| 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 |
