Schedule- XII (See rule 152(a) PERMISSIBLE LEVELS OF CERTAIN CHEMICAL SUBSTANCES IN THE WORK ENVIRONMENT S. No. | Substance | Permissible limits of exposure | Time-weighted average concern - raction (TWA) (8 hrs.) | Short-term exposure limit (STEL)(15 min.)* | | | ppm | mg/m** | ppm | mg/m** | 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. | Aerolein | 0.1 | 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 | 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 & Compound (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 (Methyl ethyl etone-MBK) | 200 | 590 | 300 | 885 | 18. | n-Butyl acetate | 150 | 710 | 200 | 950 | 19. | n-Butyl alcohol-Skin-C | 50 | 150 | -- | -- | 20. | Sec/tart. 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 | -- | -- | 30. | Chlorine | 1 | 3 | 3 | 9 | 31. | Chlorobenzene (monochlorobenzene) | 75 | 350 | -- | -- | 32. | Chloroform (S.C) | 10 | 50 | -- | -- | 33. | bis (Chloromethy) ether (H.C) | 0.001 | 0.005 | -- | -- | 34. | Chromie acid and chromates (as Cr.) (water soluble) | -- | 0.05 | -- | -- | 35. | Chromous saits (as Cr.) | -- | 0.5 | -- | -- | 36. | Copper fume | -- | 0.2 | -- | -- | 37. | Cotton dust, raw | -- | 0.2* | -- | -- |
Line free dust as measured by the vertical elutriator cotton-dust sampler. S. No. | Substance | Permissible limits of exposure | Time-weighted average concern - raction (TWA) (8 hrs.) | Short-term exposure limit (STEL)(15 min.)* | | | ppm | mg/m** | ppm | mg/m** | 1 | 2 | 3 | 4 | 5 | 6 | 38. | Cresol, all isomers-Skin | 5 | 22 | -- | -- | 39. | Cyanides (as CN)-Skin | -- | 1 | -- | -- | 40. | Cyanogens | 10 | 20 | -- | -- | 41. | DDT (Dishlorodiphenyl richloroethane) | -- | 1. | -- | -- | 42. | Demeton-Skin | 0.01 | 0.1 | -- | -- | 43. | 43. Diazinon-Skin | -- | 0.1 | -- | -- | 44. | Dibutyl phthalate | -- | 5 | -- | -- | 45. | Dichlorvos (DDVP)-Skin | 0.1 | 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 | -- | 0.1 | -- | -- | 52. | Ethyl acetate | 400 | 1400 | -- | -- | 53. | Ethyl alcohol | 1000 | 1900 | -- | -- | 54. | Ethylamine | 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 fluorine (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 (Fe O) (as Fe) | -- | 5 | -- | -- | 68. | Isoamyl acetate | 100 | 525 | -- | -- | 69. | Isoamyl alcohol | 100 | 360 | 125 | 450 | 70. | Isobutyl alcohol | 50 | 150 | -- | -- | 71. | Lead, inorg.. 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 | -- | -- | 76. | Mercury (as Hg)-Skin | | | | | | (i) Alkyl compounds | -- | 0.01 | -- | 0.03 | | (ii) All forms except alkyl vapour | -- | 0.05 | -- | -- | | (iii) Aryl and inorganic compounds | -- | 0.1 | -- | -- | 77. | Methyl alcohol (Methanol)-Skin | 200 | 260 | 250 | 310 | 78. | Methyl collosolve (2-Methoxy- thanol)-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 | -- | 0.02 | 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 pentachloride | 0.1 | 1 | -- | -- | 97. | Phosphorus trichloride | 0.2 | 1.5 | 0.5 | 5.3 | 98. | Pierie acid-Skin | -- | 0.1 | -- | 0.3 | 99. | Pyridine | 5 | 15 | -- | -- | 100. | Silane (Silicon tetrahudride) | 5 | 7 | -- | -- | 101. | Sodium hydroxide-C -- 2 -- -- | -- | 2 | -- | -- | 102. | Styrene, monomer (Phenylethylene) | 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. | Tolune (Toluol) | 100 | 375 | 150 | 560 | 108. | O-Toluidine-Skin(S.C.) | 2 | 9 | -- | -- | 109. | Tributvi phosphate | 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 (0-, m-, p-isomers) | 100 | 435 | 150 | 655 | 115. | Zinc oxide | | | | | | (i) Fume | -- | 5.0 | -- | 10 | | (ii) Dust (Total dust) | -- | 10.0 | -- | -- | 116. | Zirconium compounds (as Zr) | -- | 5 | -- | 10 |
ppm | Parts of vapour or gas per million parts of contaminated air by volume at 25 C and 760 mm of Hg. | mg/m | milligram of substance per cubic metre of air | * | Not more than 4 times a day with at least 60 min. interval between successive exposures. | ** | | Molecular weight | | mg/m = | ------------------------- | x ppm | | 24.45 | |
| G | denotes Ceiling Limit | Skin. | denotes potential contribution to the overall exposure by the coetaneous route including mucous membranes and eye. | S.C. | denotes Suspected Hyman Carcinogen. | H.C. | denotes Confirmed Human Carcinogen. |
Substance | Permissible time-weighted average concentration (TWA) (8 hrs.) | Silica, SiO | | (a) | Crystalline | | | (i) | Quartz | | | | (1) | In terms of dust count | 10600 | | ------------------------- | mppem | % Quartz + 10 | |
| | | (2) | In terms of respirable dust | 10 | | ------------------------- | mg/m 3 | % respirable Quartz + 2 | |
| | | (3) | In terms of total dust | 30 | | ------------------------- | mg/m 3 | % Quartz + 3 | |
| | (ii) | Cristobalite | Half the limits given against quartz. | | (iii) | Tridvmite | Half the limits given against quartz. | | (iv) | Silica, fused | Same limits as for quartz. | | (v) | Tripoli | Same limit as in formula in item (2) given against quartz. | (b) | Amorphous Silicates | 10mg/m 3, Total dust. | | Asbestos (h.C.) | *2 fibres/ml, greater than 5 m in length and less than 3 m in breadth with length to breadth ratio equal to or greater than 3 : 1 | | Portland Cement | 10mg/m 3, Total dust containing less than 1% quartz. | | Coal Dust | 2mg/m, respirable dust fraction containing less than 5% quartz |
mppcm | Million particles per cubic metre of air, based on impinger samples counted by light-field techniques. | | As determined by the membrane filter method at 400 - 450x magnification (4 mm objective) phase contrast illumination. | | Respirable Dust : |
Fraction passing a size-selector with the following characteristics: Aerodynamic Diameter (m) (Unit density sphere) | % passing selector | < 2 | 90 | 2.5 | 75 | 3.5 | 50 | 5.0 | 25 | 10 | 0 |
BY ORDER AND IN THE NAME OF THE LT. GOVERNOR OF THE NATIONAL CAPITAL TERRITORY OF DELHI (K.R.SAWHNEY) UNDER SECRETARY (LABOUR) GOVERNMENT OF N.C.T. OF DELHI No.DLC/CLA/BCW/01/ Dated the, 2002 Copy to:- 1. The Dy. Secretary, General Administration Department (in duplicate) for favour of publication in the Delhi Gazette Extra-ordinary of today's date. It is requested to kindly send 10 copies of the Gazette for official use. 2. The Secretary to the Lt. Governor, Government of Delhi, Raj Niwas, Delhi. 3. Secretary to the Government of India, Ministry of Labour, Sharam Shakti Bhawan, New Delhi. 2. Secretary to the Minister of Labour, Government of Delhi, Old Secretariat, Delhi. 3. P.S. to Chief Secretary, Government of National Capital Territory of Delhi of Delhi, Delhi. 4. Secretary (Law & Judicial), Government of Delhi, Delhi. 5. Labour Commissioner, Government of National Capital Territory of Delhi OF Delhi, 5, Shamnath marg, Delhi. 6. J.Labour Commissioner's/D.Labour Commissioner's/A.Labour Commissioner'S and Labour officer. 7. The Editor, Shram Patrika, Labour Department, Delhi. 8. Asstt. Director (P&S), Labour Department, 5, Shamnath marg, Delhi. 11. Librarian/Guard File, Labour Department, Delhi. (K.R.SAWHNEY) UNDER SECRETARY (LABOUR) GOVERNMENT OF N.C.T. OF DELHI |
