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| Last Updated:: 19/05/2017

Air Quality


Gangtok-Hospital dara

AIR POLLUTION

To prevent, control and abate air pollution in the country, the Government of India enacted Central legislation called the Air (Prevention & Control of Pollution) Act, 1981 (referred to as the Air Act, 1981). Every polluting industry must obtain a consent from the State Pollution Control Board for the discharge of air pollut­ants in any form through chimney or otherwise. The State Board may lay down suitable conditions while giving consent to discharge air pollutants in the light of emis­sion standards developed by the Central Board, subsequently notified through the rules framed under the Environment (pro­tection) Act, 1986 Rules.

 

Air Quality Monitoring of Gangtok town was initiated out un­der the project "Assessment of Pollution & Formulation of Action Plan during the year 2000-2001 and as per the report the air quality of Gangtok town is represented in the table.

Ambient Air Quality in and around Gangtok (Yearly Avg) in (mg/m3)

SL.No

Name of sites

Category

SPM

SO2

NO2

1

Tadong

Residential

108

16.2

15.7

2

Indira bye –pass

Commercial

137

17.4

22.6

3

Deorali

Residential

118

18.6

16.1

4

Bazar area (near Metro Point)

Commercial

145

22.3

20.4

5

Hospital point

Sensitive

122

19.6

18.6

6

Zero point

Sensitive

98

10.2

12.3

Source : State Pollution Control Board Sikkim (2016)

  

Oxides of Sulphur­: Eight hourly Sulphur dioxide concentration of the sample shows that Bazar area with 22.3 mg/mhas highest concentration on yearly average while the zero point shows minimum concen­tration with     10.2 mg/m3The other stations viz: Tadong (16.2 mg/m3), Indira bye-pass (7.4 mg/m3) Deorali (16.1 mg/m3), and Hospital Point (18.6 mg/m3).All the values are, however, within the prescribed limit.

 Oxides of Nitrogen­: The Eight hourly averages of Nitrogen oxides samples were collected and further analyzed in the lab. The result is presented in the table above. The highest concentration of oxides of Ni­trogen as NO2 was recorded from Indira Bye-pass with 22.6 mg/m3 followed by Bazar area (20.4 mg/m3), Hospital Point (18.6 mg/m3), Deorali (16.1 mg/m3), Tadong  (15.7 mg/m3and low­est was recorded from zero point with 12.3 mg/m3All the val­ues are however, within Indian standard.

Suspended Particular Matter (SPM)­: The yearly average of suspended particulate matter is pre­sented in table above. It can be inferred that Bazar area (near metro point) with 145mg/m3 of SPM has highest concentration while zero point with 98 mg/m3 shows minimum concentration of SPM. The highest value in Bazar area is mainly due to heavy vehicu­lar movement in this area. Tadong monitoring site recorded 108mg/m3 of SPM and like-wise Indira bye-pass (137 mg/m3), Deorali (118 mg/m3) and Hospital point (122 mg/m3).

 

 

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Ambient Air Quality of Seven Other Locations of Sikkim (Oct, 2016) new

 Industrial Air Quality of Sikkim (2015-16) new