PERMISSIBLE EXPOSURE LIMITS FOR CHEMICAL CONTAMINANTS

TABLE AC-1
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.