N.Y. Comp. Codes R. & Regs. tit. 12, § 12-3.1 – General.

^(a) Parts of vapor or gas per million parts of contaminated air by volume at 25 degrees Centigrade and 760 mm. Hg pressure.
^(b) Approximate milligrams of particulate per cubic meter of air.

^(d) An atmospheric concentration of not more than 0.02 ppm, or personal protection may be necessary to avoid headache.

* 1969 addition.

** Registered trade name.

A No exposure or contact permitted by any route (respiratory, oral or skin).

C Ceiling limit which shall not be exceeded even momentarily or infrequently.

A¹ No exposure or contact permitted by any route (respiratory, oral or skin).

A² No TLV recommended pending termination of toxicity or products, but air concentrations should be minimal.

TABLE II—Mineral Dusts

Substance	Million Particles Per Cubic Foot*
Asbestos	5
Dust (nuisance, no free silica)	50
Graphite (natural)	15
Mica (below 1% free silica)	20
Portland cement	50
Silica—
Class I**	50
Class II**	20
Class III**	10
Class IV**	5
Slate (below 1% free silica)	50
Soapstone (below 1% free silica)	20
Talc (below 1% free silica)	20
Tremolite	5
Total dust (below 1% free silica)	50

____

* Using the light field low–power method of counting as described in the U.S. Public Health Report 47 No. 12, March 12, 1932, pp. 669-672 or its equivalent and a standard type impinger or other equivalent instrument for taking atmospheric dust samples.

** Class I rock. Any rock formation uniformly containing up to and including 5%, by weight, of free silicon dioxide.

** Class II rock. Any rock formation uniformly containing more than 5%, up to and including 10%, by weight, of free silicon dioxide.

** Class III rock. Any rock formation uniformly containing more than 10%, up to and including 40%, by weight, of free silicon dioxide.

** Class IV rock. Any rock formation containing more than 40%, by weight, of free silicon dioxide.

The existence of air contaminants consisting of or deriving from the substances named in the following tables in relative quantities greater than those set forth as to each substance shall constitute prima facie evidence that such contaminants are dangerous air contaminants, except when they exist only momentarily and infrequently. Prima facie evidence as to whether such contaminants in momentary and infrequent occurrences, or other air contaminants not named in the tables or lesser concentrations than those set forth in the following tables constitute dangerous air contaminants by reason of their existence in quantities tending to injure the health of employees shall include an opinion to that effect by a physician representing the industrial commissioner. Note: TABLE I—Threshold Limit Values (T.L.V.) (in alphabetical order) TABLE II—Mineral Dusts

Note:

Petitions for variations pursuant to section 30 of the Labor Law from administrative orders issued on the basis of prima facie evidence of dangerous air contaminants will be decided by the board after review of reports of air tests and field investigations submitted to the board by the commissioner and a hearing which the petitioner will attend. The petitioner will be given opportunity to submit testimony, data and test results at the hearing to support his variation request.

TABLE I—Threshold Limit Values (T.L.V.)

(in alphabetical order)

	Substance	ppm^(a)	mg/M^3(b)
	Abate*	—	15
	Acetaldehyde	200	360
	Acetic acid	10	25
	Acetic anhydride	5	20
	Acetone	1,000	2,400
	Acetonitrile	40	70
	Acetylene dichloride, see 1,2 Dicloroethylene
	Acetylene tetrabromide	1	14
	Acrolein	0.1	0.25
	Acrylamide–skin	—	0.3
	Acrylonitrile–skin	20	45
	Aldrin–skin	—	0.25
	Allyl alcohol–skin	2	5
	Allyl chloride	1	3
C	Allyl glycidyl ether (AGE)	10	45
	Allyl propyl disulfide	2	12
	2–Aminoethanol, see Ethanolamine
	2–Aminopyridine	0.5	2
	Ammonia	50	35
	Ammonium sulfamate (Ammate)	—	15
	n–Amyl acetate	100	525
	sec–Amyl acetate	125	650
	Aniline–skin	5	19
	Anisidine (o,p–isomers)–skin	—	0.5
	Antimony & compounds (as Sb)	—	0.5
	ANTU (alpha naphthyl thiourea)	—	0.3
	Arsenic & compounds (as As)	—	0.5
	Arsine	0.05	0.2
	Azinphos–methyl–skin	—	0.2
	Barium (soluble compounds)	—	0.5
C	Benzene (benzol)–skin	25	80
	Benzidine–skin	—	A
	p–Benzoquinone, see Quinone
	Benzoyl peroxide	—	5
	Benzyl chloride	1	5
	Beryllium	—	0.002
	Biphenyl, see Diphenyl
	Boron oxide	—	15
	Boron tribromide*	1	—
C	Boron trifluoride	1	3
	Bromine	0.1	0.7
	Bromine pentafluoride*	0.1	—
	Bromoform–skin	0.5	5
	Butadiene (1, 3–butadiene)	1,000	2,200
	Butanethiol, see Butyl mercaptan
	2–Butanone	200	590
	2–Butoxy ethanol (Butyl Cellosolve)–skin	50	240
	Butyl acetate (n–butyl acetate)	150	710
	sec–Butyl acetate	200	950
	tert–Butyl acetate	200	950
	Butyl alcohol	100	300
	sec–Butyl alcohol	150	450
	tert–Butyl alcohol	100	300
C	Butylamine–skin	5	15
C	tert–Butyl chromate (as CrO ₃ )–skin	—	0.1
	n–Butyl glycidyl ether (BGE)	50	270
	Butyl mercaptan	10	35
	p–tert–Butyltoluene	10	60
	Cadmium (Metal dust and soluble salts)	—	0.2
	Cadmium oxide fume	—	0.1
	Calcium arsenate	—	1
	Calcium oxide	—	5
	Camphor*	2	—
	Carbaryl (Sevin**)	—	5
	Carbon black	—	3.5
	Carbon dioxide	5,000	9,000
	Carbon disulfide–skin	20	60
	Carbon monoxide	50	55
	Carbon tetrachloride–skin	10	65
	Chlordane–skin	—	0.5
	Chlorinated camphene–skin	—	0.5
	Chlorinated diphenyl oxide	—	0.5
	Chlorine*	1	—
	Chlorine dioxide	0.1	0.3
C	Chlorine trifluoride	0.1	0.4
C	Chloroacetaldehyde	1	3
	alpha–Chloroacetophenone (phenacylchloride)	0.05	0.3
	Chlorobenzene (monochlorobenzene)	75	350
	o–Chlorobenzylidene malononitrile (OCBM)	0.05	0.4
	Chlorobromomethane	200	1,050
	2–Chloro–1, 3 butadiene, see Chloroprene
	Chlorodiphenyl (42% Chlorine)–skin	—	1
	Chlorodiphenyl (54% Chlorine)–skin	—	0.5
	1, Chloro, 2, 3, epoxypropane, see Epichlorhydrin
	2, Chloroethanol, see Ethylene chlorohydrin
	Chloroethylene, see Vinyl chloride
C	Chloroform (trichloromethane)	50	240
	1–Chloro–1–nitropropane	20	100
	Chloropicrin	0.1	0.7
	Chloroprene (2–chloro–1, 3–butadiene)–skin	25	90
	Chromic acid and chromates (as CrO ₃ )	—	0.1
	Chromium, sol. chromic, chromous salts (as Cr)	—	0.5
	Metal and insoluble salts	—	1
	Coal tar pitch volatiles (benzene soluble fraction, anthracene, BaP, phenanthrene, acridine, chrysene, pyrene)	—	0.2
	Cobalt, metal fume and dust	—	0.1
	Copper fume	—	0.1
	Dusts and mists	—	1
	Cotton dust (raw)	—	1
	Crag** herbicide	—	15
	Cresol (all isomers)–skin	5	22
	Crotonaldehyde	2	6
	Cumene–skin	50	245
	Cyanide (as CN)–skin	—	5
	Cyanogen*	10	—
	Cyclohexane	300	1,050
	Cyclohexanol	50	200
	Cyclohexanone	50	200
	Cyclohexene	300	1,015
	Cyclopentadiene	75	200
	2, 4–D	—	10
	DDT–skin	—	1
	DDVP–skin	—	1
	Decaborane–skin	0.05	0.3
	Demeton**–skin	—	0.1
	Diacetone alcohol (4–methyl–2–pentanone)	50	240
	1, 2 Diaminoethane, see Ethyllenediamine
	Diazomethane	0.2	0.4
	Diborane	0.1	0.1
C	1, 2–Dibromoethane (ethylene dibromide)– skin	25	190
	Dibutyl phosphate	1	5
	Dibutylphthalate	—	5
C	o–Dichlorobenzene	50	300
	p–Dichlorobenzene	75	450
	Dichlorodifluoromethane	1,000	4,950
	1, 3–Dichloro–5, dimethyl hydantoin	—	0.2
	1, 1–Dichloroethane	100	400
	1, 2–Dichloroethane	50	200
	1, 2–Dichloroethylene	200	790
C	Dichloroethyl ether–skin	15	90
	Dichloromethane, see Methylenechloride
	Dichloromonofluoromethane	1,000	4,200
C	1, 1–Dichloro–1–nitroethane	10	60
	1, 2–Dichloropropane, see Propylenedichloride
	Dichlorotetrafluoroethane	1,000	7,000
	Dieldrin–skin	—	0.25
	Diethylamine	25	75
	Diethylamino ethanol–skin	10	50
C	Diethylene triamine–skin	10	—
	Diethylether, see Ethyl ether
	Difluorodibromomethane	100	860
C	Diglycidyl ether (DGE)	5.5	2.8
	Dihydroxybenzene, see Hydroquinone
	Diisobutyl ketone	50	290
	Diisopropylamine–skin	5	20
	Diphenyl amine*	—	10
	Dimethoxymethane, see Methylal
	Dimethyl acetamide–skin	10	35
	Dimethylamine	10	18
	Dimethylaminobenzene, see Xylidene
	Dimethylaniline (N–dimethylaniline)–skin	5	25
	Dimethylbenzene, see Xylene
	Dimethyl, 1, 2–dibromo–2, 2–dichloroethyl, (Dibrom)	—	3
	Dimethylformamide–skin	10	30
	2, 6 Dimethylheptanone, see Diisobutyl ketone
	1, 1–Dimethylhydrazine–skin	0.5	1
	Dimethylphthalate	—	5
	Dimethylsulfate–skin	1	5
	Dinitrobenzene (all isomers)–skin	—	1
	Dinitro–o–cresol–skin	—	0.2
	Dinitrotoluene–skin	—	1.5
	Dioxane (Diethylene dioxide)–skin	100	360
	Diphenyl	0.2	1
	Diphenyl Amine*	—	10
	Diphenylmethane diisocyanate (see Methylene bisphenyl isocyanate) (MDI)
	Dipropylene glycol methyl ether–skin	100	600
	Di–sec, octyl phthalate (Di–2–ethylhexylphthalate)	—	5
	Endrin–skin	—	0.1
	Epichlorhydrin–skin	5	19
	EPN–skin	—	0.5
	1, 2–Epoxypropane, see Propyleneoxide
	2, 3–Epoxy–1–propanol, see Glycidol
	Ethanethiol, see Ethylmercaptan
	Ethanolamine	3	6
	2 Ethoxyethanol–skin	200	740
	2 Ethoxyethylacetate (Cellosolve acetate)–skin	100	540
	Ethyl acetate	400	1,400
	Ethyl acrylate–skin	25	100
	Ethyl alcohol (ethanol)	1,000	1,900
	Ethylamine	10	18
	Ethyl sec–amyl ketone (5–methyl–3–heptanone)	25	130
	Ethyl benzene	100	435
	Ethyl bromide	200	890
	Ethyl butyl ketone (3–Heptanone)	50	230
	Ethyl chloride	1,000	2,600
	Ethyl ether	400	1,200
	Ethyl formate	100	300
	Ethyl mercaptan	10	25
	Ethyl silicate	100	850
	Ethylene chlorohydrin–skin	5	16
	Ethylenediamine	10	25
	Ethylene dibromide, see 1, 2–Dibromoethane
	Ethylene dichloride, see 1, 2–Dichloroethane
C	Ethylene glycol dinitrate and/or Nitrogylcerin– skin	0.2(d)	1
	Ethylene glycol monomethyl ether acetate, see Methyl cellosolve acetate
	Ethylene imine–skin	0.5	1
	Ethylene oxide	50	90
	Ethylidine chloride, see 1, 1–Dichloroethane
	N–Ethylmorpholine–skin	20	94
	Ferbam	—	15
	Ferrovanadium dust	—	1
	Fluoride (as F)	—	2.5
	Fluorine	0.1	0.2
	Fluorotrichloromethane	1,000	5,600
C	Formaldehyde	5	6
	Formic acid	5	9
	Furfural–skin	5	20
	Furfuryl alcohol	50	200
	Gasoline	—	A
	Gylcidol (2, 3–Epoxy–1–propanol)	50	150
	Gylcol monoethyl ether, see 2–Ethoxyethanol
	Guthion**, see Azinphosmethyl
	Hafnium	—	0.5
	Heptachlor–skin	—	0.5
	Heptane (n–heptane)	500	2,000
	Hexachloroethane–skin	1	10
	Hexachloronaphthalene–skin	—	0.2
	Hexane (n–hexane)	500	1,800
	2–Hexanone	100	410
	Hexone	100	410
	sec–Hexyl acetate	50	300
	Hydrazine–skin	1	1.3
	Hydrogen bromide	3	10
C	Hydrogen chloride	5	7
	Hydrogen cyanide–skin	10	11
	Hydrogen fluoride	3	2
	Hydrogen peroxide, 90%	1	1.4
	Hydrogen selenide	0.05	0.2
	Hydrogen sulfide	10	15
	Hydroquinone	—	2
	Indium and compounds (as In)*	—	0.1
C	Iodine	0.1	1
	Iron oxide fume	—	10
	Iron salts, soluble (as Fe)*	—	1
	Isoamyl acetate	100	525
	Isoamyl alcohol	100	360
	Isobutyl acetate	150	700
	Isobutyl alcohol	100	300
	Isophorone	25	140
	Isopropyl acetate	250	950
	Isopropyl alcohol	400	980
	Isopropylamine	5	12
	Isopropylether	500	2,100
	Isopropyl glycidyl ether (IGE)	50	240
	Ketone	0.5	0.9
	Lead	—	0.2
	Lead arsenate	—	0.15
	Lindane–skin	—	0.5
	Lithium hydride	—	0.025
	L.P.G. (Liquified petroleum gas)	1,000	1,800
	Magnesium oxide fume	—	15
	Malathion–skin	—	15
	Maleic anhydride	0.25	1
C	Manganese	—	5
	Mercury–skin	—	0.1
	Mercury (organic compounds)–skin	—	0.01
	Mesityl oxide	25	100
	Methanethiol, see Methyl mercaptan
	Methoxychlor	—	15
	2–Methoxyethanol, see Methyl cellosolve
	Methyl acetate	200	610
	Methyl acetylene (propyne)	1,000	1,650
	Methyl acetylene–propadiene mixture (MAPP)	1,000	1,800
	Methyl acrylate–skin	10	35
	Methylal (dimethoxymethane)	1,000	3,100
	Methyl alcohol (methanol)	200	260
	Methylamine	10	12
	Methyl amyl alcohol, see Methyl isobutyl carbinol
	Methyl (n–amyl) ketone (2–Heptanone)	100	465
C	Methyl bromide–skin	20	80
	Methyl butyl ketone, see 2–Hexanone
	Methyl cellosolve–skin	25	80
	Methyl cellosolve acetate–skin	25	120
C	Methyl chloride	100	210
	Methyl chloroform	350	1,900
	Methylcyclohexane	500	2,000
	Methylcyclohexanol	100	470
	o–Methylcyclohexanone–skin	100	460
	Methyl ethyl ketone (MEK), see 2–Butanone
	Methyl formate	100	250
	Methyl iodide–skin	5	28
	Methyl isobutyl carbinol–skin	25	100
	Methyl isobutyl ketone, see Hexone
	Methyl isocyanate–skin	0.22	0.05
C	Methyl mercaptan	10	20
	Methyl methacrylate	100	410
	Methyl propyl ketone, see 2–Pentanone
C	Methyl silicate*	5	—
C	alpha–Methyl styrene	100	480
C	Methylene bisphenyl isocyanate (MDI)	0.02	0.2
	Methylene chloride (dichloromethane)	500	1,740
	Molybdenum (soluble compounds)	—	5
	(insoluble compounds)	—	15
	Monomethyl aniline–skin	2	9
C	Monomethyl hydrazine–skin	0.2	0.35
	Morpholine–skin	20	70
	Naphtha (coal tar)	100	400
	Naphthalene	10	50
	beta–Naphthylamine	—	A
	Nickel carbonyl	0.001	0.007
	Nickel, metal and soluble compounds	—	1
	Nicotine–skin	—	0.5
	Nitric acid	2	5
	Nitric oxide	25	30
	p–Nitroaniline–skin	1	6
	Nitrobenzene–skin	1	5
	p–Nitrochloro–benzene–skin	—	1
	Nitroethane	100	310
C	Nitrogen dioxide	5	9
	Nitrogen Trifluoride	10	29
C	Nitroglycerin–skin	0.2	2
	Nitromethane	100	250
	1–Nitropropane	25	90
	2–Nitropropane	25	90
	N–Nitrosodimethyl–amine (Dimethyl–nitrosoamine)–skin	—	A
	Nitrotoluene–skin	5	30
	Nitrotrichloromethane, see Chloropicrin
	Octachloronaphthalene–skin	—	0.1
	Octane	500	2,350
	Oil mist (mineral)	—	5
	Osmium tetroxide	—	0.002
	Oxalic acid	—	1
	Oxygen difluoride	0.05	0.1
	Ozone	0.1	0.2
	Paraquat–skin	—	0.5
	Parathion–skin	—	0.1
	Pentaborane	0.005	0.01
	Pentachloronaphthalene–skin	—	0.5
	Pentachlorophenol–skin	—	0.5
	Pentane	1,000	2,950
	2–Pentanone	200	700
	Perchloroethylene	100	670
	Perchloromethyl mercaptan	0.1	0.8
	Perchloryl fluoride	3	13.5
	Petroleum Distillates (naphtha)	500	2,000
	Phenol–skin	5	19
	p–Phenylene diamine–skin	—	0.1
	Phenyl ether (vapor)	1	7
	Phenyl ether–Biphenyl mixture (vapor)	1	7
	Phenylethylene, see Styrene
	Phenyl glycidyl ether (PGE)	10	60
	Phenylhydrazine–skin	5	22
	Phosdrln (Mevinphos**)–skin	—	0.1
	Phosgene (carbonyl chloride)	0.1	0.4
	Phosphine	0.3	0.4
	Phosphoric acid	—	1
	Phosphorus (yellow)	—	0.1
	Phosphorus pentachloride	—	1
	Phosphorus pentasulfide	—	1
	Phosphorus trichloride	0.5	3
	Phthalic anhydride	2	12
	Picric acid–skin	—	0.1
	Pival** (2–Pivalyl–1, 3–indandione)	—	0.1
	Platinum (soluble salts)	—	0.002
	Polytetrafluoroethylene decomposition products	—	A²
	Propane	1,000	1,800
	beta–Propiolactone	—	A¹
	Propargyl alcohol–skin*	1	—
	n–Propyl acetate	200	840
	Propyl alcohol	200	500
	n–Propyl nitrate	25	110
	Propylene dichloride	75	350
	Propylene imine–skin	2	5
	Propylene oxide	100	240
	Propyne, see Methylacetylene
	Pyrethrum	—	5
	Pyridine	5	15
	Quinone	0.1	0.4
	RDX–skin*	—	1.5
	Rhodium, Metal fume and dusts	—	0.1
	Soluble salts	—	0.001
	Ronnel	—	15
	Rotenone (commercial)	—	5
	Selenium compounds (as Se)	—	0.2
	Selenium hexafluoride	0.05	0.4
	Silver, Metal and soluble compounds	—	0.01
	Sodium fluoroacetate (1080)–skin	—	0.05
	Sodium hydroxide	—	2
	Stibine	0.1	0.5
	Stoddard solvent	500	2,900
	Strychnine	—	0.15
C	Styrene monomer (phenylethylene)	100	420
	Sulfur dioxide	5	13
	Sulfur hexafluoride	1,000	6,000
	Sulfuric acid	—	1
	Sulfur monochloride	1	6
	Sulfur pentafluoride	0.025	0.25
	Sulfuryl fluoride	5	20
	Systox, see Demeton**
	2, 4, 5, T	—	10
	Tantalum	—	5
	TEDP–skin	—	0.2
	Teflon** decomposition products	—	A²
	Tellurium	—	0.1
	Tellurium hexafluoride	0.02	0.2
	TEPP–skin	—	0.05
C	Terphenyls	1	9
	1, 1, 1, 2–Tetrachloro–2, 2–difluoroethane	500	4,170
	1, 1, 2, 2–Tetrachloro–1, 2–difluoroethane	500	4,170
	1, 1, 2, 2–Tetrachloroethane–skin	5	35
	Tetrachloroethylene, see Perchloroethylene
	Tetrachloromethane, see Carbon tetrachloride
	Tetrachloronaphthalene–skin	—	2
	Tetraethyl lead (as Pb)–skin	—	0.075
	Tetrahydrofuran	200	590
	Tetramethyl lead (TML) (as Pb)–skin	—	0.075
	Tetramethyl succinonitrile–skin	0.5	3
	Tetranitromethane	1	8
	Tetryl (2, 4, 6–trinitrophenylmethylnitramine)–skin	—	1.5
	Thallium (soluble compounds)–skin	—	0.1
	Thiram	—	5
	Tin (inorganic compounds, except SnH ₄ and SnO ₂ )	—	2
	Tin (organic compounds)	—	0.1
	Titanium dioxide	—	15
	Toluene (toluol)	200	750
C	Toluene–2, 4–diisocyanate	0.02	0.14
	o–Toluidine–skin	5	22
	Toxaphene, see Chlorinated camphene
	Tributyl phosphate	—	5
	1, 1, 1–Trichloroethane, see Methyl chloroform
	1, 1, 2–Trichloroethane–skin	10	45
	Trichloroethylene	100	535
	Trichloromethane, see Chloroform
	Trichloronaphthalene–skin	—	5
	1, 2, 3–Trichloropropane	50	300
	1, 1, 2–Trichloro 1, 2, 2–trifluoroethane	1,000	7,600
	Triethylamine	25	100
	Trifluoromonobromomethane	1,000	6,100
	2, 4, 6–Trinitrophenol, see Picric acid
	2, 4, 6–Trinitrophenylmethylnitramine, see Tetryl
	Trinitrotoluene–skin	—	1.5
	Triorthocresyl phosphate	—	0.1
	Triphenyl phosphate	—	3
	Tungsten and compounds, as W soluble*	—	1
	Insoluble	—	5
	Turpentine	100	560
	Uranium (natural), soluble and insoluble compounds, (as U)*	—	0.2
C	Vanadium (V ₂ O ₅ dust)	—	0.5
	(V ₂ O ₅ fume)	—	0.1
	Vinyl benzene, see Styrene
C	Vinyl chloride	500	1,300
	Vinylcyanide, see Acrylonitrile
	Vinyl toluene	100	480
	Warfarin	—	0.1
	Xylene (xylol)	100	435
	Xylidine–skin	5	25
	Yttrium	—	1
	Zinc chloride fume	—	1
	Zinc oxide fume	—	5
	Zirconium compounds (as Zr)	—	5

____