Section 52A in Bihar Factories Rules, 1950

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State of Bihar - Section

Section 52A in Bihar Factories Rules, 1950

52A. [ Permissible levels in work environment. [Inserted by S.O. 686 dated 13.7.1988.] - 'Permissible levels of certain chemical substances in work environment'. With prejudice to the requirements in any other provisions in the Act or the Rules, the following requirements with respect to permissible levels of certain chemical substances in work environment shall apply to all chemical work:

(i)Definitions. - For the purpose of this clause-

(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 a substance per million parts of air volume at 25°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 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.]

The weighted average concentration	CT+	CT+	CT
11	22	nn
T+	T+	T+
2	2	m

Where C/1 represents the concentration of the substance for duration T/1 (in hours).C/2 represents the concentration of the substance for duration T/2 (in hours); and C/n represents the concentration of the substance for duration T/n (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.

(ii)Limits of concentrations of substances at work locations. - The time weighted average concentration of any substance listed in Table 1 or 2 of the clause, at any work vacation 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.

(iii)In the case of substance mentioned in Table 1 in respect of which a limit in form 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 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

(c)at no time, the concentration of the substance in the air shall exceed the limit of short term maximum concentration.

(iv)In the case of any substance given in Table 3, the concentration of the substance at any work location in factory at any time during any day shall not exceed the limit of exposure for substance specified in the table.

(v)In the cases where the word "skin" has been indicated against certain substances mentioned in Tables 1 and 3 appropriate measures shall be taken to prevent absorption through cutaneous routes particularly skin, mucous, membrances, and eyes as the limits specified in these. Tables are for conditions where the exposure is only through respiratory tract.

(vi)In case, the air at any work location contains a mixture of such substance mentioned in Tables 1, 2 and 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, are added together, the total shall not exceed unity.

C1 + C2 ... ... ... ... ... ... ... Cm shall not exceed unity when C1, C2. ... ... ... ... L1.. L2 Ln... ... ... ... ... ... Cn are the time weighted concentration of toxices, substances 1,2, ... and 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 respectively.

(vii)In the case the air at any work location contains a mixture of substances, mentioned in Tables 1, 2 and 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 substances:

Provided that the requirements in sub-clauses (vi) and (vii) shall be in addition to the requirements in sub-clauses (ii), (iii) and (iv).

(viii)Sampling and evaluation procedures. - (a) Notwithstanding provisions in any other paragraphs, the sampling and evaluation procedures to be adopted for checking compliance with the provisions in the clause shall be as per standard procedures in vogue from time to time or as approved by the Chief Inspector.

(b)Notwithstanding any other provisions the following conditions regarding the sampling and evaluation procedures relevant to checking compliance with the provisions in the clause are specified :-

(A)For determination of the number of particles per cubic meter 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 formula 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 membrances filter method at 430 x phase contrast 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 characteristic should only be considered.

Aerodynamic diameter(Unit density sphere).			Percentage allowed by Size-selector.
2.0	...	...	90
2.5	...	...	75
3.5	...	...	50
5.0	...	...	25
10.0	...	...	0

(ix)Power to require assessment of concentration of substance. - (a) An inspector may by an order in writing direct the Occupiers or Managers of factory to get before any specified date, the assessment of the time weighted average concentration at any work location at any of the substances mentioned in Tables 1, 2 or 3 carried out.

(b)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 maintained in the bound register and kept readily available for inspection by an Inspector.

(x)Exemption. - If in respect of any factory or a part of factory, the Chief Inspector 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 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 part of the factory from such requirements, subject to such conditions, if any, as he may specify therein.

Table 1

Substance		Permissible limits of exposure
	Time weighted average concentration.	Short-term maximum Concentration.
	ppm	mg/m3	ppm	mg/m3
1		2	3	4	5
Acetic Acid	...	10	25	15	7
Acrolein	...	0.1	0.25	0.3	0.8
Aldrin (Skin)	...	...	0.25	...	0.75
Ammonia	...	25	18	35	27
Aniline (Skin)	...	2	10	5	20
Anilidine (Opisomers Skin)	...	0.1	0.5	...	...
Arsenic & Compounds (as As)	...	...	0.2	...	...
Benzene	...	10	30	...	...
Bromine	...	0.1	0.7	0.5	2
2 Butanone (Methyl-Ethyl Ketone MEK)	...	200	590	300	885
n-Butyle Acetate	...	150	710	200	950
Sectert. Butyl Acetate	...	200	950	250	1190
Cadmium dust and salts (as Cd)	...	...	0.05	...	0.2
Calcium Oxide	...	...	2	...	...
Carbaryl (Sevin)	...	...	5	...	10
Carbofuran (Furadan)	...	...	0.1	...	...
Carbon disulphide (Skin)	...	20	60	30	90
Carbon monoxide	...	50	55	400	440
Carbon tetrachloride (Skin)	...	10	65	20	130
Carbonyl chloride (phosgene)	...	0.1	0.4	...	...
Chlordance (Skiri)	...	...	0.5	...	2
Chlorobenzene (monochloro-Bezene)	...	75	350	...	...
Chlorine	...	1	3	3	9
Bis-chloromethyl ether	...	0.001	...	...	...
Chromic acid and Chromites (as Cr.)	...	...	0.05	...	...
Chromium, Sel. Chormic Chromous	...	...	0.5	...	...
Salts (as Cr.)	...	...	...	...	...
Copper Fume	...	...	0.2	...	...
Cotton dust raw	...	...	0.2	...	0.6
Cresol, all isomers (Skin)	...	5.22	...	...	...
Cyanides (as CN)-(Skin)	...	...	5	...	...
Cyanogen	...	10	20	...	...
DDT (Dichloriodiphenyl trichloroethane)	...	...	1	...	3
Demeton skin	...	...	0.1	0.02	0.3
Diazinon-skin	...	...	0.1	...	0.3
Dibutyle Phthalate	...	...	5	...	10
Dichlorves (DD VP)-skin	...	0.1	1	0.3	3
Dield-rin-skin	...	...	0.25	...	0.75
Dinitro Benzene (all isomers-skin)	...	0.15	1	0.5	3
Dinitrotoluene-skin	...	...	1.5	0.6	4
Diphenyl	...	0.2	1.5	0.6	4
Endrin-skin	...	...	0.1	...	0.3
Ethyl Acetate	...	400	1000	...	...
Methyl Amine	...	10	18	...	...
Ethyl Amine	...	10	18	...	...
Ethyl Alcohol	...	1000	1900	...	...
Flourides (as F)	...	...	2.5	...	...
Flourine	...	1	2	2	4
Hydrogen cyanide-skin	...	10	1	15	16
Hydrogen Sulphide	...	10	15	15	27
Iron oxide from (Fe2O3 as Fe)	...	...	5	...	10
Isoamyl Acetate	...	100	525	125	655
Isobutyl Alcohol	...	50	150	75	225
Isoamyl Alcohol	...	100	360	125	450
Lead, inorg, fumes and dust (as Pb)	...	...	0.15	...	0.15
Linda-he-skin	...	...	0.5	...	1.5
Malathoion-skin	...	...	10	...	...
Manganese fume (as Mn)	...	...	...	1	3
Mercury (as Hg)	...	...	0.05	...	0.15
Mercury (aidyl compounds skin) (as Hg)	...	0.001	0.01	0.003	0.03
Methyl Alcohol (methanol) skin	...	200	260	250	310
Methyl collosove-skin (2-methoxy ethanol)	...	25	80	35	120
Methyl isobutyl Ketone-skin	...	100	410	125	510
Napthalene	...	10	50	15	75
Nickel carbonyl (as Ni)	...	0.05	0.35	...	...
Nitric Acid	...	2	5	4	10
Nitric Oxide	...	25	30	35	45
Nitrobenzine-skin	...	1	5	2	10
Oil mist-mineral	...	...	5	...	10
Parathion-skin	...	...	0.1	...	0.3
Phenol-skin	...	5	19	10	38
Phroate (Thimet)-skin	...	...	0.65	...	...
Phosgene (Carbonyl chloride)	...	0.1	0.4	...	...
Phosphine	...	0.3	0.4	1	1
Phosphorus (Yellow)	...	...	0.1	...	0.3
Posphorus pentachloride	...	...	1	...	3
Phosphorus trichloride	...	0.5	3	...	...
Picric acid-skin	...	...	0.1	...	0.3
Pyridine	...	5	15	10	30
Sila-ne (Sillicon tetrahydrine)	...	0.5	0.7	1	1.5
Styrene, monomer (phenyl, othylene)	...	100	420	125	525
Sulfur dioxide	...	5	15	...	...
Sulfuric acid	...	...	1	...	...
Toluene (toluo) skin	...	100	375	1545	560
O-Toludine	...	5	22	10	44
Trichloroethylene	...	100	535	150	800
Vinyl chloride	...	5	10	...	...
Wielding Fumes (NOC)	...	...	5	...	...
Xylene (o-m-p-isomers) skin	...	100	435	150	655

Table 2

Substance		Permissible time-weighted average concentration.
1		2
1. Silica-
(a) Crystalline-
(i) Quartz-
(1) In terms of dust count		{\|
1060% Quartz + 10\| mppCm

|-| (2) In terms of respirable dust||

10% respirable quartz + 2| Mg/m3

|-| (3) In terms of total dust||

30% quartz - 3| Mg/m3

|-| (ii) Cristobalite| ...| Half the limits given against quartz.|-| (iii) Tridymite| ...| Half the limits given against quartz.|-| (iv) Silica fused| ...| Same limit as for quartz.|-| (v) Tripoli| ...| Same limit as in formula in item 2 given against quartz.|-|| ...| 750 mppcm.|-| 2. Silicate having less than 1% free silca by weight-|||-| (a) Asbestos-fibres longer than 5microns-|||-| (i) Amosite| ...| 0.5 fibre/cubic centimeter.|-| (ii) Chrysolite| ...| 2 fibres/cubic centimeter.|-| (iii) Crocidolite| ...| 0.2 fibre/cubic centimeter.|-| (iv) Other form| ...| 2 fibres/cubic centimeter.|-| (b) Mica| ...| 705 mppcm.|-| (c) Mineral wool fibre| ...| 10 mg/m3|-| (d) Porlite| ...| 1060 mppcm.|-| (e) Portland cement| ...| 1060 mppcm.|-| (f) Soap stone| ...| 705 mppcm.|-| (g) Talc (non-abosti form)| ...| 705 mppcm.|-| (h) Talc (fibrous)| ...| Same limit as for asbestos.|-| (i) Tromolite| ...| Same limit as for asbestos.|-| 3. Coal dust-|||-| (1) For air born dust having lessthan - 2mg/m3|| 5% silicon dioxide by weight.|-| (2) For air-borne dust havingover 5% silicon dioxide.|| Same limit as prescribed by formula item (2) against quartz.|}Table 3

		Permissible limit of exposure.
Substance		ppm	mg/m3
1		2	3
Acetic an hydride	...	5	20
O-Dichlorobenzene	...	50	300
Formaldehyde	...	2	3
Hydrogen Choloride	...	5	7
Manganese 1 Compounds (as Mn)	...	...	5
Nitrogen-dioxide	...	5	9
Nitroglycerine-skin	...	02	2
Potassium hydroxide	...	...	2
Sodium hydroxide	...	...	2
2, 4, 6 - Trinitrotoluene (TNT)	...	...	0.5

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State of Bihar - Section

Section 52A in Bihar Factories Rules, 1950