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TABLE AC-1 (printable .pdf file 611K)
PERMISSIBLE EXPOSURE LIMITS FOR CHEMICAL CONTAMINANTS

Chemical
Abstracts
Registry
Number (a) 		Skin(b) Name(c) PEL (d)
   STEL (o)
ppm(e) mg/M3(f) Ceiling(g) ppm(e) mg/M3(f)
75070   Acetaldehyde 25 45 C    
64197   Acetic acid 10 25 40 ppm 15 37
108247   Acetic Anhydride 5 20 C    
67641   Acetone 500 1200 3000 ppm 750 1780
75868   Acetone cyanohydrin as CN 4.7 5 C    
75058 S Acetonitrile 40 70   60 105
98862   Acetophenone 10 49      
53963 S 2-Acetylaminofluorene; N-fluoren-2-yl acetamide;          
    see Section 5209          
74862   Acetylene (h)        
540590   Acetylene dichloride; see 1,2-Dichloroethylene          
79276   Acetylene tetrabromide:1,1,2,2-tetrabromoethane 1 14      
79345   Acetylene tetrachloride; see 1,1,2,2-          
    Tetrachloroethane          
50782   Acetylsalicylic acid (Aspirin)   5      
107028 S Acrolein 0.1 0.25 C    
79061 S Acrylamide -- 0.03      
79107 S Acrylic acid 2 5.9      
107131 S Acrylonitrile; see Section 5213 2 4.5      
124049   Adipic acid -- 5      
111693 S Adiponitrile 2 8.8      
309002 S Aldrin; 1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-          
    hexahydro-endo-1,2-exo-5,8-          
    dimethanonaphthalene -- 0.25      
107186 S Allyl alcohol 0.5 1.25   4 10
107051   Allyl chloride 1 3   2 6
106923 S Allyl glycidyl ether; AGE 0.2 0.93      
2179591   Allyl propyl disulfide 2 12   3 18
1344281   Alumina; see Particulates not otherwise regulated          
    Aluminum, alkyls (not otherwise classified) -- 2      
    Aluminum soluble salts -- 2      
    Aluminum metal and oxide --        
    Total dust -- 10      
    Respirable fraction(n) -- 5(n)      
    Aluminum pyro powders -- 5      
    Aluminum welding fumes -- 5      
300925   Aluminum distearate -- 10      
7047849   Aluminum stearate -- 10      
637127   Aluminum tristearate -- 10      
1300738   Aminodimethylbenzene; see Xylidene          
92671 S 4-Aminodiphenyl; see Section 5209          
141435   2-Aminoethanol; see Ethanolamine          
91598   2-Aminonapthalene; see beta-Naphthylamine,          
    Section 5209          
504290   2-Aminopyridine 0.5 2      
61825   Amitrole -- 0.2      
7664417   Ammonia 25 18   35 27
3825261 S Ammonium perfluorooctanoate -- 00.1      
12125029   Ammonium chloride fume -- 10   -- 20
1002897   Ammonium stearate -- 10      
7773060   Ammonium sulfamate --        
    Total dust -- 10      
    Respirable fraction(n) -- 5      
620111   3-Amyl acetate; See Pentyl acetate          
628637   n-Amyl acetate; See Pentyl acetate          
626380   sec-Amyl acetate (all isomers and mixtures); See Pentyl acetate          
625161   tert-Amyl acetate; See Pentyl acetate        
62533 S Aniline 2 7.6      
29191524 S Anisidine (ortho and para isomers) 0.1 0.5      
    Antimony and compounds, as Sb -- 0.5      
86884   ANTU; 1-(1-naphthyl)-2-thiourea; Bantu; Rattrack -- 0.3      
7440371   Argon (h)        
7440382   Arsenic and inorganic arsenic compounds; see also   0.01      
    Section 5214          
    Arsenic, organic compounds, as As -- 0.2      
7784421   Arsine; AsH3 0.05 0.2      
1332-21-4   Asbestos (including actinolite, amosite          
    anthophyllite, chrysotile, crocidolite, and tremolite);          
    see Section 5208          
8052424   Asphalt (petroleum) fumes -- 5      
1912249   Atrazine -- 5      
86500 S Azinphos methyl; o,o-dimethyl S-(4-oxo-1,2,3- -- 0.2      
    benzotriazin-3(4H)-ylmethyl) phosphorodithioate          
3333526 S 2,2'-Azobisisobutyronitrile decomposition product,          
    see Tetramethyl succinonitrile          
7440393   Barium, soluble compounds, as Ba -- 0.5      
7727437   Barium sulfate; see Particulates not otherwise regulated          
17804352   Benomyl          
    Total dust -- 10      
    Respirable fraction(n) -- 5      
71432 S Benzene; see also Section 5218 1     5 --
92875 S Benzidine; 4,4'-diaminobiphenyl, see Section 5209          
71432   Benzol; see Benzene          
106514   D-Benzoquinone; see Quinone          
98884   Benzoyl chloride 0.2 1.1 C    
94360   Benzoyl peroxide; dibenzoyl peroxide -- 5      
140114   Benzyl acetate 10 61      
100447   benzyl chloride; alpha-chlorotoluene 0.03 0.16      
7440417   Beryllium, and beryllium compounds as Be
(see also Sections 1535.1, 5205 and 8359.1)		 -- 0.0002 0.025mg/M3 -- 0.002
92524   Biphenyl; diphenyl; phenylbenzene 0.2 1.5      
542881   Bis(chloromethyl) ether, see bis-Chloromethyl ether,          
    Section 5209          
3033623 S Bis (Dimethylaminoethyl) ether (DMAEE) 0.05 0.328   0.15 0.983
1304821   Bismuth telluride          
    Total dust -- 10      
    Respirable fraction(n) -- 5      
    Bismuth telluride (selenium-doped) -- 5      
    Borates, tetra, sodium salts          
    Anhydrous -- 5      
    Decahydrate -- 5      
    Pentahydrate -- 5      
1303862   Boron oxide -- 10      
10294334   Boron tribromide 1 10 C    
7637072   Boron trifluoride 1 3 C    
314409   Bromacil 1 10      
7726956   Bromine 0.1 0.7 C    
7789302   Bromine pentafluoride 0.1 0.7      
74975   Bromochloromethane; see Chlorobromethane          
74964   Bromoethane; see Ethyl bromide          
75252 S Bromoform; tribromomethane 0.5 5      
74839   Bromomethane, see Methyl bromide          
106945 S 1-bromopropane, n-propyl bromide 5 25      
75638   Bromotrifluoromethane; see Trifluorobromomethane          
106990   1,3-Butadiene (see also section 5201) 1 2.2   5 11
106978   Butane 800 1,900      
109795   1-Butanethiol; see Butyl mercaptan          
71363   1-Butanol; see n-Butyl alcohol          
78933   2-Butanone; see Methyl ethyl ketone          
111762 S 2-Butoxyethanol (EGBE) 20 97      
123864   n-Butyl acetate 150 710   200 950
105464   sec-Butyl acetate 200 950      
540885   tert-Butyl acetate 200 950      
141322   Butyl acrylate 2 11      
71363 S n-Butyl alcohol; 1-butanol 50 150 C    
78922   sec-Butyl alcohol 100 305      
75650   tert-Butyl alcohol 100 300   150 450
109739 S Butylamine 5 15 C    
1189851 S tert-Butyl chromate; di-tert-butyl          
    chromate, as CrO3 -- 0.1 C    
                     as Cr   0.005      
      (see also Sections 1532.2, 5206 & 8359)          
2426086   n-Butyl glycidyl ether; BGE; 25 135      
    1-butoxy-2,3-epoxypropane          
138227   n-Butyl lactate 5 25      
109795   n-Butyl mercaptan 0.5 1.5      
89725 S o-sec-Butylphenol 5 30      
98511   p-tert-Butyltoluene 1 6.1   20 120
7440439   Cadmium metal dust, as Cd          
    (see also Sections 1532 & 5207) -- 0.005      
    Cadmium, soluble salts, as Cd          
    (see also Sections 1532 & 5207) -- 0.005      
1306190   Cadmium oxide fume, as Cd          
    (see also Sections 1532 & 5207 ) -- 0.005      
7778441   Calcium arsenate; see Arsenic,inorganic (see          
    also Section 5214)          
471341   Calcium carbonate; see Particulates not otherwise regulated   --      
156627   Calcium cyanamide -- 0.5      
1305620   Calcium hydroxide -- 5      
1305788   Calcium oxide -- 2      
    Calcium silicate; see Particulates not otherwise regulated          
1344952   Calcium silicate (synthetic): see Particulates not otherwise regulated          
1592230   Calcium stearate -- 10      
7778189   Calcium sulfate; see Particulates not otherwise regulated          
76222   Camphor (synthetic) -- 2      
105602   Caprolactam dust -- 1   -- 3
105602   Caprolactam vapor 5 20   10 40
2425061 S Captafol -- 0.1      
133062   Captan -- 5      
63252   Carbaryl; 1-naphthyl N-methylcarbamate -- 5      
1563662   Carbofuran -- 0.1      
1333864   Carbon black -- 3.5      
124389   Carbon dioxide 5,000 9,000   30,000 54,000
75150 S Carbon disulfide 1 3 30 ppm 12 36
630080   Carbon monoxide 25 29 200 ppm    
558134   Carbon tetrabromide 0.1 1.4   0.3 4
56235 S Carbon tetrachloride 2 12.6 200 ppm 10 63
75445   Carbonyl chloride; see Phosgene          
353504   Carbonyl fluoride 2 5   5 15
120809 S Catechol; pyrocatechol 5 20      
9004346   Cellulose (paper fiber); see Particulates not otherwise regulated          
21351791   Cesium hydroxide   2      
57749 S Chlordane; 1,2,4,5,6,7,8,8-octachloro-3a,4,7,7a- -- 0.5      
    tetrahydro-4,7-methanoindane          
8001352 S Chlorinated camphene; toxaphene -- 0.5   -- 1
    Chlorinated diphenyl oxide -- 0.5      
7782505   Chlorine 0.5 1.5   1 3
10049044   Chlorine dioxide 0.1 0.3   0.3 0.9
7790912   Chlorine trifluoride 0.1 0.4 C    
107200   Chloroacetaldehyde 1 3 C    
78955 S Chloroacetone 1 3.8 C    
532274   alpha-Chloroacetophenone;phenacyl chloride 0.05 0.3      
79049 S Chloroacetyl chloride 0.05 0.2   0.15 0.69
108907   Chlorobenzene; monochlorobenzene 10 46      
2698411 S o-Chlorobenzylidene malononitrile; OCBM 0.05 0.4 C    
74975   Chlorobromomethane; bromochloromethane 200 1,050      
126998 S 2-Chloro-1,3-butadiene; see Chloroprene          
75456   Chlorodifluoromethane; Fluorocarbon 22 1,000 3,500      
53469219 S Chlorodiphenyl (42% chlorine) -- 1      
11097691 S Chlorodiphenyl (54% chlorine) -- 0.5      
106898   1-Chloro-2,3-epoxypropane; see Epichlorohydrin          
75003   Chloroethane; see Ethyl chloride          
107073   2-Chloroethanol; see Ethylene chlorohydrin          
75014   Chloroethylene, see Vinyl chloride, Section 5210          
67663   Chloroform; trichloromethane 2 9.78      
74873   Chloromethane, see Methyl chloride          
107302   Chloromethyl methyl ether; see Methyl          
    chloromethyl ether, Section 5209          
542881   bis-Chloromethyl ether, see also Section 5209 0.001 0.005      
100005   1-Chloro-4-nitrobenzene; see          
    p-Nitrochlorobenzene          
600259   1-Chloro-1-nitropropane 2 10      
76153   Chloropentafluoroethane 1,000 6,320      
76062   Chloropicrin; trichloronitromethane 0.1 0.7      
126998 S Chloroprene; 2-chloro-1,3-butadiene 10 36      
598787 S 2-Chloropropionic acid 0.1 0.44      
2039874   o-Chlorostyrene 50 285   75 428
95498 S o-Chlorotoluene 50 250      
1929824   2-Chloro-6-(trichloromethyl)pyridine; see Nitrapyrin          
2921882 S Chlorpyrifos -- 0.2      
    Chromite ore processing (chromate), as Cr -- 0.005      
  (see also Sections 1532.2, 5206 & 8359)          
7440473   Chromium metal -- 0.5      
    Chromium (II) compounds, as Cr -- 0.5      
    Chromium (III) compounds, as Cr -- 0.5      
    Chromium (VI) compounds, as Cr -- 0.005 0.1mg/M3    
  (see also Sections 1532.2, 5206 & 8359)          
14977618   Chromyl chloride 0.025 0.15      
2971906   Clopidol --        
    Total dust -- 10      
      Respirable fraction -- 5      
    Coal (Bituminous) dust          
    <5% quartz, respirable fraction(n) -- 0.9      
    >5% quartz, respirable fraction(n) -- 0.1      
    Coal tar pitch volatiles(i) -- 0.2      
7440484   Cobalt, metal fume and dust, as Co -- 0.020      
    Cobalt carbonyl, as Co -- 0.1      
16842038   Cobalt hydrocarbonyl, as Co -- 0.1      
    Coke oven emissions, see Section 5211   0.15      
7440508   Copper metal fume, as Cu -- 0.1      
    Copper salts, dusts and mists, as Cu -- 1      
    Corundum, see Particulates not otherwise regulated          
    Cotton dust, see also Section 5190 -- 1(j)      
1319773 S Cresol (all isomers) 5 22      
123739 S Crotonaldehyde; beta-methylacrolein     0.3    
4170303              
299865   Crufomate -- 5      
98828 S Cumene; isopropylbenzene 50 245      
420042   Cyanamide -- 2      
  S Cyanide, as CN -- 5      
460195   Cyanogen 10 20      
506774   Cyanogen chloride 0.3 0.6 C    
110827   Cyclohexane 300 1,050      
108930 S Cyclohexanol 50 200      
108941 S Cyclohexanone 25 100      
110838   Cyclohexene 300 1,015      
108918 S Cyclohexylamine 10 40      
121824 S Cyclonite; RDX; cyclotrimethylenetrinitramine -- 0.07      
542927   Cyclopentadiene 75 200      
287923   Cyclopentane 600 1,720      
13121705   Cyhexatin; tricyclohexyltin hydroxide   5      
94757   2,4-D;2,4-dichlorophenoxyacetic acid -- 10      
50293 S DDT; 1,1,1-trichloro-2,2-bis-          
    (p-chlorophenyl)ethane -- 1      
62737   DDVP, see Dichlorvos          
17702419 S Decaborane 0.05 0.3   0.15 0.9
8065483 S Demeton; a mixture of o,o-diethyl          
    o-2(ethylthio)ethyl phosphorothloate and          
    o,o'-diethyl S-2(ethylthio)ethyl phosphorothioate 0.01 0.1      
123422   Diacetone alcohol; 4-hydroxy-4-methyl-          
    2-pentanone 50 240      
107153   1,2-Diaminoethane; see Ethylenediamine          
    Diatomacous earth; see Silica-amorphous          
333415 S Diazinon; o,o-diethyl o-(2-isopropyl-6- -- 0.1      
    methyl-4-pyrimidinyl) phosphorothioate          
334883   Diazomethane 0.2 0.4      
94360   Dibenzoyl peroxide; see Benzoyl peroxide          
19287457   Diborane 0.1 0.1      
2528361 S Dibutyl phenyl phosphate 0.3 3.5      
96128   1,2-Dibromo-3-chloropropane; DBCP; .001 .01      
    see Section 5212          
75616   Dibromodifluoromethane; see          
    Difluorodibromomethane          
106934 S 1,2-Dibromomethane; see Ethylene dibromide,          
    Section 5219          
102818 S 2-N-Dibutylaminoethanol 2 14      
107664   Dibutyl phosphate 1 5   2 10
84742   Dibutyl phthalate -- 5      
7572294   Dichloroacetylene 0.1 0.4 C    
95501 S o-Dichlorobenzene 25 150 50 ppm    
106467   p-Dichlorobenzene; 1,4-dichlorobenzene 10 60 200 ppm 110 675
91941 S 3,3'-Dichlorobenzidine; 4,4'-diamino-3,3'-          
    dichlorobiphenyl; see Section 5209          
764410 S 1,4 -Dichloro-2-butene 0.005 0.025      
75718   Dichlorodifluoromethane 1000 4950 6200 ppm    
118525   1,3-Dichloro-5,5-dimethyl hydantoin -- 0.2   -- 0.4
75343   1,1-Dichloroethane 100 400      
107062   1,2-Dichloroethane, see Ethylene dichloride          
75354   1,1-Dichloroethylene; see Vinylidene chloride          
540590   1,2-Dichloroethylene; acetylene dichloride 200 790      
111444 S Dichloroethyl ether; bis(2-chloroethyl) ether 5 30   10 60
75434   Dichlorofluoromethane; Fluorocarbon 21 10 42      
75092   Dichloromethane; see Methylene chloride          
594729   1,1-Dichloro-1-nitroethane 2 10      
78875   1,2-Dichloropropane; see Propylene dichloride          
542756 S Dichloropropene 1 5      
75990   2,2-Dichloropropionic acid 1 6      
76142   1,2-Dichlorotetrafluoroethane; Fluorocarbon 114 1,000 7,000      
62737 S Dichlorvos (DDVP); 2,2-dichlorovinyl          
    dimethyl phosphate 0.1 1      
141662 S Dicrotophos -- 0.25      
5124301   Dicyclohexylmethane-4,4'-diisocyanate;          
    see Methylene bis-(4-cyclohexylisocyanate)          
77736   Dicyclopentadiene 5 30      
102545   Dicyclopentadienyl iron --        
    Total dust -- 10      
    Respirable fraction(n) -- 5      
60571 S Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-          
    1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-          
    dimethanonaphthalene -- 0.25      
111422 S Diethanolamine 0.46 2      
109897 S Diethylamine 5 15 C    
112367 S Diethylene glycol diethyl ether,          
    Ethyl diglyme 5 33      
111966 S Diethylene glycol dimethyl ether, Diglyme 1 5.5   5 27
100378 S 2-(Diethylamino) ethanol 2 9.6      
123911   1,4-Diethylene dioxide; see p-Dioxane          
111400S   Diethylenetriamine 1 4      
60297   Diethyl ether; see Ethyl ether          
117817   Di-(2-ethylhexyl) phthalate;          
    see Di-sec-octyl phthalate          
96220   Diethyl ketone 200 705   300 1057
84662   Diethyl phthalate -- 5      
75616   Difluorodibromomethane; dibromodifluoromethane 100 860      
2238075   Diglycidyl ether; DGE; bis(2,3-epoxypropyl)          
    ether 0.1 0.5      
123319   p-Dihydroxybenzene; see Hydroquinone          
108838   Diisobutyl ketone; 2,6-dimethyl-4-heptanone 25 150      
108189 S Diisopropylamine 5 20      
108203   Diisopropyl ether; see Isopryl ether          
109875   Dimethoxymethane; see Methylal          
127195 S Dimethylacetamide 10 35      
124403   Dimethylamine 5 9.2   15 27.6
60117   4-Dimethylaminoazobenzene, see Section 5209          
1300738   Dimethylaminobenzene; see Xylidene          
121697 S N,N-Dimethylaniline; dimethylphenylamine 5 25   10 50
1330207   Dimethylbenzene; see Xylene          
108849   1,3-Dimethylbutyl acetate; see sec-          
    Hexyl acetate          
300765   o,o-Dimethyl o-(1,2-dibromo-2,2-dichloroethyl)          
    phosphate; see Naled          
14857342   Dimethylethoxysilane 0.5 2.1   1.5 6.4
68122 S Dimethylformamide; DMF 10 30      
108838   2,6-Dimethyl-4-heptanone; see          
    Diisobutyl ketone          
57147 S 1,1-Dimethylhydrazine 0.01 0.025      
67641   Dimethyl ketone; see Acetone          
62759   N,N-Dimethylnitrosamine; see          
    N-Nitrosodimethylamine, Section 5209          
131113   Dimethyl phthalate -- 5      
77781 S Dimethyl sulfate; methyl sulfate 0.1 0.5      
148016   Dinitolmide; 3,5-Dinitro-o-toluamide -- 5      
528290, S Dinitrobenzene (all (isomers)          
99650,   ortho, meta and          
100254   para isomers 0.15 1      
534521 S 4,6-Dinitro-o-cresol; 2-methyl-          
    4,6-dinitrophenol -- 0.2      
25321146 S 2,4-Dinitrotoluene -- 0.15      
123911 S p-Dioxane;          
    1,4-dioxacyclohexane; 0.28 1.0      
    1,4-diethylene dioxide          
78342 S Dioxathion -- 0.2      
92524   Diphenyl; see Biphenyl          
122394   Diphenylamine; N-phenylaniline -- 10      
101688   Diphenylmethane diisocyanate; see          
    Methylene bis(phenylisocyanate)          
123193   Dipropyl ketone 50 235      
34590948 S Dipropylene glycol methyl ether 100 600   150 900
85007   Diquat; 1,1'-ethylene-2,2'-          
    dipyridinium dibromide --        
    Total dust -- 0.5      
    Respirable fraction(n)          
117817   Di-sec-octyl phthalate; bis(2 ethylhexyl) phthalate -- 5   --
97778   Disulfiram -- 2      
298044 S Disulfoton; o,o-diethyl          
      S-2-(ethylthio)ethyl phosphorodithioate -- 0.1      
128370   2,6-Di-tert-butyl-p-cresol -- 10      
330541   Diuron -- 10      
68122   DMF; see Dimethylformamide          
57147   DMH; see 1,1-Dimethylhydrazine          
1321740   Divinyl benzene 10 50      
    Dust, nuisance dust and particulates,          
    see Particulates not otherwise regulated          
12415348   Emery; see Particulates not otherwise regulated          
115297 S Endosulfan; 6,7,8,9,10,10-hexachloro-          
    1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4,          
    3-benzodioxathiepin-3-oxide -- 0.1      
72208 S Endrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-          
    1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-endo-5,          
    8-dimethanonaphthalene -- 0.1      
13838169   Enflurane 2 15      
106898 S Epichlorohydrin; 1-chloro-2,          
    3-epoxypropane 0.05 0.19      
2104645 S EPN; o-ethyl o-(p-nitrophenyl)          
    phenylphosphonothioate -- 0.1      
75569   1,2-Epoxypropane; see Propylene oxide          
556525   2,3-Epoxypropanol; see Glycidol          
74840   Ethane (h) --      
75081   Ethanethiol; see Ethyl mercaptan          
64175   Ethanol; see Ethyl alcohol          
141435   Ethanolamine; 2-aminoethanol 3 8   6 15
563122 S Ethion -- 0.4      
110805 S 2-Ethoxyethanol 5 18      
111159 S 2-Ethoxyethyl acetate 5 27      
141786   Ethyl acetate 400 1,400      
140885 S Ethyl acrylate 5 20   25 100
64175   Ethyl alcohol; ethanol 1,000 1,900      
75047 S Ethylamine 5 9.2 C    
541855   Ethyl sec-amyl ketone; 5-methyl-3-heptanone 25 130      
100414   Ethylbenzene 5 22   30 130
74964 S Ethyl bromide 5 22      
106354   Ethyl butyl ketone; 3-heptanone 50 230   75 345
75003 S Ethyl chloride; chloroethane 100 264      
7085850 Ethyl cyanoacrylate 0.2 1.02      
673923 Ethyl tert-butyl ether 5 21      
74851   Ethylene (h) --      
107073 S Ethylene chlorohydrin; 2-chloroethanol 1 3 C    
107153   Ethylenediamine; 1,2-diaminoethane 10 25      
106934 S Ethylene dibromide; 1,2-dibromoethane,          
    see Section 5219 0.13 1 C    
107062   Ethylene dichloride; 1,2-dichloroethane 1 4 200 ppm 2 8
107211   Ethylene glycol (vapor) 40 100 C    
629141 S Ethylene glycol diethyl ether, 1,2-diethoxyethane 5 24      
110714 S Ethylene glycol dimethyl ether, 1 3.7   5 18
    1,2-dimethoxyethane, Glyme          
628966 S Ethylene glycol dinitrate   (k)   -- 0.1
110805 S Ethylene glycol monoethyl ether, see          
    2-Ethoxyethanol          
109864 S Ethylene glycol monomethyl ether, see          
    2-Methoxyethanol          
110496 S Ethylene glycol monomethyl ether acetate;          
    see 2-Methoxyethyl acetate          
151564 S Ethyleneimine; see also Section 5209 0.5 1      
75218   Ethylene oxide; see Section 5220 1 2   5  
60297   Ethyl ether 400 1,200   500 1500
109944   Ethyl formate 100 300      
75343   Ethylidene chloride; see 1,1-Dichloroethane          
16219753   Ethylidene norbornene 5 25 C    
75081   Ethyl mercaptan; ethanethiol 0.5 1      
78933   Ethyl methyl ketone; see Methyl ethyl ketone          
100743 S N-Ethylmorpholine; 4-ethyl-1,          
      4-tetrahydrooxazine 5 23      
78104   Ethyl silicate; tetraethyl silicate 10 85      
22224926 S Fenamiphos   0.1      
115902   Fensulfothion -- 0.1      
55389 S Fenthion -- 0.2      
14484641   Ferbam; ferric N,N-dimethylthiocarbamate -- 10      
12604589   Ferrovanadium dust -- 1   -- 3
14808607   Fibrous glass, see Glass          
    Flour dust   0.5(s)      
    Fluorides, as F -- 2.5      
7782414   Fluorine 0.1 0.2      
75694   Fluorocarbon 11; see Trichlorofluoromethane          
75718   Fluorocarbon 12; see Dichlorodifluoromethane          
75434   Fluorocarbon 21; see Dichlorofluoromethane          
75456   Fluorocarbon 22; see Chlorodifluoromethane          
76120   Fluorocarbon 112; see 1,1,2,2-Tetrachloro-          
    1,2-difluoroethane          
76131   Fluorocarbon 113; see 1,1,2-Trichloro-1,2,2-          
    trifluoroethane          
    Fluorocarbon 114; see 1,2-          
    Dichlorotetrafluoroethane          
75694   Fluorotrichloromethane; see          
    Trichlorofluoromethane          
944229 S Fonofos -- 0.1      
50000   Formaldehyde, see Section 5217 0.75 --   2 --
75127 S Formamide 10 18      
64186   Formic acid 5 9   10 19
98011 S Furfural 2 8      
98000 S Furfuryl alcohol 10 40   15 60
8006619   Gasoline 300 900   500 1500
7782652   Germanium tetrahydride 0.2 0.6      
    Glass, fibrous 1.0 f/cc(q)        
111308   Glutaraldehyde (t) 0.05 0.2 C    
56815   Glycerin mist; see Particulates not otherwise regulated          
123944   Glyceryl stearate -- 10      
556525   Glycidol; 2,3-epoxy-1-propanol 2 6.1      
111762   Glycol monobutyl ether; see 2-Butoxyethanol          
110805   Glycol monoethyl ether; see 2-Ethoxyethanol          
109864   Glycol monoethyl ether; see 2-Methoxyethanol          
107222   Glyoxal, 1,2-ethanedione   0.1(s), (u)      
    Grain dust (oat, wheat, barley) -- 10      
7782425   Graphite, natural respirable dust   2.5      
    Graphite, synthetic          
    Total dust -- 10      
    Respirable fraction(n) -- 5      
13397245   Gypsum; Calcium sulfate dihydrate; see          
    Particulates not otherwise regulated          
7440586   Hafnium -- 0.5      
151677   Halothane 2 16      
822060   HDI; see Hexamethylene diisocyanate          
7440597   Helium (h) --      
76448 S Heptachlor; 1,4,5,6,7,8,8-hepta-chloro-          
    3a,4,7,7a-tetrahydro-4,7-methanoindene -- 0.05      
142825   n-Heptane 400 1,600   500 2000
118741 S Hexachlorobenzene -- 0.002      
87683 S Hexachlorobutadiene 0.02 0.24      
77474   Hexachlorocyclopentadiene 0.01 0.11      
67721 S Hexachloroethane; perchloroethane 1 10      
1335871 S Hexachloronaphthalene -- 0.2      
684162 S Hexafluoroacetone; 1,1,1,3,3,3-hexafluoro-          
    2-propanone 0.1 0.7      
822060   Hexamethylene diisocyanate; HDI 0.005 0.034      
110543 S n-Hexane 50 180      
    Hexane, other isomers 500 1800   1000 3600
124094   1,6-Hexanediamine 0.5 2.3      
591786   2-Hexanone; see Methyl butyl ketone          
592416   1-Hexene 50 180      
108101   Hexone; see Methyl isobutyl ketone          
108849   sec-Hexyl acetate; 4-methyl-2-pentyl acetate;          
    1,3-dimethyl-butyl acetate 50 300      
107415   Hexylene glycol 25 125 C    
302012 S Hydrazine 0.01 0.013      
10035106   Hydrobromic acid; see Hydrogen bromide          
7647010   Hydrochloric acid; see Hydrogen chloride          
74908   Hydrocyanic acid; see Hydrogen cyanide          
7664393   Hydrofluoric acid; see Hydrogen fluoride          
1333740   Hydrogen (h) --      
61788327   Hydrogenated terphenyls 0.5 5      
10035106   Hydrogen bromide 3 10 C    
7647010   Hydrogen chloride 0.3 0.45 2 ppm    
74908 S Hydrogen cyanide 4.7 5 C    
7664393 S Hydrogen fluoride, as F 0.4 0.33   1 0.83
7722841   Hydrogen peroxide, as H2O2 1 1.4      
7783075   Hydrogen selenide, as Se 0.05 0.2      
7783064   Hydrogen sulfide 10 14 50 ppm 15 21
123319   Hydroquinone; 1,4-benezendiol -- 2      
999611 S 2-Hydroxypropyl acrylate 0.5 3      
95136   Indene 10 48      
7440746   Indium -- 0.1      
    Indium compounds -- 0.1      
7553562   Iodine 0.1 1 C    
75478   Iodoform 0.6 10      
4098719   IPDI; see Isophorone diisocyanate          
1309371   Iron oxide fume -- 5      
13463406   Iron pentacarbonyl, as Fe 0.1 0.8   0.2 1.6
    Iron salts, soluble, as Fe -- 1      
123922   Isoamyl acetate; 3-methylbutyl acetate; see Pentyl acetate          
123513   Isoamyl alcohol; 3-methylbutanol 100 360   125 450
110190   Isobutyl acetate; 2-methylpropyl acetate 150 700      
78831   Isobutyl alcohol; 2-methylpropanol 50 150      
26675467   Isoflurane 2 15      
26952216 S Isooctyl alcohol 50 270      
78591   Isophorone; 3,5,5-trimethyl-2-cyclohexene-          
    1-one 4 23      
4098719 S Isophorone diisocyanate; IPDI 0.005 0.045   0.02 --
109591   Isopropoxyethanol 25 105      
108214   Isopropyl acetate 250 950   310 1185
67630   Isopropyl alcohol 400 980   500 1225
75310   Isopropylamine 5 12   10 24
768525 S N-isopropylaniline 2 10      
108203   Isopropyl ether; diisopropyl ether 250 1,050      
4016142   Isopropyl glycidyl ether; IGE;          
    1,2-epoxy-3-isopropoxypropane 50 240   75 360
1332587   Kaolin; (respirable dust containing no          
    asbestos and <1% crystaline silica) -- 2      
463514   Ketene; ethenone 0.5 0.9   1.5 3
    Lead arsenate, see Sections 5214 and 5198          
7758976   Lead chromate, as Pb -- 0.02      
    as Cr -- 0.005      
    (see also Section 5198, 1532.1, 1532.2, 5206 & 8359)          
    Lead (metallic) and inorganic compounds, dust          
    and fume, as Pb (see also Section 5198 ) -- 0.05      
78002   Lead tetraethyl, see Tetraethyl lead          
75741   Lead tetramethyl, see Tetramethyl lead          
1317653   Limestone; calcium carbonate; see          
    Particulates not otherwise regulated          
58899 S Lindane; 1,2,3,4,5,6-hexachlorocyclohexane,          
    gamma isomer -- 0.5      
7580678   Lithium hydride -- 0.025      
    L.P.G.; liquefied petroleum gas 1,000 1,800      
4485125   Lithium stearate -- 10      
13717005   Magnesite; magnesium carbonate; see          
    Particulates not otherwise regulated          
1309484   Magnesium oxide fume, as Mg -- 10      
557040   Magnesium stearate -- 10      
121755 S Malathion; o,o-dimethyl S-1(1,2-          
    dicarboethyoxyethyl) phosphorodithioate -- 10      
108316   Maleic anhydride; cis-butenedioic anhydride 0.1 0.4      
    Manganese and compounds, as Mn -- 0.2      
7439965   Manganese fume, as Mn -- 0.2   -- 3
12079651 S Manganese, cyclopentadienyl-tricarbonyl,          
    as Mn -- 0.1      
    Manganese tetroxide -- 0.2      
    Marble; calcium carbonate; see          
    Particulates not otherwise regulated          
101779 S MDA; see 4,4'-Methylene dianiline          
101688   MDI; see Methylene bis(phenylisocyanate)          
7439976 S Mercury alkyls, as Hg -- 0.01 0.04 mg/M3 -- 0.03
7439976 S Mercury, metallic and inorganic compounds as Hg -- 0.025 0.1 mg/M3    
7439976 S Mercury aryl compounds as Hg -- 0.01 C    
108678   Mesitylene; see 1,3,5-Trimethylbenzene          
141797   Mesityl oxide; 4-methyl-3-pentene-2-one 15 60   25 100
79414 S Methacrylic acid 20 70      
74828   Methane (h) --      
74931   Methanethiol; see Methyl mercaptan          
67561   Methanol; see Methyl alcohol          
16752775 S Methomyl -- 2.5      
72435   Methoxychlor; 1,1,1-trichloro-2,          
    2-bis(p-methoxyphenyl)ethane -- 10      
109864 S 2-Methoxyethanol 5 16      
110496   2-Methoxyethyl acetate 5 24      
76380   Methoxyflurane 2 13      
150765   4-Methoxyphenol -- 5      
79209   Methyl acetate 200 610   250 760
74997   Methyl acetylene; propyne 1,000 1,650      
    Methyl acetylene-propadiene mixture; MAPP 1,000 1,800   1250 2250
96333 S Methyl acrylate 10 35      
126987 S alpha-Methylacrylonitrile 1 3      
624419 2-Methylbutyl acetate; see Pentyl acetate          
109875   Methylal; dimethoxymethane 1,000 3,100      
67561 S Methyl alcohol; methanol 200 260 1000 ppm 250 325
74895   Methylamine 5 6.4   15 19
108112   Methyl amyl alcohol; see Methyl          
    isobutyl carbinol          
110430   Methyl n-amyl ketone; 2-heptanone 50 235      
100618 S N-Methylaniline; monomethylaniline 0.5 2      
95534   o-Methylaniline; see o-Toluidine          
74839 S Methyl bromide 1 3.88 20 ppm    
591786 S Methyl n-butyl ketone; 2-hexanone 1 4   10 40
74873   Methyl chloride 50 105 300 ppm 100 210
71556   Methyl chloroform; 1,1,1-trichloroethane 350 1900 800 ppm 450 2450
107302   Methyl chloromethyl ether; see Section 5209          
75058   Methyl cyanide; see Acetonitrile          
137053   Methyl 2-cyanoacrylate 0.2 0.908      
108872   Methylcyclohexane 400 1,600      
25639423   Methylcyclohexanol (meta- and          
    para-isomer mixture) 50 235      
583608 S o-Methylcyclohexanone 50 230   75 345
12108133 S 2-Methylcyclopentadienyl manganese          
    tricarbonyl, as Mn -- 0.2      
8022002 S Methyl demeton; a mixture of o,o-dimethyl          
    o-(2-(ethylthio)ethyl) phosphorothioate and          
    o,o-dimethyl S-(2-(ethylthio)-ethyl)          
    phosphorothioate -- 0.5      
101144 S 4,4'-Methylene bis(2-chloroaniline), -- 0.01      
    see also Section 5215          
5124301   Methylene bis(4-cyclohexylisocyanate);          
    hydrogenated MDI 0.005 0.054      
101688   Methylene bis(phenylisocyanate); MDI;          
    diphenylmethane diisocyanate 0.005 0.051      
75092   Methylene chloride; dichloromethane 25 87   125 435
    (see also section 5202)          
101779 S 4,4'-Methylene dianiline; MDA 0.01 0.08   0.1 0.8
    (see also Sections 1535 and 5200 )          
78933   Methyl ethyl ketone; MEK; 2-butanone;          
    ethyl methyl ketone 200 590   300 885
1338234   Methyl ethyl ketone peroxide 0.2 1.5 C    
107313   Methyl formate 100 250   150 375
60344 S Methyl hydrazine; monomethyl hydrazine 0.01 0.019      
74884 S Methyl iodide 2 10      
110123   Methyl isoamyl ketone 50 234      
108112 S Methyl isobutyl carbinol; 4-methyl-2-pentanol;          
    methyl amyl alcohol 25 100   40 165
108101   Methyl isobutyl ketone; Hexone 50 205   75 300
624839 S Methyl isocyanate 0.02 0.05      
563804   Methyl isopropyl ketone 200 705      
74931   Methyl mercaptan 0.5 1      
80626   Methyl methacrylate; methyl          
    2-methyl-2-propenoate 50 205   100 410
298000 S Methyl parathion; o,o-dimethyl          
    o-(p-nitrophenyl) phosphorothioate -- 0.2      
107879   Methyl propyl ketone; 2-pentanone 200 700   250 875
872504 S N-Methylpyrrolidone (NMP); 1 4      
    1-Methyl-2-pyrrolidone;      
    N-Methyl-2-pyrrolidone;      
    1-Methyl-2-pyrrolidinone      
681845   Methyl silicate; tetramethyl silicate 1 6      
98839   alpha-Methylstyrene; 1-methyl-          
    1-phenylethene 50 240   100 485
77781   Methyl sulfate; see Dimethyl sulfate          
1634044   Methyl tert-butyl ether; MTBE 40 144      
78944 S Methyl vinyl ketone 0.05 0.14 C    
21087649   Metribuzin -- 5      
7786347 S Mevinphos; 2-carbomethoxyl-          
    1-propen-2-yl dimethyl phosphate 0.01 0.1   0.03 0.3
    Mica, see Silicates          
    Mineral wool fiber; see Particulates not otherwise regulated          
7439987   Molybdenum, insoluble compounds, as Mo --        
      Total dust -- 10      
      Respirable fraction (n) -- 3      
    Molybdenum, soluble compounds, as Mo -- 0.5(n)      
6923224   Monocrotophos -- 0.25      
100618   Monomethylaniline; see N-Methylaniline          
60344   Monomethylhydrazine; see Methyl hydrazine          
110918 S Morpholine; tetrahydro-4H-1, 4-oxazine 20 70   30 105
7647010   Muriatic acid; see Hydrogen chloride          
300765 S Naled; o,o-dimethyl o-          
    (1,2-dibromo-2,2-dichloroethyl) phosphate -- 3      
8030317   Naphtha, coal tar 100 400      
91203 S Naphthalene 0.1 0.5      
134327   alpha-Naphthylamine; 1-naphthylamine,          
    see Section 5209          
91598   beta-Naphthylamine; 2-naphthylamine,          
    see Section 5209          
63252   1-Naphthyl N-methylcarbamate; see Carbaryl          
25551284   Naphthalene diisocyanate; NDI 0.01 0.085 C    
7440019   Neon (h)        
13463393   Nickel carbonyl; Ni (CO)4 0.001 0.007      
7440020   Nickel metal, as Ni -- 0.5      
    Nickel, insoluble compounds, as Ni -- 0.1      
    Nickel, soluble compounds, as Ni -- 0.05      
12035722   Nickel subsulfide -- 0.05      
54115 S Nicotine; 1-methyl-2-(3-pyridyl)-pyrrolidine 0.075 0.5      
1929824   Nitrapyrin --        
    Total dust -- 10      
    Respirable fraction(n) -- 5      
7697372   Nitric acid 2 5   4 10
10102439   Nitric oxide; NO 25 30      
100016 S p-Nitroaniline -- 3      
98953 S Nitrobenzene 1 5      
100005 S p-Nitrochlorobenzene;          
    1-chloro-4-nitrobenzene 0.1 0.64      
92933   4-Nitrodiphenyl, see Section 5209          
79243   Nitroethane 100 310      
7727379   Nitrogen (h) --      
10102440   Nitrogen dioxide       1 1.8
    Nitrogen tetroxide; N2O4; see Nitrogen dioxide          
7783542   Nitrogen trifluoride 10 29      
55630 S Nitroglycerin   (k)   -- 0.1
75525   Nitromethane 2 5      
108032   1-Nitropropane 25 90      
79469   2-Nitropropane 10 35      
62759   N-Nitrosodimethylamine, see Section 5209          
1321126, S Nitrotoluene 2 11      
99081,            
88722,            
99990            
76062   Nitrotrichloromethane; see Chloropicrin          
10024972   Nitrous oxide 50 90      
111842   Nonane 200 1,050      
    Nuisance particulates, see Particulates not otherwise regulated          
    Total dust -- 10      
    Respirable fraction(n) -- 5      
2234131 S Octachloronaphthalene -- 0.1   -- 0.3
111659   Octane 300 1,450   375 1800
8012951   Oil (mineral) mist, particulate -- (5)(l)      
    Oil (vegetable) mists (except castor, cashew          
    nut or similar irritant oils); see Nuisance          
    particulates          
    Organic arsenic compounds; see          
    Arsenic, organic          
20816120   Osmium tetroxide, as Os 0.0002 0.002   0.0006 0.006
144627   Oxalic acid -- 1   -- 2
7783417   Oxygen difluoride 0.05 0.1 C    
10028156   Ozone 0.1 0.2   0.3 0.6
8002742   Paraffin wax fume -- 2      
1910425, S Paraquat, total particulates -- 0.5      
2074502            
1910425, S Paraquat, respirable sizes -- 0.1(n)      
2074502            
56382 S Parathion; o,o-diethyl o-(p-nitrophenyl)          
    phosphorothioate -- 0.1      
    Particulates not otherwise regulated          
    Total dust -- 10      
    Respirable fraction(n) -- 5      
    Particulate polycyclic;          
    aromatic hydrocarbons (PPAH) see          
    Coal tar pitch volatiles          
    PCB; see Chlorodiphenyl          
87865 S PCP; see Pentachlorophenol          
19624227   Pentaborane 0.005 0.01   0.015 0.03
1321648 S Pentachloronaphthalene -- 0.5      
87865 S Pentachlorophenol; PCP -- 0.5      
115775   Pentaerythritol; tetrakis-          
    (hydroxymethyl)methane; tetra-methylolmethane;          
    see Particulates not otherwise regulated          
109660   Pentane 600 1,800  
107879   2-Pentanone; see Methyl propyl ketone          
628637;
626380;
123922;
625161;
620111;
624419		   Pentyl acetate 50 266   100 532
67721   Perchloroethane; see Hexachloroethane          
127184   Perchloroethylene 25 170 300 ppm 100 685
594423   Perchloromethyl mercaptan;          
    trichloromethanethiol 0.1 0.8      
7616946   Perchloryl fluoride; C1O3F 3 14   6 28
382218   Perfluoroisobutylene 0.01 0.082 C    
    Perlite          
    Total dust -- 10      
    Respirable fraction(n) -- 5      
108952 S Phenol 5 19      
92842 S Phenothiazine; dibenzothiazine -- 5      
106503 S p-Phenylenediamine -- 0.1      
101848   Phenyl ether, vapor 1 7      
100425   Phenylethylene; see Styrene          
122601 S Phenyl glycidyl ether, PGE;1,2-epoxy-          
    3-phenoxypropane 0.1 0.6      
100630 S Phenylhydrazine 5 20   10 45
108985   Phenyl mercaptan 0.5 2      
638211   Phenylphosphine 0.05 0.25 C    
298022 S Phorate; o,o-diethyl S-(ethylthio)methyl          
    phosphorodithioate -- 0.05   -- 0.2
75445   Phosgene; carbonyl chloride; COCl2 0.1 0.4      
7803512   Phosphine; PH3 0.3 0.4   1 1
7664382   Phosphoric acid -- 1   -- 3
7723140   Phosphorus, yellow -- 0.1      
10025873   Phosphorus oxychloride 0.1 0.6      
10026138   Phosphorus pentachloride 0.1 1      
1314803   Phosphorus pentasulfide; P2S5 -- 1   -- 3
7719122   Phosphorus trichloride 0.2 1.5   0.5 3
85449   Phthalic anhydride 1 6      
626175   m-Phthalodinitrile -- 5      
1918021   Picloram --        
      Total dust -- 10      
    Respirable fraction(n) -- 5      
88891 S Picric acid; 2,4,6-trinitrophenol -- 0.1      
83261   Pindone; 2-pivalyl-1, 3-indandione   0.1      
142643   Piperazine dihydrochloride -- 5      
26499650   Plaster of Paris; calcium sulfate hemihydrate;          
    see Particulates not otherwise regulated          
7440064   Platinum, metal -- 1      
    Platinum, soluble salts, as Pt -- 0.002      
    Polychlorobiphenyls, see Chlorodiphenyl          
    Polytetrafluoroethylene, decomposition products -- (m)      
    Portland Cement; see Particulates not otherwise regulated          
1310583   Potassium hydroxide; caustic potash -- 2 C    
593293   Potassium stearate -- 10      
74986   Propane 1000 1800 (h)      
107197 S Propargyl alcohol; 2-propyn-1-o1 1 2      
57578   beta-Propiolactone, see Section 5209 0.5 1.5      
79094   Propionic acid 10 30      
114261   Propoxur; 2-isopropoxyphenyl N-methyl          
    carbamate   0.5      
109604   n-Propyl acetate 200 840   250 1050
71238 S n-Propyl alcohol 200 500   250 625
115071   Propylene (h) --      
78875   Propylene dichloride; 1,2-dichloropropane 75 350   110 510
6423434 S Propylene glycol dinitrate; PGDN 0.05 0.3      
107982 S Propylene glycol monomethyl ether 100 360   150 540
108656 S Propylene glycol monomethyl ether acetate 100 541   150 811
75558 S Propyleneimine; 2-methylaziridine 2 5      
75569   Propylene oxide; 1,2-epoxy-propane 2 4.75      
627134   n-Propyl nitrate 25 107   40 170
74997   Propyne; see Methylacetylene          
8003347   Pyrethrum -- 5      
110861   Pyridine 5 15      
106514   Quinone 0.1 0.4      
121824   RDX; see Cyclonite          
    Refractory ceramic fiber   0.2f/cc(q)      
108463   Resorcinol 10 45   20 90
7440166   Rhodium, metal -- 0.1      
    Insoluble compounds, as Rh -- 0.1      
    Soluble salts, as Rh -- 0.001      
299843   Ronnel; o,o-dimethyl o-(2,4,5- -- 10      
    trichlorophenyl) phosphorothioite          
    Rosin core solder, pyrolysis products,          
    as formaldehyde -- 0.1      
83794   Rotenone, commercial -- 5      
1309371   Rouge; see Particulates not otherwise regulated          
    Rubber solvent (Naphtha) 400 1,600      
    Selenium compounds, as Se -- 0.2      
7783791   Selenium hexafluoride 0.05 0.4      
136787   Sesone; sodium 2,4-dichloro-phenoxyethyl          
      sulfate          
    Total dust -- 10      
    Respirable fraction(n) -- 5      
61790532   Silica, amorphous          
    Diatomaceous earth          
    Total dust -- 6      
    Respirable fraction(n) -- 3      
    Precipitated and gel -- 6      
    Silica, crystalline, respirable dust (n)          
14464461   Cristobalite, (see also Sections 1532.3 & 5204) -- 0.05      
14808607   Quartz, (see also Sections 1532.3 & 5204) -- 0.05      
60676860   Silica, fused, respirable dust -- 0.1      
15468323   Tridymite, (see also Sections 1532.3 & 5204) -- 0.05      
1317959   Tripoli, (as quartz) (see also Sections 1532.3 & 5204) -- 0.05      
    Silicates (<1% crystalline silica)          
12001262   Mica (respirable dust) -- 3      
    Soapstone, total dust -- 6      
    Soapstone, respirable dust -- 3      
    Talc (containing asbestos); see Section 5208          
14807966   Talc (containing no asbestos fibers),          
    respirable dust -- 2      
    Tremolite (containing no asbestos fibers),          
    respirable dust -- 2      
7440213   Silicon; see Particulates not otherwise regulated          
409212   Silicon carbide; SiC; see Particulates not otherwise regulated          
7803625   Silicon tetrahydride; silane 5 7      
7440224   Silver metal, as Ag -- 0.01      
    Silver, soluble compounds, as Ag -- 0.01      
    Soapstone, see Silicates          
26628228 S Sodium azide 0.1 0.3 C    
7631905   Sodium bisulfite -- 5      
136787   Sodium 2,4-dichlorophenoxyethyl sulfate;          
    see Sesone          
62748 S Sodium fluoroacetate -- 0.05   -- 0.15
1310732   Sodium hydroxide; caustic soda -- 2 C    
7681574   Sodium metabisulfite -- 5      
822162   Sodium stearate -- 10      
9005258   Starch; see Particulates not otherwise regulated          
7789062   Strontium chromate, as Cr -- 0.0005      
      (see also Sections 1532.2, 5206 & 8359)          
    Stearates; see specific compound          
7803523   Stibine; SbH3 0.1 0.5      
8052413   Stoddard solvent 100 525      
57249   Strychnine -- 0.15      
100425 S Styrene (monomer); phenylethylene 50 215 500 ppm 100 425
9014011   Subtilisins (as pure crystalline          
    proteolytic enzymes) --       0.00006(r)
57501   Sucrose; see Particulates not otherwise regulated          
74222972   Sulfometuron methyl -- 3.5      
3689245 S Sulfotep; tetraethyl dithionopyrophosphate   0.2      
7446095   Sulfur dioxide 2 5   5 10
2551624   Sulfur hexafluoride 1,000 6,000      
7664939   Sulfuric acid -- 0.1   -- 3
10025679   Sulfur monochloride; S2Cl2 1 6 C    
5714227   Sulfur pentafluoride; S2F10 0.01 0.1 C    
7783600   Sulfur tetrafluoride 0.1 0.4 C    
2699798   Sulfuryl fluoride; SO2F2 5 20   10 40
35400432   Sulprofos   1      
93765   2,4,5-T;2,4,5-trichlorophenoxyacetic acid -- 10      
    Talc; see Silicates          
7440257   Tantalum metal dust, as Ta -- 5      
1314610   Tantalum oxide dust, as Ta -- 5      
78308   TCP; see Triorthocresyl phosphate          
584849   TDI; see Toluene-2,4-diisocyanate          
3689245 S TEDP; see Sulfotep          
    Tellurium and compounds, as Te -- 0.1      
7783804   Tellurium hexafluoride 0.02 0.2      
3383968   Temephos; o,o,o' ,o'-tetramethyl o,o'-          
    thiodi-p-phenylene phosphorothioate          
      Total dust -- 10      
    Respirable fraction(n) -- 5      
107493 S TEPP; tetraethyl pyrophosphate; 0.004 0.05      
100210   Terephthalic acid -- 10      
    Terphenyls 0.5 5 C    
79276   1,1,2,2-Tetrabromoethane; see          
    Acetylene tetrabromide          
76119   1,1,1,2-Tetrachloro-2,2-difluoroethane 500 4170      
76120   1,1,2,2-Tetrachloro-1,2-difluoroethane;          
    fluorocarbon 112 500 4,170      
79345 S 1,1,2,2-Tetrachloroethane; acetylene          
    tetrachloride 1 7      
127184   Tetrachloroethylene; see Perchloroethylene          
56235   Tetrachloromethane; see Carbon tetrachloride          
1335882 S Tetrachloronaphthalene -- 2      
3689245   Tetraethyl dithionopyrophosphate; see Sulfotep          
78002 S Tetraethyl lead; tetraethylplumbane, as Pb -- 0.075      
107493   Tetraethyl pyrophosphate; see TEPP          
109999   Tetrahydrofuran 200 590   250 735
75741 S Tetramethyl lead; tetramethylplumbane, as Pb -- 0.075      
115775   Tetramethylolmethane; see Pentaerythritol          
3333526 S Tetramethyl succinonitrile (decomposition          
    product of 2,2'-azobisisobutyronitrile) 0.5 3      
137268   Tetramethyl thiuram disulfide, see Thiram          
509148   Tetranitromethane 0.005 0.04      
7722885   Tetrasodium pyrophosphate -- 5      
479458 S Tetryl; 2,4,6-trinitrophenylmethylnitramine -- 1.5      
  S Thallium, soluble compounds, as Tl -- 0.1      
109999   THF; see Tetrahydrofuran          
96695   4,4'-Thiobis(6-tert-butyl-m-cresol) --        
    Total dust -- 10      
    Respirable fraction(n) -- 5      
68111 S Thioglycolic acid 1 3.8      
7719097   Thionyl chloride 1 5 C    
137268   Thiram; bis(dimethylthiocarbamoyl) disulfide -- 5      
  S Tin, organic compounds, as Sn -- 0.1   -- 0.2
21651194   Tin, tin oxide and inorganic compounds,          
    except SnH4, as Sn -- 2      
13463677   Titanium dioxide, as Ti; see Particulates          
    not otherwise regulated          
137268   TMTD; see Thiram          
118967   TNT; see 2,4,6-Trinitrotoluene          
108883 S Toluene; toluol 10 37 500 ppm 150 560
584849   Toluene-2,4-diisocyanate; TDI 0.005 0.04 0.02 ppm 0.02 0.15
108441 S m-Toluidine 2 9      
95534 S o-Toluidine; o-methylaniline 2 9      
106490 S p-Toluidine 2 9      
8001352   Toxaphene; see Chlorinated camphene          
115866   TPP; see Triphenyl phosphate          
    Tremolite, nonasbestiform; see Silicates          
75252   Tribromomethane; see Bromoform          
126738   Tributyl phosphate 0.2 2.5      
76039   Trichloroacetic acid 1 5      
120821   1,2,4-Trichlorobenzene 5 40 C    
50293   1,1,1,-Trichloro-2,2-bis(p-chlorophenyl)ethane;          
    see DDT          
71556   1,1,1-Trichloroethane; see Methyl chloroform          
79005 S 1,1,2-Trichloroethane 10 45      
79016   Trichloroethylene; trichloroethene 25 135 300 ppm 100 537
75694   Trichlorofluoromethane; Fluorocarbon 11 1,000 5,600 C    
67663   Trichloromethane; see Chloroform          
594423   Trichloromethanethiol; see Perchloromethyl          
    mercaptan          
1321659 S Trichloronaphthalene -- 5      
76062   Trichloronitromethane; see Chloropicrin          
93765   2,4,5-Trichlorophenoxyacetic acid          
    see 2,4,5-T          
96184   1,2,3-Trichloropropane 10 60      
76131   1,1,2-Trichloro-1,2,2- trifluoroethane 1000 7600 2000 ppm 1250 9500
78308   Tricresyl phosphate; see Triorthocresyl          
    phosphate          
13121705   Tricyclohexyltin hydroxide; see Cyhexatin          
102716   Triethanolamine -- 5      
121448 S Triethylamine 1 4.1 C    
112492 S Triethylene glycol dimethyl ether, Triglyme 5 36      
75638   Trifluorobromomethane 1,000 6,100      
2451629   1,3,5-Triglycidyl-s-triazinetrione   0.005      
552307   Trimellitic anhydride 0.005 0.04 C    
75503   Trimethylamine 5 12   15 36
    Trimethylbenzene, all isomers 25 125      
121459   Trimethyl phosphite 2 10      
88891   2,4,6-Trinitrophenol; see Picric acid          
479458   2,4,6-Trinitrophenylmethyl nitramine;          
    see Tetryl          
118967 S 2,4,6-Trinitrotoluene; TNT -- 0.5      
78308 S Triorthocresyl phosphate -- 0.1      
603349   Triphenylamine -- 5      
115866 S Triphenyl phosphate; TPP -- 3      
7440337   Tungsten metal, as W -- 5      
    Tungsten, insoluble compounds, as W -- 5   -- 10
    Tungsten, soluble compounds, as W -- 1   -- 3
8006642   Turpentine 100 560      
    Uranium (natural), insoluble compounds, as U -- 0.2   -- 0.6
    Uranium (natural), soluble compounds, as U -- 0.05      
110623   Valeraldehyde 50 175      
1314621   Vanadium pentoxide (V2O5), respirable dust          
    and fume -- 0.05(n)      
75014 S VC; see Vinyl chloride, Section 5210          
    Vegetable oil mists (except castor, cashew          
    nut or similar irritant oils); see Particulates          
    not otherwise regulated          
108054   Vinyl acetate 10 30   15 45
100425   Vinylbenzene; see Styrene          
593602   Vinyl bromide; bromoethylene 0.1 0.44      
75014 S Vinyl chloride, see Section 5210 1        
107131 S Vinyl cyanide, see Acrylonitrile, Section 5213          
100403 S 4-Vinyl cyclohexene 0.1 0.4      
106876 S Vinyl cyclohexene dioxide 0.1 0.57      
75025   Vinyl fluoride 0.2 0.38      
75354   Vinylidene chloride; 1,1-dichloroethylene 1 4      
75387   Vinylidene fluoride 100 262      
25013154   Vinyltoluene 50 240      
8030306   VM & P (Varnish Makers and Painters) Naphtha 300 1,350   400 1800
81812   Warfarin; 3-(alpha-acetonyl-benzyl)-4- -- 0.1      
    hydroxycoumarin          
    Welding fumes; total particulates (see also          
    individual constituents) -- 5      
    Wood dust --        
    All soft and hard woods, except Western          
    red cedar -- 2   -- 5
    Wood dust, Western red cedar-- -- 0.5      
1330207   Xylene; xylol; dimethylbenzene 100 435 300 ppm 150 655
1477550 S m-Xylene-a,a'-diamine -- 0.1 C    
1300738 S Xylidine; aminodimethylbenzene 0.5 2.5      
    Yttrium compounds, as Y -- 1      
7646857   Zinc chloride fume -- 1   -- 2
13530659   Zinc chromate, as Cr -- 0.005      
      (see also Sections 1532.2, 5206 & 8359)          
15930946   Zinc chromate hydroxide, as Cr -- 0.005      
      (see also Sections 1532.2, 5206 & 8359)          
1314132   Zinc oxide fume -- 5   -- 10
    Zinc oxide dust, see Particulates not otherwise regulated          
11103869   Zinc potassium chromate, as Cr -- 0.005      
      (see also Sections 1532.2, 5206 & 8359)          
557051   Zinc stearate -- 10      
37300235   Zinc yellow, as Cr -- 0.005      
      (see also Sections 1532.2, 5206 & 8359)          
    Zirconium compounds, as Zr -- 5   -- 10
s

Footnotes to Table AC-1

(a) The Chemical Abstracts Service Registry Number is a designation used to identify a specific compound or substance regardless of the naming system; these numbers were obtained from the Desk Top Analysis Tool for the Common Data Base and from the Chemical Abstracts Indexes.

(b) Refer to section 5155(d) for the significance of the Skin notation.

(c) Trade Names Removed from Table AC-1. 

  Trade Name Chemical/Generic Name
Abate                            see  Temephos
Ammate                           see  Ammonium Sulfamate
Aqualin                          see  Acrolein
Arasan                           see  Thiram
Azodrin                          see  Moncrotophos
Baygon                           see  Propoxur
Bidrin                           see  Dicrotophos
Butyl Cellosolve                 see  2-Butoxyethanol
Cellosolve                       see  2-Ethoxyethanol
Cellosolve Acetate               see  2-Ethoxyethyl acetate
Compound 1080                    see  Sodium Fluoracetate
Coyden                           see  Clopidol
Crag Herbicide                   see  Sesone
Cythion                          see  Malathion
Dasanit                          see  Fensulfothion
Delnav                           see  Dioxathion
Dibrom                           see  Naled
Difolatan                        see  Captafol
Disyston                         see  Disulfoton
Dowtherm A                       see  Phenylether and Biphenyl
Dursban                          see  Chloropyrifos
Dyfonate                         see  Fonofos
Fermate                          see  Ferbam
Freons                           see  Fluorocarbons
Furadan                          see  Carbofuran
Guthion                          see  Azinphos Methyl
Korlan                           see  Ronnel
Lannate                          see  Methomyl
Mariate                          see  Methoxychlor
MLT                              see  Malathion
Moxie                            see  Methoxychlor
Nialate                          see  Ethion
Nankor                           see  Ronnel
Phosdrin                         see  Mevinphos
Pival                            see  Pindone
Plictran                         see  Cyhexatin
Santobrite                       see  Pentachlorophenol
Sevin                            see  Carbaryl
Systox                           see  Demeton
Teflon                           see  Polytetrafluoroethylene
Thimet                           see  Phorate
Thiodan                          see  Endosulfan
Tordon                           see  Picloram
Trolene                          see  Ronnel
Vapona                           see  Dichlorvos
Weedone 638                      see  2, 4-D
Zoalene                          see  Dinitolmide

(d) For the definition and the application of the Permissible Exposure Limit (PEL), refer to section 5155(b) and (c)(1).

(e) Parts of gas or vapor per million parts of air by volume at 25°C and 760mm Hg pressure.

(f) Milligrams of substance per cubic meter of air at 25°C and 760mm Hg pressure.

(g) Refer to section 5155(b) and (c)(3) for the significance of the Ceiling notation. A "C" notation in this column means the values given in the PEL columns are ceiling values. A numerical entry in this column represents a ceiling value in addition to the TWA values.

(h) A number of gases and vapors, when present in high concentrations, act primarily as asphyxiants without other adverse effects. A concentration limit is not included for each material because the limiting factor is the available oxygen. (Several of these materials present fire or explosion hazards.)

(i) Coal tar pitch volatiles (benzene or cyclohexane-soluble fraction) include fused polycyclic hydrocarbons (some of which are known carcinogens) which volatilize from the distillation residues of coal, petroleum (excluding asphalt), wood, and other organic matter. Asphalt (CAS 8052-42-4, and CAS 64742-93-4) is not covered under the "coal tar pitch volatiles" standard.

(j) This standard applies to the cotton waste processing operations of waste recycling (sorting, blending, cleaning, and willowing) and garnetting. It does not apply to cotton gins, cottonseed oil industry, or operations covered by section 5190.

(k) A PEL of 0.05 ppm shall apply to exposures involving a mixture of ethylene glycol dinitrate and nitroglycerin.

(l) As sampled by method that does not collect vapor.

(m) Thermal decomposition of the fluorocarbon chain in air leads to the formation of oxidized products containing carbon, fluorine and oxygen. An index of exposure to these products is possible through their alkaline hydrolysis followed by a quantitative determination of fluoride content. No particular concentration limit is specified pending evaluation of the toxicity of the products but concentrations should be kept below the sensitivity of the analytical method.

(n) The concentration and percentage of the particulate used for this limit are determined from the fraction passing a size selector with the following characteristics:
Aerodynamic Diameter
in Micrometers
(unit density sphere)		 Percent
Passing Selector
0.................................................. 100
1.................................................. 97
2.................................................. 91
3................................................... 74
4................................................... 50
5................................................... 30
6................................................... 17
7................................................... 9
8................................................... 5
10.................................................... 1

(o) Refer to sections 5155(b) and (c)(2) for the definition and application of the Short Term Exposure Limit (STEL).

(p) (Reserved)

(q) Fibers per cubic centimeter of air at 25°C and 760mm Hg pressure. To be considered a fiber for this limit the glass particle must be longer than 5µm, have a length to diameter ratio of three or more, and have a diameter less than 3µm. The National Institute for Occupational Safety and Health (NIOSH), Method 7400, Issue 2, August 15, 1994, which is hereby incorporated by reference, shall be used for measuring airborne fiber concentrations.

(r) Compliance with the subtilisins PEL is assessed by sampling with a high volume sampler (600-800 liters per minute) for at least 60 minutes.

(s) The concentration and percentage of the particulate used for this limit are determined from the fraction passing a size selector with the following characteristics:
Aerodynamic Diameter
in Micrometers
(unit density sphere)		 Percent
Passing Selector
0.................................................. 100
1.................................................. 97
2.................................................. 94
5.................................................. 87
10.................................................. 77
20.................................................. 65
30.................................................. 58
40.................................................. 54.5
50.................................................. 52.2
100.................................................. 50

(t) Glutaraldehyde can cause occupational asthma and skin sensitization responses such as contact dermatitis. Exposure related symptoms may include one or more of the following: shortness of breath, chest tightness, wheeze, cough, skin rash, hives, and irritation of the nose, throat, skin or eye. Hazard communication training required by sections 5191 or 5194 shall address these health hazards and symptoms along with the measures taken by the employer to evaluate and control exposures that can include medical evaluations, exposure monitoring, ventilation systems, work practices, and personal protective equipment. The communication system required by section 3203 shall inform employees where to report possible health symptoms and where to ask questions, report concerns, and receive information about the employer’s evaluation and control measures.

(u) This PEL applies to the sum of the exposures to the substance in the vapor state and from the particulate fraction specified in footnote (s) in this table.

Note:  Authority cited:  Section 142.3, Labor Code.  Reference:  Sections 142.3 and 144.6, Labor Code.