Serial No.

Substance

Permissible limits of exposure

Time-weighted average concentration (8 hrs)

Short-term exposure limit (15 min)*

ppm

mg/m^{3 **}

ppm

mg/m^{3 **}

1.       

Acetaldehyde

100

180

150

270

2.       

Acetic acid

10

25

15

37

3.       

Acetone

750

1780

1000

2375

4.       

Acrclein

0.1

0.25

0.3

0.8

5.       

Acrylonitrile-Skin

2

4.5

-

-

6.       

Aldrin-skin

-

0.25

-

-

7.       

Allychloride

1

3

2

6

8.       

Ammonia

25

18

35

27

9.       

Aniline-Skin

2

10

-

-

10.    

Anisidine (o-,pisomers) 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 Ketone-MEK)

200

590

300

835

18.    

n-Butylacetate 150

710

200

950

-

19.    

n-Butyle alcohol-Skin-C

50

150

-

-

20.    

Sec/tert. Butylacetate

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 disulphade-Skin

10

30

-

-

27.    

Carbon monoxide

50

55

400

440

28.    

Carbon to trachloride-Skin (S.C.)

5

30

-

-

29.    

Chlorodene-Skin

-

0.5

-

-

30.    

Chlorine

1

3

3

9

31.    

Chlorobenzene (Monochlorobenzene)

75

350

-

-

32.    

Chloroform (S.C.)

10

50

-

-

33.    

bis (Chloromethyl) ether (RC.)

0.001

0.005

-

-

34.    

Chromic acid and chromates (as Cr)

-

0.05

-

-

35.    

Chromous salts (as Cr)

-

0.05

-

-

36.    

Copper Fume

-

0.2

-

-

37.    

Cotton dust, raw*

-

0.2*

-

-

38.    

Crosol, all isomers-Skin

5

22

-

-

39.    

Cyanides (as CN)-Skin

-

5

-

-

40.    

Cyanogen

-

10

20

-

41.    

DDT (Dichlorodi-phenyl trichloroethane)

-

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.    

Dinitrotolune-Skin

-

1.5

-

-

49.    

Diphenyl-(Biphenyl)

0.2

1.5

-

50.    

Endosulfan (Thiodan)-Skin

-

0.1

-

-

51.    

Endrin-Skin

-

0.1

-

-

52.    

Ethylacetate

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 cynide-Skin-C

10

10

-

-

63.    

Hydrogen tluoride (as F)-C

3

2.5

-

-

64.    

Hydrogen peroxide

1

1.5

-

-

65.    

Hydrogen suylphide

10

14

15

21

66.    

Iodine-C

0.1

1

-

-

67.    

Iron-Oxide Fume (F°20) (as Fe)

-

5

-

-

68.    

Isoamyl acetate

100

525

-

-

69.    

Isoamyl alcohol

100

360

125

4500

70.    

Isobutyl alcohal

50

150

-

-

71.    

Lead, inorg, dusts and fumes (as Pb)

-

0.15

-

-

72.    

Lindane-Skin

-

0.5

-

-

73.    

Malathion-Skin

-

10

-

-

74.    

Manganese (as Mn) dust and compounds-C

-

5

-

-

75.    

Manganese fume (as Mn)

-

I

-

3

76.    

Mercury (as Hg)-Skin-

(i)       Alkyl compounds

(ii)     All forms except alkyl vapor

-

-

0.01

0.05

-

-

0.03

-

77.    

Aryl and inorganic compounds

-

0.1

-

-

78.    

Methyl alcohol (Methanol)-Skin

200

260

250

310

79.    

Methyl Cellosolve (2-Methoxyethanol) Skin

5

16

-

-

80.    

Methyl isobutyl ketone

50

205

75

300

81.    

Methyl isocyanate-Skin

0.02

0.05

-

-

82.    

Napthalene

10

50

15

75

83.    

Nickel carbonyl (as Ni)

0.05

0.35

-

-

84.    

Nitric acid

2

5

4

10

85.    

Nitric oxide

25

30

-

-

86.    

Nitrobenzene-Skin

1

5

-

-

87.    

Nitrogen dioxide

3

6

5

10

88.    

Oil mist-mineral

-

5

-

10

89.    

Ozone

0.1

0.2

0.3

0.6

90.    

Parathion-Skin

-

0.1

-

-

91.    

Phenol-Skin

5

19

-

-

92.    

Phorate {Thimet)-Skin

-

0.05

-

0.2

93.    

Phosgene (Carbonyl chloride)

0.1

0.4

-

-

94.    

Phosphine

0.3

0.4

1

1

95.    

Phosphoric acid

-

1

-

3

96.    

Phosphorus (yellow)

-

0.1

-

-

97.    

Phosphorus pentachloride

0.1

1

-

-

98.    

Phosphorus trichloride

0.2

I.5

0.5

3

99.    

Picric acid-Skin

-

0.1

-

0.3

100.   

Pyridine

5

15

-

-

101.   

Silans (Silicon tetrahydride)

5

7

-

-

102.   

Sodium hydroxide-C

-

2

-

-

103.   

Styrene, monomer (phenylethylene)

50

215

100

425

104.   

Sulphur dioxide

2

5

5

10

105.   

Sulphur hexafluoride

1000

6000

-

-

106.   

Sulphuric acid

-

1

-

-

107.   

Tetraethyl lead (as Pb)-Skin

-

0. 1

-

-

108.   

Toluene (Toluol)

100

375

150

560

109.   

o-Toluidinz-Skin (S.C.)

2

9

-

-

110.