Schedule to Schedule XXXV

1. Definitions

For the purpose of this schedule

(a) "mg/m3" means milligrams of a substance per cubic meter of air;

(b) "mppcm" means million particles of a substance per cubic meter of air;

(c) "ppm" means parts of vapour or gas per million parts of air by volume at

250 C and 760 mm of mercury pressure;

(d) "Time weighted average concentration" means the average concentration

of a substance in the air at any work location in a factory computed from

evaluation of adequate number of air samples taken at that location spread

over the entire shift on an day, after giving weightage to the duration for

which each such sample is collected and the concentration prevailing at the

time of taking the sample.

Time weighted average concentration = [(C1T1+ C2T2+…. +

CnTn)/1+T2+…Tn]

Where C1 represents the concentration of the substance for

duration T1 (in hours);

C2 represents the concentration of the substance for duration T2 (in hours)

; and

Cn represents the concentration of the substance for duration Tn (in

hours);

(e) "Work location" means a location in a factory at which a worker works or

may be required to work at any time during any shift on any day.

2. Limits of concentrations of substance at work locations

(1) The time weighted average concentration of any substance listed in Table1

or 2 of the schedule, at any work location in a factory during any shift

onany day shall not exceed the limit of the permissible time weighted

average concentration specified in respect of that substance:

Provided that in the case of a substance mentioned in Table 1 in

respect of which a limit in terms of short term maximum concentration is

indicated, the concentration of such a substance may exceed the

permissible limit of the time weighted average concentration for the

substance for short periods not exceeding 15 minutes at a time, subject to

the condition that

(a) Such periods during which the concentration exceeds the prescribed time

weighted average concentration are restricted to not more than 4 per shift;

(b) The time interval between any two such periods of higher exposure

>hail not be lesst han 60 minutes; and

(c) at no time the concentration of the substance in the air shall exceed the

limit of short term maximum concentration.

(2) In the case of any substance given in Table 3, the concentration of the

substance at any work location in a factory at any time during any day

shall not exceed the limit of exposure for that substance specified in the

Table.

(3) In the cases where the word "skin" has been indicated against certain

substance mentioned in Tables 1 and 3, appropriate measures shall be

taken to prevent absorption through cutaneous routes particularly skin,

mucous membranes and eyes as the limits pecified in these Tables are for

conditions where the exposure is only through respiratory tract.

(4) (a) In case, the air at any work location contains a mixture of such

substances mentioned in Tables 1, 2 or 3, which have similar toxic

properties, the time weighted concentration of each of these substances

during the shift should be such, that when these time weighted

concentration divided by the respective permissible time weighted average

concentration specified in the above mentioned tables, and the fractions

obtained are added together, the total shall not exceed unity, i.e. C1

/L1+C3 /L3+ Cn /Ln should not exceed unity when

When CI, C2,….,Cn are the time weighted concentration of toxic

substances 1, 2 and in respectively, determined after measurement at

work location;

and LI, L2 Ln are the permissible time weighted average concentration

of the toxic substances 1, 2 and in respectively.

(b) In case the air at any work location contains a mixture of substances

mentioned in Table 1, 2 or 3, and these do not have similar toxic

properties, then the time weighted concentration of each of these

substances shall not exceed the permissible time weighted average

concentration specified in the above-mentioned tables, for that particular

substance.

(c) The requirements in clauses (a) and (b) shall be in addition to the

requirements in paragraphs 2 (1) and (2).

3. Sampling and evaluation procedures

(1) Not with standing provisions in any other paragraphs, the sampling and

evaluation procedures to be adopted for checking compliance with the

provisions in the schedule shall be as per standard procedures in vogue

from time to time.

(2) Not with standing the provisions in paragraph 5, the following conditions

regarding the sampling and evaluation procedure to be adopted checking

compliance with the provision in this schedule are specified.

(a) For determination of the number of particles per cubicmeter in item 1(a)(i)

(1) in Table 2, samples are to be collected by standard or midget impringer

and the counts made by light field technique.

(b) The percentage of quartz in the 3 formulae given in item1 (A) (i) of Table 2

is to be determined from air borne samples.

(c) For determination of number of fibers as specified in item 2 (A) of Table 2,

the membrance filter method at 430 x magnification (4 mm objective) with

phase contrast illumination should be used.

(d) Both for determination of concentration and percentage of quartz for use of

the formula given in item 1 (a) (i) (2) of Table 2, the fraction passing

through a size selector with the following characteristics should only be

considered.

Aero dynamic diameter Percentage allowed by size-

(Unity density sphere) selector

2.0 20

2.5 75

3.5 50

5.0 25

10.0 0

4. Power to require assessment of concentration of substances

(1) An Inspector-cum-Facilitator may, by an order in writing, direct the

occupier of a factory to get before any specified date the assessment of

the time weighted average concentration at any work location of any of

the substances mentioned in tables 1, 2 or 3 carried out.

(2) The results of such assessment as well as the method followed for air

sampling and analysis for such assessments had be sent to the Inspector-

cum Facilitator within three days from the date of completion of such

assessment and also a record of the same kept readily available for

inspection by an Inspector-cum-Facilitator

5. Exemption

If in respect of any factory or a part of a factory, the Chief Inspector-cum-

Facilitator is satisfied: that, by virtue of the pattern of working time of the

workers at different work locations or on account of other circumstances,

no worker is exposed , in the air at the work locations , to a substance or

substances specified in Tables I, 2 or 3 to such an extent as is likely to be

injurious to his health, he (the Chief Inspector-cum-Facilitator)may by an

order in writing , exempt the factory or a part of the factory from the

requirements in paragraph 2, subject to such conditions, if any, as he may

specify therein.

TABLE: 1

Sl. Substances Permissible limits of exposure

No Time weighted Short term

average maximum

concentration concentration

(TWA)(8hrs) (STEL)(15min).

*

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 2 4.5 - -

(S.C)

6 Aldrin-skin - 0.25 - -

7 Allyl Chloride 1 3 2 6

8 Ammonia 25 18 35 27

9 Anilline-skin 2 10 - -

10 Anisidine 0.1 0.5 - -

(o,p-isomers)-Skin

11 Arsenic & soluble - 0.2 - -

Compounds (asAs)

12 Benzene (HC) 0.5 1.5 25 7.5

13 Beryllium & - 0.002 - -

compounds (asBe)

(S.C.)

14 Boron trifluoride-C 1 3 - -

15 Bromine 0.1 0.7 0.3 2

16 Butane 800 1,900 - -

17 2-Butanone (Methyl 200 590 300 885

ethylKetone-MEK)

18 n-Butyl acetate 150 710 200 950

19 n-Butylalcohol-Skin-C 50 150 - -

20 Sec / Tert Butyl acetate 200 950 - -

21 Butyl mercaptan 0.5 1.5 - -

22 Cadmium Dust sand - 0.05 - -

Salts (asCd)

23 Calcium Oxide - 2 - -

24 Carbaryl (Sevin) - 5 - -

25 Carbofuran - 0.1 - -

(Furadan)

26 Carbon disulphide- 10 30 - -

Skin

27 Carbon Monoxide 50 55 400 440

28 Carbon tetra 5 30 - -

chloride-

Skin (S.C)

29 Chlordane-Skin - 0.5 - 2

30 Chlorine 1 3 3 9

31 Chloro benzene 75 350 - -

(Mono chloro

benzene)

32 Chloroform (S.C) 10 50 - -

33 Bis 0.001 0.005 - -

(Chloromethyl)

ether (H.C.)

34 Chromic acid and - 0.05 - -

Chromates

(asCr)

35 Chromous salts - 0.5 - -

(as Cr)

36 Copper Fume - 0.2 - -

37 Cotton dust, raw - 0.2+ - -

38 Cresol, 5 22 - -

allisomers-

Skin

39 Cyanides - 5 - -

(asCN)-Skin

40 Cyanogen 10 10 - -

41 DDT - 1 - -

(Dichloro diphenyl

trichloro ethane)

42 DemetonSkin 0.01 0.1 - -

43 DiazinonSkin - 0.1 - -

44 Dibutyl phthalate - 5 - -

45 Dichlorvos (DDVP)- 0.1 1 - -

Skin

46 Dieldrin-Skin - 0.25 - -

47 Dinitro benezene (all 0.15 1 - -

isomers)-Skin

48 Dinitrotoluene-Skin - 1.5 - -

49 Diphenyl (Biphenyl) 0.2 1.5 - -

50 Endosulfan - 0.1 - -

(Thipdan)-Skin

51 Endrin-Skin - 0.1 - -

52 Ethylacetate 400 1,400 - -

53 Ethylalcohol 1,000 1,900 - -

54 Ethylamine 10 18 - -

55 Flurorides (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 0.1 0.1 - -

(S.C)

61 Hydrogen Chloride-C 5 7 - -

62 Hydrogen cyanide 10 10 - -

SkinC

63 Hydrogen Fluoride 3 2.5 - -

(as F)-C

64 Hydrogen peroxide 1 1.5 - -

65 Hydrogen sulphide 10 14 15 21

66 IodineC 0.1 1 - -

67 Iron Oxide Fume - 5 - -

(Fe2O3)(asFe)

68 Isoamyl acetate 100 525 - -

69 Isomyl alchohol 100 360 125 450

70 Isobutyl alcohol 50 150 - -

71 Lead, in org dust - 0.15 - -

sand fumes

(asPb)

72 Lindane-Skin - 0.5 - -

73 Malathion-Skin - 10 - -

74 Manganese (asMn) - 5 - -

dust and compounds

C

75 Manganese fume - 1 - 3

(as Mn)

76 Mercury

(asHg)-Skin

(i)Alkyl compounds- 0.01 - 0.03

(ii) All forms except alkyl - 0.05 - -

vapour

(iii)Aryland inorganic - 0.1 - -

compounds

77 Methyl alcohol 200 260 350 310

(Methanol)-Skin

78 Methylcellosolve 5 16 - -

(2-Methoxy

ethanol)- Skin

79 Methyl 50 205 75 300

isobutylketone

80 Methyl isocyanate- 0.02 0.05 - -

Skin

81 Nephthalene 10 50 15 75

82 Nickelcarbonyl 0.05 0.35 - -

(as Ni)

83 Nitric acid 2 5 5 10

84 Nitric oxide 25 30 - -

85 Nitro benzene-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 Parathionskin - 0.1 - -

90 Phenol-skin 5 19 - -

91 Phorate (Thimet)- - 0.05 - 0.2

Skin

92 Phosgene 0.1 0.05 - 0.2

(Carbonyl chloride)

93 Phosphine 0.3 0.4 1 1

94 Phosphoric acid - 1 - 3

95 Phosphorous - 0.1 - -

(yellow)

96 Phosphorous 0.1 1 - -

Pentechloride

97 Phosphorous 0.2 1.5 0.5 3

trichloride

98 Picricacid–Skin - 0.1 - 0.3

99 Phridine 5 15 - -

100 Silane 5 7 - -

(Silicon tetra

hydride)

101 Sodium hydroxide- - 2 - -

C

102 Styrene, monomer 50 215 100 425

(phenylethlene)

103 Sulphur dioxide 2 5 5 10

104 Sulphur hexa 1,000 6,000 - -

fluoride

105 Sulphuric acid - 1 - -

106 Tetraethyl lead - 0.1 - -

(asPo)-Skin

107 Toluene(Toluol) 100 375 150 560

108 O-Toludine- 2 9 - -

Skin(S.C)

109 Tributyl Phosphate 0.2 2.5 - -

110 Trichloro ethylene 50 270 200 1080

111 Uranium,natural - 0.2 - 0.6

(as U)

112 Vinyl chloride 5 10 - -

(H.C)

113 Welding fumes - 5 - -

114 Xylene 100 435 150 655

(o-, m-, p-isomers)

115 Zinc Oxide

(i)Fume - 5.0 - 10

(ii)Dust(Total dust) - 10.00 - -

116 Zicronium - 5 - 10

compounds

(as Zr)

ppm: Parts of vapour or gas per million parts of contaminated air by

volume at 250 C and 760 (mm of mercury)

mg/m3: milli gram of substance per cubic meter of air

* : Not more than 4 times a day with at least 60 min. interval between

successive exposure

**: mg / m3 = (Molecular weight X ppm )/ 24.45

Lint: free dust as measured by the vertical elutriator cotton-dust sampler

C : denotes ceiling limit

Skin: denotes potential contribution to the overall exposure by the cuteous

route including mucous membrane and eye

S.C: denotes suspected human carcinogens

H.C: denotes confirmed human carcinogens

TABLE: 2

Substance Permissible time weighed

average concentration

Silica,SiO2

(a) Crystalline

(i)Quartz

(1)In terms of dust count (10600)/(% Quartz + 10)mppcm

(2)In terms of respirable dust 10/(% respirable Quartz + 2)

Mg /m3

(3)In terms of total dust 30 /(% Quarts + 3) mg /m3

(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. 10 mg /

m3 , total dust

(b) Amorphous

Silicates having less than 1 % free Silica by weight

Asbestos fiber larger than

microns

0.5 fiber/cc***

(i)Amosite

1.0 fiber/cc ***

(ii) Chrystolite

(iii) Crocidolite 0.2 fiber/cc ***

(iv) OtherForm

2 fibers/cc

Mica 705 mpum.

Mineral Gool Fiber 10 mg/cu.m.

Perlite 1060 mppcm

Portland Cement 1060 mppcm

Soap Stone 705 mppcm

Table (Conabostiform) 705 mppcm

Talc (Fibrous) Same limit as for asbestos

Tromolit Same limit as for asbestos

Coal Dust

1 For air borne dust 5 mg / cu.m.

having less than 5%

silicon dioxide by weight

2. For airborne dust Same limits as prescribed by

having more than 5%

formula in item (2)

silicon dioxide

against quartz

Table: 3

Substance Permissible limit of

exposure

Pum mg / sq. m

Acetic anhydride 5 20

O- Dichloro benzene 50 300

Formaldehyde 2 7

Hydrogen Chloride 5 7

Manganese & -- 5

Compounds (as Mn)

Nitrogen Dioxide -- 9

Nitroglycerin-skin 0.2 2

Potassium hydroxide -- 2

Sodium hydroxide -- 2

2, 4, 6-Trinitrotaluence -- 0.5

(TNT)

***

(i) For fibre greater than 5µm in length and less than 5µm in breadth with

length to breath 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.

Portland cement 10mg/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 impinge samples

by light- field techniques.

As determined by the membrane filter method at 400-450xmagnification

(4mm objective) phase

Rules prescribed under Section 90: