Right To Know Policy

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Right to Know Policy: Appendices

Table Z-1 Limits For Air Contaminants

NOTE: Because of the length of the table, explanatory Footnotes applicable to all substances are given below as well as at the end of the table. Footnotes specific only to a limited number of substances are also shown within the table.

  1. Footnote(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. Footnote(a) Parts of vapor or gas per million parts of contaminated air by volume at 25 degrees C and 760 torr.
    2. Footnote(b) 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. Footnote(c) 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. Footnote(d) 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. Footnote(e) This 8-hour TWA applies to respirable dust as measured by a vertical elutriator cotton dust sampler or equivalent instrument. The time-weighted average applies to the cotton 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. Footnote(f) 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. Footnote(2) See Table Z-2.
  3. Footnote(3) See Table Z-3.
  4. Footnote(4) Varies with compound.

Table Z-1. - Limits for Air Contaminants
Substance CAS No. (c) ppm (a)(1) mg/m(3)(b)(1) Skin designation
Acetaldehyde 75-07-0 200    
Acetic acid 64-19-7 10 360  
Acetic anhydride 108-24-7 5 25  
Acetone 67-64-1 1000 20  
Acetonitrile 75-05-8 40 2400  
2-Acetylaminofluorene; see 1910.1014 53-96-3   70  
Acetylene dichloride; see 1,2-Dichloroethylene        
Acetylene tetrabromide 79-27-6 1    
Acrolein 107-02-8 0.1 14  
Acrylamide 79-06-1   0.25  
Acrylonitrile; see 1910.1045 107-13-1   0.3 X
Aldrin 309-00-2      
Allyl alcohol 107-18-6 2 0.25 X
Allyl chloride 107-05-1 1 5 X
Allyl glycidyl ether (AGE) 106-92-3 (C)10 3  
Allyl propyl disulfide 2179-59-1 2 (C)45  
alpha-Alumina 1344-28-1   Total dust: 12
Respirable fraction: 15		  
Aluminum Metal (as Al) 7429-90-5   Total dust: 5
Respirable fraction: 15		  
4-Aminodiphenyl; see 1910.1011 92-67-1   5  
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); 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.See Table Z-2 for the limits applicable in the operations or sectors excluded in 1910.1028 (d) 71-43-2      
Benzidine; See 1910.1010 92-87-5      
p-Benzoquinone; see Quinone        
Benzo(a)pyrene; seeCoal tar pitch volatiles        
Benzoyl peroxide 94-36-0   5  
Benzyl chloride 100-44-7 1 5  
Beryllium and beryllium compounds (as Be) 7440-41-7   (2)  
Biphenyl; see Diphenyl        
Bismuth telluride, Undoped 1304-82-1   Total dust: 15
Respirable fraction: 5		  
Boron oxide 1303-86-2   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; 106-99-0 1 ppm/5    
29 CFR 1910.19(1)   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 X
tert-Butyl chromate (as CrO(3)) 1189-85-1   (C)0.1 X
n-Butyl glycidyl ether 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 fraction5		  
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		  
Chromic acid and chromates (as CrO(3)) (4)   (2)  
Chromium (II) compounds 7440-47-3   0.5  
Chromium (III) compounds (as Cr) 7440-47-3   0.5  
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% SiO(2)),     Respirable fraction: (3)  
Coal dust (greater than SiO(2))     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 dust (e), 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 110-83-8 300 1015  
Cyclopentadiene 542-92-7 75 200  
2,4-D (Dichlorophen-oxyacetic 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  
3,3'-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  
Dichlorodiphenyltri-chloroethane (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        
Dichloromonofluoro-methane 75-43-4 1000 4200  
1,1-Dichloro-1-nitroethane 594-72-9 (C)10 (C)60  
1,2-Dichloropropane; see Propylene dichloride        
Dichlorotetrafluoro-ethane 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-Dimethylaminoazo-benzene; 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-dichloroethylphosphate 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
Dinitrobenzene (ortho) 528-29-0      
Dinitrobenzene (meta) 99-65-0      
Dinitrobenzene (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. 34590-94-8 100 600 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 glycol dinitrate 628-96-6 (C)0.2 (C)1 X
Ethylene glycol methyl acetate; see Methylcellosolve acetate        
Ethyleneimine; see 1910.1012 151-56-4      
Ethylene oxide; see 1910.1047 75-21-8      
Ethylidene chloride; see 1,1-Dichlorethane        
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 (Trichloro-fluoromethane) 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 7782-42-5   Respirable dust: (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  
Isomyl acetate 123-92-2 100 525  
Isomyl 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. (Liquified 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) 7439-97-6   (2)  
Mercury (organo) alkyl compounds (as Hg) 7439-97-6   (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: 15  
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 1800  
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 Isobutylcarbinol        
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 cellosolveacetate; see 2-Methoxyethyl acetate        
Methyl chloride 74-87-3   (2)  
Methyl chloroform (1,1,1-Trichloro-ethane) 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-ButanoneMethyl 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 74-93-1 (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)0.2  
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 andinsoluble 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 X
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
Nitrotoluene o-isomer 88-72-2      
Nitrotoluene m-isomer 99-08-1      
Nitrotoluene p-isomer 99-99-0      
Nitrotrichloromethane; see Chloropicrin        
Octachloronaphthalene 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 4685-14-7
1910-42-5
2074-50-2		   Respirable dust: 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 19624-22-7 0.005 0.01  
Pentachloronaphthalene 1321-64-8   0.5 X
Pentachlorophenol 87-86-5   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 71-23-8 200 500  
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 cristobalite 14464-46-1   Respirable dust: (3)  
Silica, crystalline quartz 14808-60-7   Respirable dust: (3)  
Silica, crystalline tripoli (as quartz) 1317-95-9   Respirable dust: (3)  
Silica, crystalline tridymite 15468-32-3   Respirable dust: (3)  
Silica, fused 60676-86-0   Respirable dust: (3)  
Silicates (less than 1% crystalline silica) Mica 12001-26-2   Respirable dust: (3)  
Soapstone     Total dust: (3)
Respirable dust: (3)		  
Talc (containing asbestos): use asbestos limit: see 29 CFR 1910.1001.     (3)  
Talc (containing no asbestos) 14807-96-6   Respirable dust: (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 andsoluble 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-tri-chlorophenoxyaceticacid) 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 pyrophosphaate) 107-49-3   0.05 X
Terphenylis 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 76-12-0 500 4170  
1,1,2,2-Tetrachloro- ethane 79-34-5 5 35 X
Tetrachoroethylene;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-Trinitro-phenylmethyl-nitramine) 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 (exceptoxides) (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-Trinitrophenyl-methyl nitramine;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 V(2)O(5)): (C)0.5
Fume (as V(2)O(5)): (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. Footnote(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. Footnote(a) Parts of vapor or gas per million parts of contaminated air by volume at 25 degrees C and 760 torr.
    2. Footnote(b) 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. Footnote(c) 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. Footnote(d) 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. Footnote(e) This 8-hour TWA applies to respirable dust as measured by a vertical elutriator cotton dust sampler or equivalent instrument. The time-weighted average applies to the cotton 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. Footnote(f) 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. Footnote(2) See Table Z-2.
  3. Footnote(3) See Table Z-3.

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Table Z-2, 8 Hour Shift Exposure Limits
Substance 8-hour time weighted average Acceptable ceiling concentration Acceptable maximum peak above the acceptable ceiling concentration for an 8-hr shift Maximum duration
  1. Footnote(a) This standard applies to the industry segments exempt from the 1 ppm 8-hour TWA and 5 ppm STEL of the benzene standard at 1910.1028.2.
  2. Footnote(b) This standard applies to any operations or sectors for which the Cadmium standard, 1910.1027, is stayed or otherwise not ineffect.
Benzene(a) (Z37.40-1969) 10 ppm 25 ppm 50 ppm 10 minutes
Beryllium and beryllium compounds (Z37.29-1970) 2 ug/m(3) 5 ug/m(3) 25 ug/m(3) 30 minutes
Cadmium fume(b) (Z37.5-1970) 0.1 mg/m(3) 0.3 mg/m(3)    
Cadmium dust(b) (Z37.5-1970) 0.2 mg/m(3) 0.6 mg/m(3)    
Carbon disulfide (Z37.3-1968) 20 ppm 30 ppm 100 ppm 30 minutes
Carbon tetrachloride 10 ppm 25 ppm 200 ppm 5 min. in any 4 hours
Chromic acid andchromates (Z37-7-1971)   1 mg/10 m(3)    
Ethylene dibromide (Z37.31-1970) 20 ppm 30 ppm 50 ppm 5 minutes
Ethylene dichloride (Z37.21-1969) 50 ppm 100 ppm 200 ppm 5 minutes in any 3 hours
Fluoride as dust (Z37.28-1969) 2.5 mg/m(3)      
Formaldehyde: see 1910.1048        
Hydrogen fluoride (Z37.28-1969) 3 ppm      
Hydrogen sulfide (Z37.2-1966)   20 ppm 50 ppm 10 minutes once only if no other measured exposure occurs
Mercury (Z37.8-1971)   1 mg/10m(3)    
Methylene chloride (Z37.18-1969)        
Methylene Chloride: see 1910.1052        
Organo (alkyl) mercury (Z37.30-1969) 0.01mg/m(3) 0.04 mg/m(3)    
Styrene (Z37.15-1969) 100 ppm 200 ppm 600 ppm 5 minutes in any 3 hours
Tetrachloroethylene (Z37.22-1967) 100 ppm 200 ppm 300 ppm 5 minutes in any 3 hours
Toluene (Z37.12-1967) 200 ppm 300 ppm 500 ppm 10 minutes
Trichloroethylene (Z37.19-1967) 100 ppm 200 ppm 300 ppm 5 minutes in any 2 hours

[54 FR 2920, Jan. 19. 1989, 54 FR 28059, July 5, 1989, as amended at 54 FR 36767, Sept. 5, 1989; 54 FR 47513, Nov. 15, 1989; 54 FR 50372, Dec. 6, 1989; 55 FR 19259, May 9, 1990; 55 FR 46950, Nov. 8, 1990; 57 FR 29205, July 1, 1992; 58 FR 35340, June 30, 1993; 58 FR 40191, July 27, 1993; 62 FR 1493, Jan. 10, 1997; 62 FR 42018, August 4, 1997

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Table Z-3. - Mineral Dusts
Substance mppcf(a) mg/m3

*Note - Conversion factors mppcf x 35.3 = million particles per cubic meter = particles per c.c.

  1. Footnote(a) Millions of particles per cubic foot of air, based on impinger samples counted by light-field techniques.
  2. Footnote(b) The percentage of cristalline silica in the formula is the amount determined from airborn, samples except in those instances in which other methods have been shown to be applicable.
  3. Footnote(c) Containing less than 1% quartz; if 1% quartz or more, use quartz limit.
  4. Footnote(d) All inert or nuisance dusts, whether mineral, inorganic, or organic, not listed specifically by substance name are covered by this limit, which is the same as the Particulates Not Otherwise Regulated (PNOR) limit in Table Z-1.
  5. Footnote(e) Both concentration and percent quartz for the application of this limit are to be determined from the fraction passing a size-selector with the following characteristics:
Aerodynamics Diameter % passing selector
2 90
2.5 75
3.5 50
5.0 25
10 0
Silica - Cristalline:
Quartz (Respirable) 250(b) / %SiO2 + 5 10mg/m3(c) / %SiO2 + 2
Quartz (Total Dust) ... 30mg/m3 / %SiO2 + 2
Cristobalite: use 1/2 the value calculated from the count or mass formulae for quartz.    
Tridymite: use 1/2 the value calculated from the formulae for quartz.    
Silica: Amorphous, including natural diatomaceous earth 20 80mg/m3 / %SiO2
Silicates (less than 1% cristalline silica):
Mica 20  
Soapstone 20  
Talc (not containing asbestos) 209  
Talc (containing asbestos): Use asbestos limit.    
Tremolite, asbestiform (see 29 CFR 1910.1001).    
Portland Cement 50  
Graphite (natural) 15  
Coal Dust
Respirable fraction less than 5% Sio2   2.4mg/m3(d)
Respirable fraction greater than 5% Sio2   10mg/m3(e) / %SiO2 + 2
Inert or Nuisance Dust
Respirable fraction 15 5mg/m3
Total Dust 50 15mg/m3

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Contact Information

Cathleen Eldridge, Associate Director
Office: Sibley Hall 421
Phone: (518) 564-5009
Fax: (518) 564-5082
Email: eldridcm@plattsburgh.edu