(See Section 41-F)
|
Sl. No. |
Substances |
Permissible Limits of Exposure |
|||
|
Time-Weighted Average-
Concentration (TWA) (8 hrs.) |
Short-term exposure Limit
STEL (15 min) |
||||
|
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 |
1,780 |
1,000 |
2,375 |
|
4 |
Acrolein |
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 |
-- |
-- |
|
2[12 |
Benzene
(H.C.) |
0.5 |
1.5 |
2.5 |
7.5] |
|
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 |
1,900 |
-- |
-- |
|
17 |
2-Butanone
(Metyl ethyl Ketone-MEK) |
200 |
590 |
300 |
885 |
|
18 |
n-Butyl
acetate |
150 |
710 |
200 |
950 |
|
19 |
n-Butyl
alcohol-Skin-C |
50 |
150 |
-- |
-- |
|
20 |
Sec/Tert.
Butyl acetate |
200 |
950 |
-- |
-- |
|
21 |
Butyl
mercaptan |
0.5 |
1.5 |
-- |
-- |
|
22 |
Cadmium
Dusts 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 |
1. Ins. by
Act 20 of 1987, S.45 (w.e.f. 1.12.1987)
2.
Subs. by S.O.342(E) dt.19.4.2001(w.e.f.) 19.4.2001, Gaz. of India Ext.247, dt.
19.4.2001. Pt.II, Sec.3(ii).
|
1 |
2 |
3 |
4 |
5 |
6 |
|
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 |
Chrombus
salts (as Cr) |
-- |
0.5 |
-- |
-- |
|
36 |
Copper
Fume |
-- |
0.2 |
-- |
-- |
|
37 |
Cotton
Dust, raw |
-- |
0.2 *1 |
-- |
-- |
|
38 |
Cresol,
all isomers-Skin |
5 |
22 |
-- |
-- |
|
39 |
Cyanide
(as CN)-Skin |
-- |
5 |
-- |
-- |
|
40 |
Cyanogen
|
10 |
20 |
-- |
-- |
|
41 |
DDT (Dichlorodiphenyl trichlorothane) |
-- |
1 |
-- |
-- |
|
42 |
Demeton-Skin |
0.01 |
0.1 |
-- |
-- |
|
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 |
Ethylacetate |
400 |
1,400 |
-- |
-- |
|
53 |
Enthyl
alcohol |
1,000 |
1,900 |
-- |
-- |
|
54 |
Ethylamine |
10 |
18 |
-- |
-- |
|
55 |
Fluoride
(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 |
1,500 |
|
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 (Fe2 O3 (as Fe) |
-- |
5 |
-- |
-- |
|
68 |
Isoamyl
acetate |
100 |
525 |
-- |
-- |
1 *Lint-free dust as measured by the vertical elutricator cotton dust sampler.
|
1 |
2 |
3 |
4 |
5 |
6 |
|
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 |
-- |
0.03 |
|
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
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 (yellow) |
-- |
1 |
-- |
3 |
|
95 |
Phosphorus
(yellow) |
-- |
0.1 |
-- |
-- |
|
96 |
Phosphorus
pentachloride |
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 |
Silane
(Silicon tetrahydride |
5 |
7 |
-- |
-- |
|
101 |
Sodium
hydroxide C |
-- |
2 |
-- |
-- |
|
102 |
Styrene,
monomer (Phenylethylene) |
50 |
215 |
100 |
425 |
|
103 |
Sulphur
dioxide |
2 |
5 |
5 |
10 |
|
104 |
Sulphur
hexafluoride |
1,000 |
6,000 |
-- |
-- |
|
105 |
Sulphuric
Acid |
-- |
1 |
-- |
-- |
|
106 |
Tetraethyl
lead (as Pb)-Skin |
-- |
0.1 |
-- |
-- |
|
107 |
Toluene
(Toluol) |
100 |
375 |
150 |
560 |
|
108 |
O-Tuluidine-Skin
(S.C) |
2 |
9 |
-- |
-- |
|
109 |
Tributyl
Phosphate |
0.2 |
2.5 |
-- |
-- |
|
110 |
Trichloroethylene |
50 |
270 |
200 |
1,080 |
|
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 |
|
ppm : |
Parts of vapour or gas per million parts of contaminated air by volume at 25OC and 760 toor (mm of mercury) |
|
mg/m3 |
milligram of substances per cubic metre of air. |
|
*: ,. |
Not more than 4 times a day with at least 60 min. internal between successive exposures |
|
**: |
Molecular weight mg/m3 ----------------------------------x ppm 24.45 |
|
C : |
denotes ceiling limit. |
|
Skin : |
denotes potential contribution to the overall exposure by the cutaneous route including mucous membranes and eye. |
|
S.C. : |
denotes suspected human carcinogens. |
|
H.C. : |
denotes confirmed human carcinogens. |
----------------------------------------------------------------------------------------------------------
Substance Permissible time-weighted average concentration
(TWA) (8 hours)
----------------------------------------------------------------------------------------------------------
Silica, Si O2
(a) Crystalline
(i) Quartz
10600
(1) In terms of dust count ------------------------------------- mppcm
% Quartz + 10
10
(2) In terms of respirable dust --------------------------------- mg/m3
% respirable Quartz + 2
30
(3) In terms of total dust -------------------------------------- mg/m3
% Quartz + 3
(ii) Cristobalite : Half the limits given against quartz
(iii) Tridymite : 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 : 10 mg/m3, Total Dust
[Asbestos (H.C.
(a) Amosite ………………………………0.5 fibre/cc***
(b) Chrystolite …………………………….1.0 fibre/cc***
(c) Crocidolite ……………………………..0.2 fibre/cc***]
Portland cement : 10 mg/m3, Total dust containing less than 1% quartz.
Coal Dust : 2mg/m3, 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.
*** (i) For fibres greater than 5 um in length and less than 5 um in breadth with length to breadth ratio equal to or greater than 3:1.
(ii) As determined by the membrane filter method at 400-450 x magnification (4mm objective) phase contrast illumination.
-------------------------------------------------------------------------------------------------------
Respirable Dust :
Fraction passing a size-selector with the following characteristics :
|
Aerodynamic
Diameter (UM) (Unit density sphere) |
%
passing selector |
|
2 |
90 |
|
2.5 |
75 |
|
3.5 |
50 |
|
5.0 |
25 |
|
10 |
0 |
2.
Subs. by S.O.342(E) dt.19.4.2001(w.e.f.) 19.4.2001, Gaz. of India Ext.247, dt.
19.4.2001. Pt.II, Sec.3(ii).
Date : 4th June, 2007