Sl. No. | Substance | Permissible limits of exposure |
| | Time-Weighted average concentration (TWA) | (TWA) | Short-term exposure limit (15 min.) | (STEL) |
| | PPm | mg/m3 | PPm | mg/m3 |
1 | 2 | 3 | 4 | 5 | 6 |
1 | Acetaldehyde | 100 | 180 | 150 | 270 |
2 | Acetic Acid | 10 | 25 | 15 | 37 |
3 | Acetone | 750 | 1780 | 1000 | 2375 |
4 | Acrolein | 01 | 0.25 | 0.3 | 0.8 |
5 | Acrylonitrile-skin (S.C) | 2 | 4.5 | - | - |
6 | Aldrin-skin | - | 0.25 | - | - |
7 | Allyl Chloride | 1 | 3 | 2 | 6 |
8 | Ammonia | 0.25 | 18 | 35 | 27 |
9 | Aniline-skin | 2 | 10 | - | - |
10 | Anisidine (O.P.isomers)-skin | 0.1 | 0.5 | - | - |
11 | Arsenic & Soluble compounds (as As) | - | 0.2 | - | - |
12 | Benzene (S.C) | 10 | 30 | - | - |
13 | Beryllium & Compounds (as Be) (S.C) | - | 0.002 | - | - |
14 | Boron trifluoride C | 1 | 3 | - | - |
15 | Bromine | 0.1 | 0.7 | 0.3 | 2 |
16 | Butane | 800 | 1900 | - | - |
17 | 2-Butanone (Methyle ethyle Ketone MEK) | 200 | 590 | 300 | 885 |
18 | N-Butyl acetate | 150 | 710 | 200 | 950 |
19 | N-Butyl alcohol-skin-C | 50 | 150 | - | - |
20 | Sce/tert, Butyl acetate | 200 | 950 | - | - |
21 | Butyl Mercaptan | 0.5 | 1.5 | - | - |
22 | Cadmium-dust and salts (as Cd) | - | 0.05 | - | - |
23 | Calcium oxide | - | 2 | - | - |
24 | Carbaryl (Sevin) | - | 5 | - | - |
25 | Carbofuran (Furadan) | - | 0.1 | - | - |
26 | Carbon disulphide-skin | 10 | 30 | - | - |
27 | Carbon monoxide | 50 | 55 | 400 | 440 |
28 | Carbon tetrachloride-skin (S.C.) | 5 | 30 | - | - |
29 | Chlordane-skin | - | 0.5 | - | 2 |
30 | Chlorine | 1 | 3 | 3 | 9 |
31 | Chlorobenzene (monochlorobenzene) | 75 | 350 | - | - |
32 | Chloroform (S.C.) | 10 | 50 | - | - |
33 | bis-(Chloromethyl) ether (H.C.) | 0.001 | 0.005 | - | - |
34 | Chromic acid and chromates (as Cr) (Water soluble) | - | 0.05 | - | - |
35 | Chromous Salts (as Cr) | - | 0.5 | - | - |
36 | Copper fume | - | 0.2 | - | - |
37 | Cotton dust, raw | - | 0.2 | - | - |
38 | Cresoal, all isomers-skin | 5 | 22 | - | - |
39 | Cyanides (as Cn)-skin | - | 5 | - | - |
40 | Cyanogen | 10 | 20 | - | - |
41 | DDT (Dichlorodiphenyl Trichloroethane) | - | 1 | - | - |
42 | Demeton-skin | 0.01 | 0.1 | - | - |
43 | Diazinon-skin | - | 0.1 | - | - |
44 | Dibutyl Phythalate | - | 5 | - | - |
45 | Dichlorous (DDVP)-skin | - | 1 | - | - |
46 | Dieldrin-skin | - | 0.25 | - | - |
47 | Dinitrobenzene (all isomers)-skin | 0.15 | 1 | - | - |
48 | Dinitrotoluene-skin | - | 1.5 | - | - |
49 | Diphenyl (Biphenyl) | 0.2 | 1.5 | - | - |
50 | Endosulfan (Thiodan)- skin | - | 0.1 | - | - |
51 | Endrin-skin | - | o.1 | - | - |
52 | Ethyl acetate | 400 | 1400 | - | - |
53 | Ethyl alcohol | 1000 | 1900 | - | - |
54 | Ethylamin | 10 | 18 | - | - |
55 | Fluorides (as F) | - | 2.5 | - | - |
56 | Fluorine | 1 | 2 | 2 | 4 |
57 | Formaldehyde (S.C.) | 1.0 | 1.5 | 2 | 3 |
58 | Formic Acid | 5 | 9 | - | - |
59 | Gasoline | 300 | 900 | 500 | 1500 |
60 | Hydrazine-skin (S.C.) | 0.1 | 0.1 | - | - |
61 | Hydrogen Chloride-C | 5 | 7 | | |
62 | Hydrogen Cyanide skin-C | 10 | 10 | - | - |
63 | Hydrogen Fluoride (as F)-C | 3 | 2.5 | - | - |
64 | Hydrogen Peroxide | 1 | 1.5 | - | - |
65 | Hydrogen Sulphide | 10 | 14 | 15 | 21 |
66 | Iodine-C | 0.1 | 1 | - | - |
67 | Iron Oxide Fume (F0203) (as Fe) | - | 5 | - | - |
68 | Isoamyl acetate | 100 | 525 | - | - |
69 | Isoamyl alcohol | 100 | 360 | 125 | 450 |
70 | Isobutyl alcohol | 50 | 150 | - | - |
71 | Lead, inorg, dusts, dusts and fumes (as Pb) | - | 0.15 | - | - |
72 | Lindane-skin | - | 0.5 | - | - |
73 | Malathion-skin | - | 10 | - | - |
74 | Manganese dust and compounds (as (Mn)-C | - | 5 | - | - |
75 | Manganese Fume (as Mn) | - | 1 | - | 3 |
76 | Mercury (as Hg)-skin | | | | |
| (i) Alkyle compounds | - | 0.01 | - | 0.03 |
| (ii) All forms except alkyle vapour | - | 0.05 | - | - |
| (iii) Aryle and inorganic compounds | - | 0.01 | - | - |
77 | Methyl alcohol (Methanol)-skin | 200 | 260 | 250 | 310 |
78 | Methyl cellosolve (2-methoxyethanol)-skin | 5 | 16 | - | - |
79 | Methyl isobutyl Ketone | 50 | 205 | 75 | 300 |
80 | Methyl Isocyanate-skin | 0.02 | 0.05 | - | - |
81 | Naphthalene | 10 | 50 | 15 | 75 |
82 | Nickel carbonyl (as Ni) | 0.05 | 0.35 | - | - |
83 | Nitric acid | 2 | 5 | 4 | 10 |
84 | Nitric Oxide | 25 | 30 | - | - |
85 | Nitrobenzene-skin | 1 | 5 | - | - |
86 | Nitrogen dioxide | 3 | 6 | 5 | 10 |
87 | Oil mist mineral | - | 5 | - | 10 |
88 | Ozone | 0.1 | 0.2 | 0.3 | 0.6 |
89 | Parathion-skin | - | 0.1 | - | - |
90 | Phenol-skin | 5 | 19 | | |
91 | Phorate (Thimet)-skin | - | 0.05 | 0.2 | - |
92 | Phosgene (Carbonyl Chloride) | 0.1 | 0.4 | - | - |
93 | Phosphine | 0.3 | 0.4 | 1 | 1 |
94 | Phosphoric acid | - | 1 | - | 3 |
95 | Phosphorus (yellow) | - | 0.1 | - | - |
96 | Phosphorus penta- chloride | 0.1 | 1 | - | - |
97 | Phosphorus trichloride | 0.2 | 1.5 | 0.5 | 3 |
98 | Picric acid-skin | - | 0.1 | - | 0.3 |
99 | Pyridine | 5 | 15 | - | - |
100 | Silans (silicon tetrahydride) | 5 | 7 | - | - |
101 | Sodium hydroxide-C | - | 2 | - | - |
102 | Styrene, monomer (phanylethlene) | 50 | 215 | 100 | 425 |
103 | Sulphur dioxide | 2 | 5 | 5 | 10 |
104 | Sulphur hexafluoride | 1000 | 6000 | - | - |
105 | Sulphuric acid | - | 1 | - | - |
106 | Tetraethyl lead (as Pb) - Skin | - | 0.1 | - | - |
107 | Toluene (Toluol) | 100 | 375 | 150 | 560 |
108 | O-Toluidine-skin (S.C.) | 2 | 9 | - | - |
109 | Tributylphosohate | 0.2 | 2.5 | - | - |
110 | Trichloroethylene | 50 | 270 | 200 | 1080 |
111 | Uranium natural (as U) | - | 0.2 | - | 0.6 |
112 | Vinyl Chloride (H.C.) | 5 | 10 | - | - |
113 | Welding fumes | - | 5 | - | - |
114 | Xylene (O-m-P-isomers) | 100 | 435 | 150 | 655 |
115 | Zinc oxide | | | | |
| (i) Fume | - | 5.0 | - | 10 |
| (ii) Dust (Total dust) | - | 10.00 | - | - |
116 | Zirconium compounds (as Zr) | - | 5 | - | 10 |