Sch. II

PERMISSIBLE LEVELS OF CERTAIN CHEMICAL SUBSTANCES IN WORK ENVIRONMENT.

THE SECOND SCHEDULE

[See section 41F]

PERMISSIBLE LEVELS OF CERTAIN CHEMICAL SUBSTANCES IN WORK ENVIRONMENT

Sl. No.
Substance
Permissible limits of exposure
r
e

Time-Weighted average concentration (TWA)
(TWA)
Short-term exposure limit (15 min.)
(STEL)
a
a
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
-
0.1
-
-
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
a
a
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
a
a
a
a
a
(i) Alkyle compounds
-
0.01
-
0.03
a
(ii) All forms except alkyle vapour
-
0.05
-
-
a
(iii) Aryle 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
a
a
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
d
a
a
a
f
(i) Fume
-
5.0
-
10
d
(ii) Dust (Total dust)
-
10.00
-
-
116
Zirconium compounds (as Zr)
-
5
-
10