bannerImg

Exposure Limits for Air Contaminants

Quick Tips #232
References:

NIOSH Pocket Guide to Chemical Hazards, NIOSH, 2005

Definitions:

TLV (threshold limit value)-An estimate of the average safe airborne concentration of a substance in representative conditions under which it is believed that nearly all workers may be repeatedly exposed day after day without adverse effect. TLVs are published annually by the American Conference of Governmental Industrial Hygienists (ACGIH).

PEL (permissible exposure limit)-The OSHA limits of employee exposure to chemicals; found primarily in 29 CFR 1910.1000, table Z-1.

STEL (short term exposure limit)-The maximum concentration for a continuous 15-minute exposure period. Ceiling is the maximum allowable concentration to which an employee may be exposed.

IDLH (immediately dangerous to life and health)-The concentration of an airborne chemical which may cause irreversible health effects or death. NIOSH

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Acetaldehyde - 200 25 ACGIH 2000 ++
Acetic acid 10 10 15 ACGIH 50
Acetic anhydride 5 5 5 NIOSH 200
Acetone 500 1000 750 ACGIH 2500
Acetonitrile 20 40 - 500
Acetylene tetrabromide (1,1,2,2 Tetrabromoethane) 0.1 1 - 8
Acrolein - 0.1 0.1 ACGIH 2
Acrylamide 0.03 0.3 mg/m3 - 60 mg/m3++
Aldrin 0.05 0.25 mg/m3 - 25 mg/m3++
Allyl alcohol 0.5 2 4 NIOSH 20
Allyl chloride 1 1 2 ACGIH / NIOSH 250
Allyl glycidyl ether 1 10 + 10 NIOSH 50
Allyl propyl disulfide 0.5 2 3 NIOSH -
Alpha-alumina (td) - 15 mg/m3 - -
Alpha-alumina (rf) - 5 mg/m3 - -
Aluminum, metal (td) - 15 mg/m3 - -
Aluminum metal (rf) 1 mg/m3 5 mg/m3 - -
2-aminopyridine 0.5 0.5 - 5
Ammonia 25 50 35 ACGIH / NIOSH 300
Ammonium sulfamate (td) 10 mg/m3 15 mg/m3 - 1500 mg/m3
Ammonium sulfamate (rf) - 5 mg/m3 - -
n-amyl acetate (1-Pentyl acetate) 50 100 100 ACGIH 1000
sec-amyl acetate (2-Pentyl acetate) 50 125 100 ACGIH 1000
Aniline and homologs 2 5 - 100 ++
Anisidine o-, p-isomers 0.1 0.5 mg/m3 - 50 mg/m3 ++
Antimony & compounds 0.5 mg/m3 0.5 mg/m3 - 50 mg/m3
ANTU 0.3 mg/m3 0.3 mg/m3 - 100 mg/m3
Arsenic, org. comp. 0.01 mg/m3 0.5 mg/m3 - -
Arsine 0.005 0.05 0.002 mg/m3 NIOSH 3 ++
Azinphos-methyl 0.2 mg/m3 0.2 mg/m3 - 10 mg/m3

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Barium, sol. comp. 0.5 mg/m3 0.5 mg/m3 - 50 mg/m3
Barium sulfate (td) 10 mg/m3 15 mg/m3 - -
Barium sulfate (rf) - 5 mg/m3 - -
Benomyl (td) 10 mg/m3 15 mg/m3 - -
Benomyl (rf) - 5 mg/m3 - -
Benzene *See 29 CFR 1910.1028 0.5 1* 5* OSHA
2.5 ACGIH
1 NIOSH
500 ++
Benzoyl peroxide 5 mg/m3 5 mg/m3 - 1500 mg/m3
Benzyl chloride 1 1 1 / 15min NIOSH 10
Beryllium 0.002 mg/m3 0.002 mg/m3 0.005 ; 0.025 30 min. peak/8 hr. shift OSHA
0.0005 mg/m3 NIOSH
4 mg/m3 ++
Bismuth telluride undoped (td) 10 mg/m3 15 mg/m3 - -
Bismuth telluride undoped (rf) - 5 mg/m3 - -
Boron oxide (td) 10 mg/m3 15 mg/m3 - 2000 mg/m3
Boron trifluoride - - 1.0 NIOSH, OSHA, ACGIH 25
Bromine 0.1 0.1 0.2 ACGIH
0.3 NIOSH
3
Bromoform 0.5 0.5 - 850
1,3 butadiene 2 1 5 OSHA 2000 ++ (LEL)
2-butanone (MEK) 200 200 300 ACGIH / NIOSH 3000
2-butoxyethanol 20 50 - 700
n-butyl-acetate 150 150 200 ACGIH / NIOSH 1700 (LEL)
sec-butyl acetate 200 200 - 1700 (LEL)
tert-butyl acetate 200 200 - 1500 (LEL)
n-Butyl alcohol (n-butanol) 20 100 50 NIOSH 1400 (LEL)
sec-Butyl alcohol (sec-butanol) 100 150 150 NIOSH 2000
tert-Butyl alcohol (tert-butanol) 100 100 150 NIOSH 1600
Butylamine 5 + 5 + 5 NIOSH 300
tert-butyl chromate See 29 CFR 1910.1026 - - 0.1 mg/m3 ACGIH, OSHA 15 mg/m3 ++
n-butyl glycidyl ether 3 50 5.6 /15 min. NIOSH 250
Butyl mercaptan 0.5 10 0.5 /15 min. NIOSH 500
p-tert-butyl-1-toluene 1 10 20 NIOSH 100

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Cadmium fume See 29 CFR 1910.1027 - 0.3 mg/m3 - 9 mg/m3 ++
Cadmium dust See 29 CFR 1910.1027 - 0.3 mg/m3  - 9 mg/m3 ++
Calcium carbonate (td) (limestone) - 15 mg/m3 - -
Calcium carbonate (rf) - 5 mg/m3 - -
Calcium hydroxide (td) 5 mg/m3 15 mg/m3 - -
Calcium hydroxide (rf) - 5 mg/m3 - -
Calcium oxide 2 mg/m3 5 mg/m3 - 25 mg/m3
Calcium silicate (td) 10 mg/m3 15 mg/m3 - -
Calcium silicate (rf) - 5 mg/m3 - -
Calcium sulfate (td) 10 mg/m3 15 mg/m3 - -
Calcium sulfate (rf) - 5 mg/m3 - -
Camphor, synthetic 12 mg/m3 2 mg/m3 19 mg/m3 ACGIH 200 mg/m3
Carbaryl 5 mg/m3 5 mg/m3 - 100 mg/m3
Carbon black 3.5 mg/m3 3.5 mg/m3 - 1750 mg/m3 ++
Carbon dioxide 5000 5000 30,000 ACGIH / NIOSH 40,000
Carbon disulfide 1 20 10 NIOSH 500
Carbon monoxide 25 50 200 NIOSH 1200
Carbon tetrachloride 5 10 10 ACGIH
2 / 60 min. NIOSH
200 ++
Cellulose (td) 10 mg/m3 15 mg/m3 - -
Cellulose (rf) - 5 mg/m3 - -
Chlorodane 0.5 mg/m3 0.5 mg/m3 - 100 mg/m3++
Chlorinated camphene 0.5 mg/m3 0.5 mg/m3 - 200 mg/m3++
Chlorinated diphenyl oxide 0.5 mg/m3 0.5 mg/m3 - 5 mg/m3
Chlorine 0.5 - 1 ACGIH/OSHA
0.5 NIOSH
10
Chlorine dioxide 0.1 0.1 0.3 ACGIH / NIOSH 5
Chlorine trifluoride 0.1 + 0.1 + 0.1 NIOSH 20
Chloroacetaldehyde 1 + 1 + 1 NIOSH 45
a-chloroacetophenone 0.05 0.05 - 15 mg/m3
Chlorobenzene 10 75 - 1000
o-chlorobenzylidene malononitrile 0.05+ 0.05 0.05 NIOSH 2 mg/m3
Chlorobromomethane 200 200 - 2000
Chlorodiphenyl (42% Cl) 1 mg/m3 1 mg/m3 - 5 mg/m3++
Chlorobiphenyl (54% Cl) 0.5 mg/m3 0.5 mg/m3 - 5 mg/m3++
Chloroform 10 50+ 2 /60 min. NIOSH 500 ++
1-chloro-1-nitro- propane 2 20 - 100
Chloropicrin 0.1 0.1 - 2
beta-chloroprene 10 25 1 / 15 min. NIOSH 300
Chromic acids and chromate 0.05 mg/m3 0.1 mg/m3+ - 15 mg/m3 ++
Chromium (II) compounds - 0.5 mg/m3 - 250 mg/m3
Chromium (III) compounds 0.5 mg/m3 0.5 mg/m3 - 25 mg/m3
Chromium metal and insoluble salts - 1 mg/m3 - 250 mg/m3
Clopidol (td) 10 mg/m3 15 mg/m3 - -
Clopidol (rf) - 5 mg/m3 - -
Coal dust (less than 5% SiO (2) anthracite) 0.4 mg/m3 2.4 mg/m3 - -
Coal dust (greater or equal to 5% SiO(2) bituminous) 0.9 mg/m3 10 mg/m3 - -
Coal tar pitch volatiles 0.2 mg/m3 0.2 mg/m3 - 80 mg/m3++
Cobalt metal, dust and fume 0.02 mg/m3 0.1 mg/m3 - 20 mg/m3
Copper fume 0.2 mg/m3 0.1 mg/m3 0.1 mg/m3 ACGIH 100 mg/m3
Copper dusts and mists 1 mg/m3 1 mg/m3 - 100 mg/m3
Cotton dust 0.2 mg/m3 1 mg/m3 - 100 mg/m3
Crag herbicide (td) (sesone) 10 mg/m3 15 mg/m3 - 500 mg/m3
Crag herbicide (rf) - 5 mg/m3 - -
Cresol, all isomers 5 5 - 250
Crotonaldehyde 0.3 + 2 - 50
Cumene 50 50 - 900 (LEL)
Cyanides - 5 mg/m3 - 25 mg/m3
Cyclohexane 100 300 - 1300 (LEL)
Cyclohexanol 50 50 - 400
Cyclohexanone 20 50 - 700
Cyclohexene 300 300 - 2000
Cyclopentadiene 75 75 - 750

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
2,4-D (Dichlorophenoxyacetic acid) 10 mg/m3 10 mg/m3 - 100 mg/m3
Decaborane 0.05 0.05 0.15 ACGIH / NIOSH 15 mg/m3
Demeton 0.05 mg/m3 0.1 mg/m3 - 10 mg/m3
Diacetone alcohol 50 50 - 1800 (LEL)
Diazomethane 0.2 0.2 - 2
Diborane 0.1 0.1 - 15
Dibutyl phosphate 1 1 2 ACGIH / NIOSH 30
Dibutyl phthalate 5 mg/m3 5 mg/m3 - 4000 mg/m3
o-dichlorobenzene 25 50+ 50 ACGIH / NIOSH 200
p-dichlorobenzene 10 75 - 150 ++
Dichlorodifluoromethane 1000 1000 - 15,000
1,3 dichloro 5,5 dimethyl hydantoin 0.2 mg/m3 0.2 mg/m3 - 5 mg/m3
Dichlorodiphenyltri-chloroethane (DDT) 1 mg/m3 1 mg/m3 - 500 mg/m3 ++
1,1 dichloroethane 100 100 - 3000
1,2-dichloroethylene 200 200 - 1000
Dichloroethyl ether 5 15 + 10 ACGIH / NIOSH 100 ++
Dichloromono- fluomethane (dichlorofluoromethane) 10 1000 - 5000
1,1 Dichloro-1- nitroethane 2 10 + - 25
Dichlorotetra- fluoroethane 1000 1000 - 15,000
Dichlorvos (DDVP) 0.1 mg/m3 1 mg/m3 - 100 mg/m3
Dicyclopentadienyl iron (td) 10 mg/m3 15 mg/m3 - -
Dicyclopentadienyl iron (rf) - 5 mg/m3 - -
Dieldrin 0.25 mg/m3 0.25 mg/m3 - 50 mg/m3++
Diethylamine 5 25 15 ACGIH
12 NIOSH
200
2-diethylaminoethanol 2 10 - 100
Difluorodibromomethane 100 100 - 2000
Diglycidyl ether (DGE) 0.01 0.5 + - 10 ++
Diisobutyl ketone 25 50 - 500
Diisopropylamine 5 5 - 200
Dimethyl acetamide 10 10 - 300
Dimethylamine 5 10 15 ACGIH 500
Dimethylaniline (N,N-dimethylaniline) 5 5 10 ACGIH / NIOSH 100
Dimethyl-1,2-dibromo- 2,2-dichloroethyl phosphate (NALED) 0.1 mg/m3 3 mg/m3 - 200 mg/m3
Dimethylformamide 10 10 - 500
1,1-dimethylhydrazine 0.01 0.5 0.06/120 min. NIOSH 15++
Dimethylphthalate 5 mg/m3 5 mg/m3 - 2000 mg/m3
Dimethyl sulfate 0.1 1 - 7++
Dinitrobenzene (all isomers) 0.15 1 mg/m3 - 50 mg/m3
Dinitro-o-cresol 0.2 mg/m3 0.2 mg/m3 - 5 mg/m3
Dinitrotoluene 0.2 mg/m3 1.5 mg/m3 - 50 mg/m3++
Dioxane (diethylene dioxide) 20 100 1/30 min. NIOSH 500 ++
Diphenyl (biphenyl) 0.2 0.2 - 100 mg/m3
Dipropylene glycol methyl ether DPGME
[2-(methoxymethylethoxy) propanol]
100 100 150 ACGIH / NIOSH 600
Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate) DEHP 5 mg/m3 5 mg/m3 - 5000 mg/m3

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Emery (td) - 15 mg/m3 - -
Emery (rf) - 5 mg/m3 - -
Endosulfan 0.1 mg/m3 - - -
Endrin 0.1 mg/m3 0.1 mg/m3 - 2 mg/m3
Epichlorohydrin 0.5 5 - 75++
EPN 0.1 mg/m3 0.5 mg/m3 - 5 mg/m3
Ethanolamine 3 3 6 ACGIH / NIOSH 30
2-ethoxyethanol (cellosolve) 5 200 - 500
2-ethoxyethyl acetate (cellosolve acetate) 5 100 - 500
Ethyl acetate 400 400 - 2000 (LEL)
Ethyl acrylate 5 25 15 ACGIH 300 ++
Ethyl alcohol (ethanol) 1000 1000 - 3300 (LEL)
Ethylamine 5 10 15 ACGIH 600
Ethyl amyl ketone (5- methyl-3-heptanone) 10 25 - -
Ethyl benzene 100 100 125 ACGIH / NIOSH 800 (LEL)
Ethyl bromide 5 200 - 2000
Ethyl butyl ketone (3- heptanone) 50 50 75 ACGIH 1000
Ethyl chloride 100 1000 - 3800 (LEL)
Ethyl ether 400 400 500 ACGIH 1900
Ethyl formate 100 100 - 1500
Ethyl mercaptan 0.5 10 + 0.5/15 min. NIOSH 500
Ethyl silicate 10 100 - 700
Ethylene chlorohydrin 1 + 5 1 NIOSH 7
Ethylenediamine 10 10 - 1000
Ethylene dibromide - 20 30; 50/5 min. peak 8 hr. OSHA
0.13/15 min. NIOSH
100 ++
Ethylene dichloride 10 50 2 NIOSH 50 ++
Ethylene glycol dinitrate 0.05 0.2 + - 75 mg/m3
N-ethylmorpholine 5 20 - 100

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Ferbam (td) 10 mg/m3 15 mg/m3 - 800 mg/m3
Ferrovanadium dust 1 mg/m3 1 mg/m3 3 mg/m3 ACGIH / NIOSH 500 mg/m3
Fluorides (as f) 2.5 mg/m3 2.5 mg/m3 - 250 mg/m3
Fluorine 1 0.1 2 ACGIH 25
Fluorotrichloromethane (trichlorofluoromethane) 1000 + 1000 1000 NIOSH 2000
Formaldehyde See 29 CFR 1910.1048 0.3 + 0.75 0.1/15 min. NIOSH 20 ++
Formic acid 5 5 10 ACGIH 30
Furfural 2 5 - 100
Furfuryl alcohol 10 50 15 ACGIH / NIOSH 75

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Glycerin (td) 10 mg/m3 15 mg/m3 - -
Glycerin (rf) - 5 mg/m3 - -
Glycidol 2 50 - 150
Grain dust (oat, wheat, barley) 4 mg/m3 10 mg/m3 - -
Graphite, natural 2 mg/m3 15 mg/m3 - 1250 mg/m3
Graphite, synthetic (td) 2 mg/m3 15 mg/m3 - -
Graphite, synthetic (rf) - 5 mg/m3 - -
Gypsum (td) - 15 mg/m3 - -
Gypsum (rf) - 5 mg/m3 - -

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Hafnium 0.5 mg/m3 0.5 mg/m3 - 50 mg/m3
Heptachlor 0.05 mg/m3 0.5 mg/m3 - 35 mg/m3 ++
Heptane (n-heptane) 400 500 500 ACGIH
440 / 15 min. NIOSH
750
Hexachloroethane 1 1 - 300++
Hexachloronaph- thalene 0.2 mg/m3 0.2 mg/m3 - 2 mg/m3
n-hexane 50 500 - 1100 (LEL)
2-hexanone (methyl n-butyl ketone) 5 100 10 ACGIH 1600
Hexone (methyl isobutyl ketone) 50 100 75 ACGIH / NIOSH 500
sec-hexyl acetate 50 50 - 500
Hydrazine 0.01 1 0.03 / 120 min. NIOSH 50 ++
Hydrogen bromide 2 + 3 3 NIOSH 30
Hydrogen chloride 2 + 5 + 5 NIOSH 50
Hydrogen cyanide 4.7+ 10 4.7 NIOSH 50
Hydrogen fluoride 0.5 3 2 ACGIH
6 / 15 min. NIOSH
30
Hydrogen peroxide 1 1 - 75
Hydrogen selenide (as Se) 0.05 0.05 - 1
Hydrogen sulfide 10 20+ 15 ACGIH
10 NIOSH
100
Hydroquinone 1 mg/m3 2 mg/m3 2 mg/m3 / 15 min. NIOSH 50 mg/m3

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Iodine 0.1 + 0.1 + 0.1 NIOSH 2
Iron oxide fume 5 mg/m3 10 mg/m3 - 2500 mg/m3
Isoamyl acetate (isopentyl acetate) 50 100 100 ACGIH 1000
Isoamyl alcohol (primary and secondary) 100 100 125 ACGIH / NIOSH 500
Isobutyl acetate 150 150 - 1300 (LEL)
Isobutyl alcohol 50 100 - 1600
Isophorone 5 + 25 - 200
Isopropyl acetate 100 250 200 ACGIH 1800
Isopropyl alcohol (2-propanol) 200 400 400 ACGIH
500 NIOSH
2000 (LEL)
Isopropylamine 5 5 10 ACGIH 750
Isopropyl ether 250 500 310 ACGIH 1400 (LEL)
Isopropyl glycidyl ether (IGE) 50 50 75 ACGIH
50 / 15 min. NIOSH
400

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Kaolin (td) 2 mg/m3 15 mg/m3 - -
Kaolin (rf) - 5 mg/m3 - -
Ketene 0.5 0.5 1.5 ACGIH / NIOSH 5
Limestone (td) - 15 mg/m3 - -
Limestone (rf) - 5 mg/m3 - -
Lindane 0.5 mg/m3 0.5 mg/m3 - 50 mg/m3
Lithium hydride 0.025 mg/m3 0.025 mg/m3 - 0.5 mg/m3
L.P.G. (liquefied petroleum gas) 1000 1000 - 2000 (LEL)

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Magnesite (td) - 15 mg/m3 - -
Magnesite (rf) - 5 mg/m3 - -
Magnesium oxide fume (total particulate) 10 mg/m3 15 mg/m3 - 750 mg/m3
Malathion (td) 1 mg/m3 15 mg/m3 - 250 mg/m3
Maleic anhydride 0.1 0.25 - 10 mg/m3
Manganese compounds (as Mn) 0.2 mg/m3 5 mg/m3+ 3 mg/m3 NIOSH 500 mg/m3
Manganese fume (as Mn) 0.2 mg/m3 5 mg/m3+ 3 mg/m3 NIOSH 500 mg/m3
Marble (td) - 15 mg/m3 - -
Marble (rf) - 5 mg/m3 - -
Mercury (aryl and inorganic) 0.025 mg/m3 0.1 mg/m3+ 0.1 mg/m3 OSHA/ NIOSH 10 mg/m3
Mercury (organo) alkyl compounds 0.1 mg/m3 0.1 mg/m3+ 0.1 mg/m3 OSHA/ NIOSH 2 mg/m3
Mercury (vapor) 0.025 mg/m3 0.1 mg/m3+ 0.1 mg/m3 OSHA/ NIOSH -
Mesityl oxide 15 25 25 1400 (LEL)
Methoxychlor (td) 10 mg/m3 15 mg/m3 - 5000 mg/m3++
2-methoxyethanol (methyl cellosolve) 0.1 25 - 200
2-methoxyethyl acetate (methyl cellosolve acetate) 0.1 25 - 200
Methyl acetate 200 200 250 ACGIH / NIOSH 3100 (LEL)
Methyl acetylene (propyne) 1000 1000 - 1700 (LEL)
Methyl acetylene- propadiene mixture (MAPP) 1000 1000 1250 ACGIH / NIOSH 3400 (LEL)
Methyl acrylate 2 10 - 250
Methylal (dimetoxy- methane) 1000 1000 - 2200 (LEL)
Methyl alcohol 200 200 250 ACGIH / NIOSH 6000
Methylamine 5 10 15 ACGIH 100
Methyl n-amyl ketone 50 100 - 800
Methyl bromide 1 20 + - 250++
Methyl chloride 50 100 100 ACGIH 2000 ++
Methyl chloroform (1,1,1- trichloroethane) 350 350 450 ACGIH
350 NIOSH
700
Methylcyclohexane 400 500 - 1200 (LEL)
Methylcyclohexanol 50 100 - 500
o-methylcyclohexanone 50 100 75 ACGIH / NIOSH 600
Methylene chloride (dichloromethane) See 29 CFR 1910.1003 50 25 - 2300
Methylene bisphenyl isocyanate (MDI) 0.005 0.02+ 0.02 NIOSH 75 mg/m3
Methyl formate 100 100 150 ACGIH / NIOSH 4500
Methyl hydrazine (Mono- methyl hydrazine) 0.01 0.2+ 0.4 NIOSH 20++
Methyl iodide 2 5 - 100++
Methyl isoamyl ketone 50 100 - -
Methyl isobutyl carbinol 25 25 40 ACGIH / NIOSH 400
Methyl isocyanate 0.02 0.02 - 3
Methyl mercaptan 0.5 10 + 0.5 / 15 min. NIOSH 150
Methyl methacrylate 50 100 100 ACGIH 1000
alpha-methyl styrene 50 100 + 100 ACGIH / NIOSH 700
Molybdenum (as Mo) soluble compounds 0.5 mg/m3 5 mg/m3 - 1000 mg/m3
Molybdenum (as Mo) insoluble compounds (td) 10 mg/m3 I
3 mg/m3 R
15 mg/m3 - 5000 mg/m3
Monomethyl aniline (N-methyl aniline) 0.5 2 - 100
Morpholine 20 20 30 NIOSH 1400 (LEL)

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Naphtha (coal tar) 400 100 - 1000 (LEL)
Naphthalene 10 10 15 ACGIH / NIOSH 250
Nickel carbonyl (as Ni) 0.05 0.001 - 2++
Nickel, metal and insoluble compounds (as Ni) 0.2 mg/m3 1 mg/m3 - 10 mg/m3++
Nickel, soluble compounds (as Ni) 0.1 mg/m3 1 mg/m3 - ++
Nicotine 0.5 mg/m3 0.5 mg/m3 - 5 mg/m3
Nitric acid 2 2 4 ACGIH / NIOSH 25
Nitric oxide 25 25 - 100
p-nitroaniline 3 mg/m3 1 - 300 mg/m3
Nitrobenzene 1 1 - 200
p-nitrochlorobenzene 0.1 1 mg/m3 - 100 mg/m3
++
Nitroethane 100 100 - 1000
Nitrogen dioxide 3 5+ 5 ACGIH
1 NIOSH
20
Nitrogen trifluoride 10 10 - 1000
Nitroglycerin 0.05 0.2+ 0.1 mg/m3 NIOSH 75 mg/m3
Nitromethane 20 100 - 750
1-nitropropane 25 25 - 1000
2-nitropropane 10 25 - 100 ++
Nitrotoluene (all isomers) 2 5 - 200
Octachloronaphthalene 0.1 mg/m3 0.1 mg/m3 0.3 mg/m3+ Unknown
Octane 300 500 385 / 15 min. NIOSH 1000
Oil mist, mineral 5 mg/m3 5 mg/m3 10 mg/m3 ACGIH/ NIOSH 2500 mg/m3
Osmium tetroxide (as Os) 0.0002 0.002 mg/m3 0.0006 ACGIH / NIOSH 1 mg/m3
Oxalic acid 1 mg/m3 1 mg/m3 2 mg/m3 500 mg/m3
Oxygen difluoride 0.05+ 0.05 0.05 ACGIH / NIOSH 0.5
Ozone 0.1 light work 0.1 0.1 NIOSH 5

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Paraquat (rd) 0.5 mg/m3 0.5 mg/m3 - 1 mg/m3
Parathion 0.05 mg/m3 0.1 mg/m3 - 10 mg/m3
Pentaborane 0.005 0.005 0.015 ACGIH / NIOSH 1
Pentachloronaphthalene 0.5 mg/m3 0.5 mg/m3 - Unknown
Pentachlorophenol 0.5 mg/m3 0.5 mg/m3 - 2.5 mg/m3
Pentaerythritol (td) 10 mg/m3 15 mg/m3 - -
Pentaerythritol (rf) - 5 mg/m3 - -
Pentane 600 1000 610 / 15 min. NIOSH 1500 (LEL)
2-pentanone (methyl propyl ketone) 150+ 200 250 1500
Perchloroethylene (tetrachloroethylene) 10 2 mg/m3 25 ACGIH 150 ++
Perchloromethyl mercaptan 0.1 0.1 - 10
Perchloryl fluoride 3 3 6 ACGIH / NIOSH 100
Perlite (td) - 15 mg/m3 - -
Perlite (rf) - 5 mg/m3 - -
Petroleum distillates (naphtha) (rubber solvent) See Specific 500 1800 mg/m3 NIOSH 1100 (LEL)
Phenol 5 5 15.6 /15 min. NIOSH 250
p-phenylene diamine 0.1 mg/m3 0.1 mg/m3 - 25 mg/m3
Phenyl ether, vapor 1 1 2 ACGIH 100
Phenyl ether-biphenyl mixture, vapor - 1 - 10
Phenyl glycidyl ether (PGE) 0.1 10 1 /15 min. NIOSH 100++
Phenylhydrazine 0.1 5 0.14 /120 min. NIOSH 15++
Phosdrin (mevinphos) 0.01 mg/m3 0.1 mg/m3 0.03 NIOSH 4
Phosgene (carbonyl chloride) 0.1 0.1 0.2 / 15 min. NIOSH 2
Phosphine 0.3 0.3 1 ACGIH / NIOSH 50
Phosphoric acid 1 mg/m3 1 mg/m3 3 mg/m3 ACGIH / NIOSH 1000 mg/m3
Phosphorus (yellow) 0.02 0.1 mg/m3 - 5 mg/m3
Phosphorus pentachloride 0.1 1 mg/m3 - 70 mg/m3
Phosphorus pentasulfide 1 mg/m3 1 mg/m3 3 mg/m3 250 mg/m3
Phosphorus trichloride 0.2 0.5 0.5 25
Phthalic anhydride 1 2 - 60 mg/m3
Picloram (td) 10 mg/m3 15 mg/m3 - -
Picloram (rf) - 5 mg/m3 - -
Picric acid 0.1 mg/m3 0.1 mg/m3 - 75 mg/m3
Pindone (2-pivalyl-1, 3-indandione) 0.1 mg/m3 0.1 mg/m3 - 100 mg/m3
Plaster of paris (td) - 15 mg/m3 - -
Plaster of paris (rf) - 5 mg/m3 - -
Platinum (as Pt) soluble salts 0.002 mg/m3 0.002 mg/m3 - 4 mg/m3
Portland cement (td) 10 mg/m3 15 mg/m3 - 5000 mg/m3
Portland cement (rf) - 5 mg/m3 - -
Propane (aliphatic hydrocarbon gases) 1000 1000 - 2100 (LEL)
n-propyl acetate 200 200 250 ACGIH / NIOSH 1700
n-propyl alcohol (n-propanol) 100 200 250 NIOSH 800
Propylene dichloride 10 75 - 400++
Propylene imine 2 2 - 100++
Propylene oxide 2 100 - 400++
n-propyl nitrate 25 25 40 ACGIH / NIOSH 500
Pyrethrum 5 mg/m3 5 mg/m3 - 5000 mg/m3
Pyridine 1 5 - 1000

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Quinone 0.1 0.1 - 100 mg/m3
Rhodium, metal fume and insoluble compounds 1 mg/m3 0.1 mg/m3 - 100 mg/m3
Rhodium, soluble compounds 0.01 mg/m3 0.001 mg/m3 - 2 mg/m3
Ronnel 5 mg/m3 15 mg/m3 - 300 mg/m3
Rotenone 5 mg/m3 5 mg/m3 - 2500 mg/m3
Rouge (td) - 15 mg/m3 - -
Rouge (rf) - 5 mg/m3 - -

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Selenium compounds (as Se) 0.2 mg/m3 0.2 mg/m3 - 1 mg/m3
Selenium hexafluoride (as Se) 0.05 0.05 - 2
Soapstone (td) 6 mg/m3 20 mppcf - 3000 mg/m3
Soapstone (rf) 3 mg/m3 20 mppcf - 3000 mg/m3
Silicon (td) - 15 mg/m3 - -
Silicon (rf) 3 mg/m3 5 mg/m3 - -
Silicon carbide (td) 10 mg/m3 15 mg/m3 - -
Silicon carbide (rf) - 5 mg/m3 - -
Silver, metal and soluble compounds (as Ag) 0.1 mg/m3 0.01 mg/m3 - 10 mg/m3
Sodium fluoro- acetate 0.05 mg/m3 0.05 mg/m3 - 2.5 mg/m3
Sodium hydroxide 2 mg/m3+ 2 mg/m3 2 mg/m3 NIOSH 10 mg/m3
Starch (td) 10 mg/m3 15 mg/m3 - -
Starch (rf) - 5 mg/m3 - -
Stibine (antimony hydride) 0.1 0.1 - 5
Stoddard solvent 100 500 1800 mg/m3 /15min
NIOSH
20,000 mg/m3
Strychnine 0.15 mg/m3 0.15 mg/m3 - 3 mg/m3
Styrene 20 100 40 ACGIH
100 NIOSH
700
Sucrose (td) 10 mg/m3 15 mg/m3 - -
Sucrose (rf) - 5 mg/m3 - -
Sulfur dioxide 2 5 5 ACGIH / NIOSH 100
Sulfur hexafluoride 1000 1000 - -
Sulfuric acid 0.2 mg/m3 1 mg/m3 - 15 mg/m3
Sulfur monochloride 1+ 1 1 NIOSH 5
Sulfur pentafluoride 0.01+ 0.025 0.01 NIOSH 1
Sulfuryl fluoride 5 5 10 ACGIH / NIOSH 200

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
2,4,5-T (2,4,5-trichloro- phenoxyacetic acid) 10 mg/m3 10 mg/m3 - 250 mg/m3
Talc (containing asbestos) See 29 CFR 1910.1001 - - - 1000 mg/m3 ++
Talc (containing no asbestos) 2 mg/m3 20 mppcf - 1000 mg/m3
Tantalum, metal and oxide dust 5 mg/m3 5 mg/m3 - 2500 mg/m3
TEDP (sulfotep) 0.1 mg/m3 0.2 mg/m3 - 10 mg/m3
Tellurium and compounds (as Te) 0.1 mg/m3 0.1 mg/m3 - 25 mg/m3
Tellurium hexafluoride (as Te) 0.02 0.02 - 1
Temephos (td) 1 mg/m3 15 mg/m3 - -
Temephos (rf) - 5 mg/m3 - -
TEPP (tetraethyl pyrophosphate) 0.01 mg/m3 0.05 mg/m3 - 5 mg/m3
Terphenyls 0.53 + 1 + 0.5 NIOSH 500 mg/m3
1,1,1,2-tetrachloro-2, 2-difluoroethane 100 500 - 2000
1,1,2,2-tetrachloro-1, 2-difluoroethane 50 500 - 2000
1,1,2,2-tetrachloroethane 1 5 - 100++
Tetrachloronaphthalene 2 mg/m3 2 mg/m3 - Unknown
Tetraethyl lead (as Pb) 0.1 mg/m3 0.075 mg/m3 - 40 mg/m3
Tetrahydrofuran 50 200 100 ACGIH
250 NIOSH
2000 (LEL)
Tetramethyl lead (as Pb) 0.15 mg/m3 0.075 mg/m3 - 40 mg/m3
Tetramethyl succinonitrile 0.5 0.5 - 5
Tetranitromethane 0.005 1 - 4
Tetryl (2,4,6-trinitro-phenylmethylnitramine) 1.5 mg/m3 1.5 mg/m3 - 750 mg/m3
Thallium, soluble compounds (as Tl) 0.1 mg/m3 0.1 mg/m3 - 15 mg/m3
4,4'-Thiobis (6-tert, butyl-m-cresol) (td) 10 mg/m3 15 mg/m3 - -
4,4'-Thiobis (6-tert, butyl-m-cresol) (rf) - 5 mg/m3 - -
Thiram 0.05 mg/m3 5 mg/m3 - 100 mg/m3
Tin, inorganic compounds (except oxides) (as Sn) 2 mg/m3 2 mg/m3 - 100 mg/m3
Tin, organic compounds (as Sn) 0.1 mg/m3 0.1 mg/m3 - 25 mg/m3
Titanium dioxide (td) 10 mg/m3 15 mg/m3 - 5000 mg/m3 ++
Toluene 20 200 300 OSHA
500 /10 min. peak
150 NIOSH
500
Toluene-2,4-diisocyanate (TDI) 0.005 0.02+ - 2.5++
o-toluidine 2 5 - 50++
Tributyl phosphate 0.2 5 mg/m3 - 30
1,1,2-trichloroethane 10 10 - 100++
Trichloroethylene 10 100 25 ACGIH 1000 ++
Trichloronaphthalene 5 mg/m3 5 mg/m3 - Unknown
1,2,3-trichloropropane 10 50 - 100++
1,1,2-trichloro-1,2,2- trifluoroethane 1000 1000 1250 ACGIH / NIOSH 2000
Triethylamine 1 25 3 ACGIH 200
Trifluorobromo- methane 1000 1000 - 40,000
2,4,6-trinitrotoluene (TNT) 0.1 mg/m3 1.5 mg/m3 - 500 mg/m3
Triorthocresyl phosphate 0.1 mg/m3 0.1 mg/m3 - 40 mg/m3
Triphenyl phosphate 3 mg/m3 3 mg/m3 - 1000 mg/m3
Turpentine - 100 - 800

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Uranium (as U) soluble compounds 0.2 mg/m3 0.05 mg/m3 - 10 mg/m3++
Uranium (as U) insoluble compounds 0.2 mg/m3 0.25 mg/m3 - 10 mg/m3++
Vegetable oil mist (td) - 15 mg/m3 - -
Vegetable oil mist (rf) - 5 mg/m3 - -
Vinyl toluene 50 100 100 ACGIH 400
Warfarin 0.1 mg/m3 0.1 mg/m3 - 100 mg/m3

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

 

Chemical Name TLV
ppm
PEL
ppm
STEL/Ceiling
ppm
IDLH
ppm
Xylenes (o-, m-, p-isomers) 100 100 150 ACGIH / NIOSH 900
Xylidine 0.5 5 - 50
Yttrium 1 mg/m3 1 mg/m3 - 500 mg/m3
Zinc chloride fume 1 mg/m3 1 mg/m3 2 mg/m3 ACGIH / NIOSH 50 mg/m3
Zinc oxide fume - 5 mg/m3 - 500 mg/m3
Zinc oxide (td) 2 mg/m3 15 mg/m3 - 500 mg/m3
Zinc oxide (rf) - 5 mg/m3 - 500 mg/m3
Zinc stearate (td) 10 mg/m3 15 mg/m3 - -
Zinc stearate (rf) - 5 mg/m3 - -
Zirconium compounds (as Zr) 5 mg/m3 5 mg/m3 10 mg/m3 25 mg/m3

 

" + " indicates a ceiling value

" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.

Sources

Information on the most up to date NIOSH chemical hazards can be found online in the NIOSH Pocket Guide to Chemical Hazards, NIOSH, 2010

ACGIH

OSHA 29 CFR 1910.1000, Table Z-1

(Rev. 9/2013)

 

Find even more information you can use to help make informed decisions about the regulatory issues you face in your workplace every day. View all Quick Tips Technical Resources at www.grainger.com/quicktips.

Think Safety. Think Grainger.®
Grainger has the products, services and resources to help keep employees safe and healthy while operating safer facilities. You’ll also find a network of safety resources that help you stay in compliance and protect employees from hazardous situations. Count on Grainger for lockout tagout, fall protection equipment, confined space products, safety signs, personal protective equipment (PPE), emergency response and so much more!

Please Note:
The content in this newsletter is intended for general information purposes only. This publication is not a substitute for review of the applicable government regulations and standards, and should not be construed as legal advice or opinion. Readers with specific compliance questions should refer to the cited regulation or consult with an attorney.

©2012 W.W. Grainger, Inc.

loader image