
5
1,1,1-Trichloroethane; see Methyl chloroform.
1,1,2-Trichloroethane 79-00-5 10 45 X
Trichloroethylene 79-01-6 (2)
Trichloromethane; see Chloroform.
Trichloronaphthalene 1321-65-9 5 X
1,2,3-Trichloropropane 96-18-4 50 300
1,1,2-Trichloro-1,2,2-trifluoroethane 76-13-1 1000 7600
Triethylamine 121-44-8 25 100
Trifluorobromomethane 75-63-8 1000 6100
2,4,6-Trinitrophenol; see Picric acid.
2,4,6-Trinitrophenylmethylnitramine; see Tetryl.
2,4,6-Trinitrotoluene (TNT) 118-96-7
1.5 X
Triorthocresyl phosphate 78-30-8 0.1
Triphenyl phosphate 115-86-6 3
Turpentine 8006-64-2 100 560
Uranium (as U) 7440-61-1
Soluble compounds
0.05
Insoluble compounds
0.25
Vanadium 1314-62-1
Respirable dust (as V2 O5)
(C)0.5
Fume (as V2 O5)
(C)0.1
Vegetable oil mist
Total dust
15
Respirable fraction
5
Vinyl benzene; see Styrene.
Vinyl chloride; see 1910.1017 75-01-4
Vinyl cyanide; see Acrylonitrile.
Vinyl toluene 25013-15-4 100 480
Warfarin 81-81-2 0.1
Xylenes (o-, m-, p-isomers) 1330-20-7 100 435
Xylidine 1300-73-8 5 25 X
Yttrium 7440-65-5 1
Zinc chloride fume 7646-85-7 1
Zinc oxide fume 1314-13-2
5
Zinc oxide 1314-13-2
Total dust
15
Respirable fraction
5
Zinc stearate 557-05-1
Total dust
15
Respirable fraction
5
Zirconium compounds (as Zr) 7440-67-7 5


1 The PELs are 8-hour TWAs unless otherwise noted; a (C) designation denotes a ceiling limit. They are to be determined from breathing-zone air samples.
  1. Parts of vapor or gas per million parts of contaminated air by volume at 25 °C and 760 torr.
  2. Milligrams of substance per cubic meter of air. When entry is in this column only, the value is exact; when listed with a ppm entry, it is approximate.
  3. The CAS number is for information only. Enforcement is based on the substance name. For an entry covering more than one metal compound, measured as the metal, the CAS number for the metal is given-not CAS numbers for the individual compounds.
  4. The final benzene standard in 1910.1028 applies to all occupational exposures to benzene except in some circumstances the distribution and sale of fuels, sealed containers and pipelines, coke production, oil and gas drilling and production, natural gas processing, and the percentage exclusion for liquid mixtures; for the excepted subsegments, the benzene limits in Table Z-2 apply. See 1910.1028 for specific circumstances.
  5. This 8-hour TWA applies to respirable dust as measured by a vertical elutriator cotton dust sampler or equivalent instrument. The timeweighted average applies to the cottom waste processing operations of waste recycling (sorting, blending, cleaning and willowing) and garnetting. See also 1910.1043 for cotton dust limits applicable to other sectors.
  6. All inert or nuisance dusts, whether mineral, inorganic, or organic, not listed specifically by substance name are covered by the Particulates Not Otherwise Regulated (PNOR) limit which is the same as the inert or nuisance dust limit of Table Z-3.
2 See Table Z-2.

3 See Table Z-3.

4 Varies with compound.

5 See Table Z-2 for the exposure limit for any operations or sectors where the exposure limit in §1910.1026 is stayed or is otherwise not in effect.

6 If the exposure limit in §1910.1026 is stayed or is otherwise not in effect, the exposure limit is a ceiling of 0.1 mg/m3.

7 See Table Z-3 for the exposure limit for any operations or sectors where the exposure limit in § 1910.1053 is stayed or is otherwise not in effect.

8 See Table Z-2 for the exposure limits for any operations or sectors where the exposure limits in § 1910.1024 are stayed or otherwise not in effect.


[54 FR 36767, Sept. 5, 1989; 54 FR 41244, Oct. 6, 1989; 55 FR 3724, Feb. 5, 1990; 55 FR 12819, Apr 6, 1990; 55 FR 19259, May 9, 1990; 55 FR 46950, Nov. 8, 1990; 57 FR 29204, July 1, 1992; 57 FR 42388, Sept. 14, 1992; 58 FR 35340, June 30, 1993; 61 FR 56746, Nov. 4, 1996; 62 FR 42018, August 4, 1997; 71 FR 10373, Feb. 28, 2006; 81 FR 16861, March 25, 2016; 82 FR 2735, Jan. 9, 2017]

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