WATER & AIR

The BIS specifications for drinking water (IS: 10500-1983) are given below:

S. No.

Parameters / Substance

Max. Requirement / Desirable limit

1.

Color

10 Hazen units

2.

Turbidity

10 NTU

3.

pH

6.5 to 8.5

4.

Total hardness

300 mg/l

5.

Calcium

75 mg/l

6.

Magnesium

30 mg/l

7.

Copper

0.05 mg/l

8.

Iron

0.30 mg/l

9.

Chlorides

250 mg/l

10.

Sulfate

150 mg/l

11.

Nitrates

45 mg/l

12.

Fluoride

0.6 to 1.2 mg/l

13.

Mercury

0.001 mg/l

14.

Cadmium

0.01 mg/l

15.

Arsenic

0.05 mg/l

16.

Lead

01 mg/l

17.

Zinc

5.0 mg/l

18.

TDS

500-3000 mg/l

WHO (1984) recommended the following guideline value for the drinking water

S. No.

Parameters/Constituents

Guideline value

1.

Taste and Odor

Not offensive for most consumers

2.

Turbidity

5 NTU

3.

pH

6.5 to 8.5

4.

T. D. S.

1000 mg/l

5.

Hardness*

500 mg/l

6.

Color

15 true color units

7.

Chloride

250 mg/l

8.

Iron

0.3 mg/l

9.

Sulfate

400 mg/l

10.

Zinc

5.0 mg/l

11.

Copper

1.0 mg/l

12.

Fluoride

1.0 to 1.2 mg/l

*Total Hardness =(ppm Ca x 2.497) + (ppm Mg x 4.115) + (ppm Fe x 1.792) + (ppm Mn x 1.822)
Ambient Air quality standards (Central Pollution Control Board)
(Concentration in mg/m3)

Area Category

SPM

SO2

CO

NO3

A. Industrial and mixed use

500

120

5000

120

B. Residential and Rural

200

80

2000

80

C. Sensitive (hill stations, tourist resorts, parks, zoo, health resorts)

100

30

1000

30


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