Air Quality Index of Major Towns across Sikkim

The State Pollution Control Board Sikkim has been conducting ambient air quality monitoring under the National Ambient Air Monitoring Programme in eight stations in the state of Sikkim. As per the latest AQI monitoring conducted during the year 2022 (January to December), the ambient air quality in the state has been well within the permissible limits as per the provisions of the Air (Prevention and Control of Pollution) Act, 1981. While AQI for majority of the towns are under 'Good' category, three major towns i.e Rangpo, Singtam and Deorali (Gangtok) in East Sikkim have fallen under 'Satisfactory' category which may be attributed to the fact that these towns are located in proximity to the National Highway NH10 which is subjected to heavy movement to vehicles.

 

SN	Name of Station	MONTHLY AQI FOR THE YEAR 2022 (January - December)
		Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
1	Rangpo, East Sikkim	64	62	71	72	77	69	67	62	54	60	58	59
2	Singtam, East Sikkim	62	58	66	58	56	58	61	60	59	64	59	63
3	Deorali, East Sikkim	50	46	66	60	54	38	41	38	35	34	50	57
4	Ravangla, South Sikkim	22	23	21	22	21	20	14	20	17	16	17	24
5	Namchi, South Sikkim	25	23	31	35	35	34	33	33	32	35	31	33
6	Pelling, West Sikkim	35	39	41	37	56	29	25	23	18	27	33	31
7	Mangan, North Sikkim	23	27	29	33	29	22	24	24	20	17	28	26
8	Chungthang, North Sikkim	25	25	27	28	28	24	22	21	22	20	25	33

 

 

   

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» Latest Weekly/ Monthly AQI details

National AQI Category and its associated health impacts

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National Air Quality Monitoring Programme (NAMP)

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 (Ptrotection) Act, 1986 Rules.

The air quality surveillance and monitoring is under taken to detect any deterioration in air quality arising from industrial, vehicular, residential and natural sources of pollution, as there are large seasonal variation in the concentration of various air pollutants. Air quality monitoring is the measurement of various pollutants to study the pattern and movement of air masses and deterioration of air quality. Monitoring programme helps in estimating the dynamic concentration levels of various pollutants from time to time, based on dispersal mode of original concentration at sources and at receptor end.

With a number of industrial units in the state mostly the pharmaceuticals and ancillary units, SPCB Sikkim under the National Air Monitoring Programme (NAMP) has established nine (09) nos. of Air Quality Monitoring (AQM) stations in order to monitor the air quality in the state. The state of Sikkim has been declared as the Air Pollution Control Area under Gazette notification no. 506 dated 08/09/2011. The details of the monitoring stations are as under:

SN	Name of monitoring station	Latitude o N	Longitude o E
1.	RANGPO	27.1736	88.5305
2.	SINGTAM	27.5144	88.4969
3.	DEORALI	27.3183	88.6063
4.	RAVANGLA	27.3075	88.363
5.	NAMCHI	27.17	88.35
6.	PELLING	27.3028	88.2344
7.	CHUNGTHANG	27.6033	88.6469
8.	MANGAN	27.5025	88.5358

*The 9th station located at Tashi View point, Gangtok has been damaged due to landslide and currently not in operation.

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Weekly Ambient Air Quality Data (AQI and Average PM₁₀, SO₂, NO₂) across Sikkim State at 8 (Eight) stations.

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Industrial Ambient Air Quality of Sikkim

» Industrial Air Quality of Sikkim (2015-16)