Suneja, Jagriti and Kotnala, Garima and Kaur, Amarjeet and Mandal, T. K. and Sharma, S. K. (2020) Long-Term Measurements of SO2 Over Delhi, India. Mapan, 35 (1). pp. 125-133. ISSN 0970-3950

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Abstract

Long-term measurements (2011-2018) of ambient sulphur dioxide (SO2) and meteorology were carried out at an urban site of Delhi, India, to study the seasonal and inter-annual variations of SO2 over Delhi. The average mixing ratio of SO2 was estimated as 2.26 +/- 0.48 ppb for the entire study period. Mixing ratio of ambient SO2 was estimated as 2.19 +/- 0.64 ppb, 2.07 +/- 0.89 ppb, 2.49 +/- 1.05 ppb and 2.27 +/- 0.71 ppb during winter, pre-monsoon, monsoon and post-monsoon seasons, respectively. SO2 mixing ratio was recorded maxima during monsoon (2.49 +/- 1.05 ppb) season, whereas minima during pre-monsoon season (2.07 +/- 0.89 ppb). The mixing ratio of SO2 showed slightly increase in the trend during observational period. Surface wind speed and wind directions analysis indicates the influence of local sources on the mixing ratio of SO2 at the study site. Backward trajectories and potential source contributing factor (PSCF) analysis also showed the local as well as the regional sources (industrial activities, coal burning and thermal power plants etc.,) influencing the mixing ratio of SO2 over Delhi.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Springer Verlag.
Subjects:	Instruments/ Instrumentation Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	23 Mar 2022 11:33
Last Modified:	23 Mar 2022 11:33
URI:	http://npl.csircentral.net/id/eprint/4793

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