National Ambient Air Quality Standards


Pollutants
Time weighted average
Concentration in ambient air
Industrial Area
Residential, Rural & other Areas
Sensitive Area
1
2
3
4
5
Sulphur Dioxide(SO2)
Annual Average*
80 µg/m3
60 µg/m3
15 µg/m3
24 hours****
120 µg/m3
80 µg/m3
30 µg/m3
Oxides of Nitrogen as NO2
Annual Average*
80 µg/m3
60 µg/m3
15 µg/m3
24 hours****
120 µg/m3
80 µg/m3
30 µg/m3
Suspended Particulate Matter (SPM)
Annual Average*
360 µg/m3
140 µg/m3
70 µg/m3
24 hours****
500 µg/m3
200 µg/m3
100 µg/m3
Respirable Particulate Matter (RPM) (size less than 10 microns)
Annual Average*
120 µg/m3
60 µg/m3
50 µg/m3
24 hours****
150 µg/m3
100 µg/m3
75 µg/m3
Lead
Annual Average*
1.0 µg/m3
0.75 µg/m3
0.50 µg/m3
24 hours****
1.5 µg/m3
1.0 µg/m3
0.75 µg/m3
Ammonia1
Annual Average*
0.1 mg/m3
0.1 mg/m3
0.1 mg/m3

24 hours****
0.4 mg/m3
0.4 mg/m3
0.4mg/m3
Carbon Monoxides
8 hours**
5.0 mg/m3
2.0 mg/m3
1.0 mg/m3
1 hours
10.0 mg/m3
4.0 mg/m3
2.0 mg/m3
*
Annual Arithmetic mean of minimum 104 measurements in a year taken twice a week 24 hourly at uniform interval.
**
24 hourly/ 8 hourly values should be met 98% of the time in a year. However, 2% of the time, it may exceed but not on two consecutive days.Annual Arithmetic mean of minimum 104 measurements in a year taken twice a week at uniform interval.
NOTE:
1. National Ambient Air Quality Standard: The levels of air quality with an adequate margin of safety, to protect the public health, vegetation and property.
2. Whenever and wherever two consecutive values exceeds the limit specified above for the respective category, it would be considered adequate reason to institute regular/ continuous monitoring and further investigation.
S.O. 384(E), Air (Prevention & Control of Pollution) Act, 1981, dated April 11, 1994] [EPA Notification: GSR 176(E), April 02, 1996].
1. Include vide Notification SO.955(E), Air (Prevention & Control of Pollution) Act, 1981, dated October 14, 1998]

Ambient Air Quality Standards in Respect to Noise
ZONE CODE
ZONE
LIMITS IN dB(A)
DAY TIME
(6 AM TO 9 PM)
NIGHT TIME
(9 PM TO 6 AM)
(A)
Industrial
75
70
(B)
Commercial
65
55
(C)
Residential
55
45
(D)
Silence
50
40




Indian Standard Specifications for Drinking Water is : 10500 - 1983.

Sl. No.
Substance or Characteristics
Requirement Desirable Limit
Undesirable Effect Outside the Desirable Limit
Desirable/
Essential
Remarks
1.
Colour, Hazen Units, Max.
--
Above 10
Essential
May be extended to 50 only if toxic substances are not suspected in absence of alternative sources.
2.
Odour
Objectionable
--
Essential
a)Test cold and when heated.
b)Test at severaldilutions.
3.
Taste
Agreeable
--
Essential
Test to be conducted only after safety has been established.
4.
Turbidity, NTU, Max.
10
Above 10, Consumer acceptance decreases.
Essential
May be extended upto 25, in absence of alternative sources.
5.
pH Value
6.5 to 8.5
Beyond this range the water will affect the mucous membrane and/or water supply system.
Essential
May be relaxed upto 9.2 in absence of alternative sources.
6.
Total Hardness (as CaCO3) mg/l Max.
300
Encrustation in water supply structure and adverse effects on domestic use.
Essential
May be extended upto 600 in the absence of other sources.
7.
Calcium (as Ca), mg/l, Max.
75
Encrustation in water supply structure and adverse effects on domestic use.
Desirable
May be extended upto 200, in the absence of other sources.
8.
Magnesium (as Mg), mg/l, Max.
30
Encrustation in water supply structure and adverse effects on domestic use.
Desirable
May be extended upto 100, in the absence of other sources.
9.
Copper (as Cu), mg/l, Max.
0.05
Astringent taste, dis-colouration and corrosion of pipes fittings and utensils will be caused beyond this.
Desirable
May be relaxed upto 1.5.
10.
Iron (as Fe), mg/l, Max.
0.3
Beyond this limit taste/appearance are affected & has adverse effect on domestic uses and water structures, and promotes iron bacteria
Essential
May be extended upto 1.0 in absence of alternative sources.
11.
Manganese (as Mn), mg/l, Max.
0.1
Beyond this limit, taste/appearance are affected on domestic uses and water supply structure.
Desirable
May be extended up to 0.5 where alternate source is not available.
12.
Sulphate (as SO4), mg/l, Max.
250
Beyond this causes gastrointestinal irrigation when magnesium of sodium are present .
Essential
May be extended up to 400 provided magnesium (as Mg) does not exceed 30.
13.
Chloride (as Cl), mg/l, Max.
250
Beyond this limit, taste, corrosion and palatability are affected
Essential
May be extended up to 1000 in the absence of other alternate sources.
14.
Nitrate (as NO3)mg/l, Max.
45
Beyond this mathemoglobinaemia takes place.
Desirable
No relaxation
15.
Fluoride (as F), mg/l
0.6 to 1.2
Low floride level are linked with dental carries above 1.5 it may cause fluorosis.
Desirable
If the limit is below 0.6 water source should be rejected but suitable public health measures should be taken.Maximum limit may be extended to 1.5 if no better alternate source is available.
16.
Phenolic Compounds (as C6H5OH), mg/l, Max.
0.001
Beyond this it may cause objectionable taste and odour.
Desirable
May be relaxed up to 0.002.

17.
Mercury (as Hg) mg/L, Max.
0.001
Beyond this the water becomes toxic.
Desirable
No relaxation of this limit is allowed to be tested when pollution is suspected.
18.
Cadmium (as Cd), mg/l, Max.
0.01
Beyond this the water becomes toxic.
Desirable
No relaxation of this limit is allowed to be tested when pollution is suspected.
19.
Selenium (as Se) mg/l, Max.
0.01
Beyond this the water becomes toxic.
Desirable
No relaxation of this limit is allowed to be tested when pollution is suspected.
20.
Arsenic (as as) mg/l, Max.
0.05
Beyond this the water becomes toxic.
Desirable
No relaxation of this limit is allowed to be tested when pollution is suspected
21.
Cyanide (as Cn) mg/l, Max.
0.05
Beyond this the water becomes toxic.
Desirable
No relaxation of this limit is allowed to be tested when pollution is suspected
22.
Lead (as Pb), mg/l, Max.
0.1
Beyond this the water becomes toxic.
Desirable
No relaxation of this limit is allowed to be tested when pollution is suspected
23.
Zinc (as Zn), mg/l, Max.
5.0
Beyond this limit it can cause astringent taste and an opalescence in water.
Desirable
May be relaxed up to 10.0. To be tested when pollution is suspected.
24.
Anionic detergents (as MBAS), mg/l, Max.
0.2
Beyond this limit it can cause a light froth in water.
Desirable
May be relaxed up to 1.0. To be tested when pollution is suspected.
25.
Chromium (as Cr+6) mg/l, Max.
0.05
May be carcinogenic.
Desirable
--
26.
Mineral Oil, mg/l, Max.
0.01
Beyond this limit undesirable taste and odour after chlorination takes place.
Desirable
May be relaxed up to 0.03. To be tested when pollution is suspected
27.
Residual free chlorine mg/l, Max.
0.2
--
Essential
To be applicable only when water is chlorinated. Tested at consumer end. When protection against viral infection is required, it should be min. 0.5 mg/L.

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