Schedule E

(See rule 67)

Definitions. —For the purpose of this schedule

a. "mg/m3" means milligrams of a substances per cubic metre of air ;

b. "mppem" means million particles of a substance per cubic metre of air ;

c. "ppm" means parts of vapour orgas per million parts of air by volume at

25 degrees centigrade and 760 mm of mercury pressure;

d. "Time weighted average concentration" means the average concentration

of a substance inthe air at anywork location in a factory computed from

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

spread over the entire shift on any 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 C1T1 +C2T2+CnTn average concentration

T1+T2 +.

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)

; andCn 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 concentration of substances at work location. -

1. The time weighted average concentration of any substance listed in table 1

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

any 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 shall

not be less than 60 minutes; and

(2)

(3)

(4)

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

limit of short-term maximum concentration.

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.

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 specified in these Tables are for

conditions where the exposure is only through respiratory tract.

In case, the air at any work location contains a mixture of such substances

mentioned in Table 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 thesetime weighted concentration divided by the

respective permissible time weighted average concentration specified in the

abovementioned Tables, and the fractions obtained are added together,

the total shall not exceed unity.

i.e. C1+ C2+ Cn should not exceed unity L1 L2 Ln

Where C1, C2

Cn are the time weighted concentration

of toxic substances 1, 2..•••••••...and n respectively,

determined after measurement at work location;

and L1, L2

Ln are the permissible time weighted average

concentration of the toxic substances 1, 2.......and n respectively;

3.

b. Incase the air at any work location contains a mixture of substances,

mentioned in Table 1, 2, 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 requirement in clauses (a) and (b) shall be in addition to the

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

Sampling and evaluation procedures. -(1) Notwithstanding 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.

(1) Notwithstanding the provisions in paragraph 5, the following conditions

regarding the sampling and evaluation procedures relevant to checking

compliance with the provisions in the schedule are specified: -

4.

5.

a. For determination of the number of particles per cubic metre in item 1

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

impinger and the counts made by light field technique;

b. The percentage of quartz in the 3 formulae given in item 1(a)(i) of

Table 2 is to be determined from air borne samples ;

c. For determination of number of fibres as specified in item 2(a) of Table

2, the membrane filter method at 430 x magnification (4mm 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 asize select or with the following characteristics

should only be considered:

Aerodynamic

diameter

Percentage

allowed

(unit density sphere)

by size

selector

2.0

2.5

3.5

5.0

10.0

Power to require assessment of concentration of substances.-(1) An

Inspector may, by an order inwriting, direct the occupier or manager 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 Table 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 assessment shall be sent to the Inspector

within 3 days from the date of completion of such assessment and also a

record of the same kept readily available for inspection by an Inspector.

Exemption.-If in respect of any factory or a part of a factory, the Chief

Inspector is satisfied that, by virtue of the pattern of working time of the

workers at different work locations or an account of other circumstances, no

worker is exposed, in the air at the work locations, to a substance or

substances specified in Tables 1, 2 or 3 to such an extent as is likely to be

injurious to his health, he (the Chief Inspector) 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.

1E1

Substances

Acetic acid

Acrelein

Aldrin-skin

Ammonia

Aniline-skin

Anisidine

(o-poisoners)-skin

Arsenic and

compounds (as)

Benzene

Bromine

2 Butanere: Methylethyl

Ketone - MEK

TABLE

Permissible limits of exposure

Time weighted

Short-term maximum

average concentration

concentration

ppm

mg/m"

0 25

ppm

mg/m

0.25

0.75

0.5

0.7

Sahstances

Pennissible limits of exposure

Time-weighted

Shott-lemm maximtat

average concentration

concentration

myin!

ppm

my/m h

1190

Butyl acetate

sec/tert Butyl acetate

Cadmum-dust and

salts (as Cd)

Calcium Oxide

Carbaryl (Sovin):

Carbofiaan (Furadan)

Carbon disnlphıde-skın

Carbon monoxide

Carbon tetrachlonide-skın

Carbonylchloride

(Phosgene)

Chlordane-skin

Chlorobenzene

(mono chlord- berizene)

Chiorinc

bus-Chioromethylether

Chromsc acid and

chromates (as Cr)

Chromium. Scl-Chromic.

Chromous salts (as Cr)

Copper fume

Cotton dust, raw

Cresol, all isomers-skin

Cyanides, (as CNfskin

Cyanogen

50.

0.1

1.

Sabstances

DDT (Dichlorodiphenyl-

trichiore-ethane)

Demeton-skin

Diazion-skin

Dibutyl phthalate

Dichlorves (DDVP)-skm

Deldrn-skin

Dintrobenzene

(all isomers) skin

Dinitrotoluene-skin

Diphenyl

Endosulfan (Thodin)-skin

Endrin-skin

Ethyl mectate

Ethyl alcohol

Ethyl amine

Flourides (as F).

Flourine

Hydrogen Cyanide-skin

Hydrogen sulfide

Iron oxide fume

(Fe203 as Fe)

Isoamyl acetate

Iscamyl alcohol

Bobutylalcoll

Lead, morg. fumes

and dusts (as Pb)

Permisshile limits at'exposure

pom

inc-weighter

verage concentratio

mgm'

Shat-term masimum

concentration

ppm

mg/m"

0.15

0.25

0.03

0.75

0.

4(00

1000

1900

0.15

0.45

Suhstanices

Eindane-skin

Mala thinn-skm

Manganese fume fas Mn)

Mercury (as Hg)

Mercury (alkyl compounds) 0.001

-skin (as Hg)

Methyl alcohol

(methanol) skin

Methyl cellosolve-skın

(2-methosy ethanol)

Methyl isobutyl ketone-skin

Naphthalene

Nickel carbonyl cas Ni)

Nanc aed

Nitric oxide

Nitrobenzene-skin

Oil mist-mineral

Parathion-skin

Phenel-skin

Phorate (Thimet)-skin

Phosgene (Carbonyl chloride)

Phosplune

Phosphorous (vellow)

Phosphorous pentachloride

Phosphorous trichloride

Picric acid-skin:

Pyridine

Permissible limits of exposure

Time-werghted

тнит-тетт maхиnи

average concentration

ancentratic

mgm"

ppm

10:

0.05

0:003

O N

0 35

u ve y vi

0:05

0,4

0 15

0.03

0.

.i

0.3

0.5

0.2

Substances

Permissitte lumuts of exposure

Time-weighted

Shot-erm maximum

average concentration.

concentration

ppi1

mg/m"

pprm

mgm"

Silane (silicon tetrahy dride) 0.5

0.7

Styrene, monomer

(phenyl-ethylene)

Sulphur dieside

Sulphunc ackl

Toluene (toluol)-skın

O-Toludine

Trichloroethylene

Vinyl chloride

10:

Welding fumes (NOC)

Xylene (o-m-isomers)-skin

TABLE 2

Permissible time weighted averagec oncentration

Substance

1 Silica

(a)Crystalline

(0 Quirtz

() In terms of dust count = %Qurtz+10

(2) In terins of resprrahie dust

B) In termsoftotal dust

30.

% quartz + 3

mg/m'

10601

_mppcm

mg/n

• tespirable quantz +

(ii) Cristobalite

(mi) Tridymite

(iv) Silcafused

(v) Irpol

Half the he nits grien aguinst quartz

Half the limts given aganst quartz

Same limit as for quartz

amo limut as in formula mitem

ıven agaınsl quarı

Substance

Permissible time weighted average oncentration

(h) Amocphous

705mppcm

2. Silicate having less than 1% free silica by weight

(a) Asbestos (libres longer than

2 fibres/cubic centimetre

5 microns)

(b) Mica

Ye) Mineral Wool tihre

(d) Porlite

(c) Port land cement

(1) Soapstone

(g) Talc (nonobostiform)

(h) Talc (fibrous)

(i) Tromolite

705 mppcm

10 mg/m

1060 mpрсm

1060 mppem

705 mррсm

705 mppcm

Same limit as for asbestos

Same limit as for asbestos

3. Coaldust

(1) For arborne dust having less than 5 % silicon dioxide by weight

(2) For airborne dust having over

5% silicon dioxide

2mg/m3

Same limit as prescribed by

formula in item (2 )against quartz

TABLE 3

Substance

Permissible limit of' exposure

ppm

my/m3

300)

Acetic anhydride

O-Dichlorobenzene

Formakiehyde

Hydrogen Chloride

Manganese & compounds (as Mn)

Nitrogen dioxide

Nitroglycerin-skin

Potssium hydroxide

Sodium hydroxide

2. 4. 0- Trinutrotoluene (TNT)

0.2