• D SIINGH

Articles written in Journal of Earth System Science

• Characterisation of particulate matter at a high-altitude site in southwest India: Impact of dust episodes

Observations on a particulate matter $\rm{(PM_{10}}$ and $\rm{PM_{2.5})}$ were carried out during March 2015 to February 2017 over a high-altitude location Mahabaleshwar in the Western Ghats region in southwest India. Apart from temporal variation of PM and the ratio of $\rm{PM_{2.5}/PM_{10}}$, impacts of local meteorological parameters on the concentration of PM are examined. $\rm{PM_{10}}$ showed a maximum concentration during pre-monsoon, whereas $\rm{PM_{2.5}}$ showed it in winter. The monsoon season showed the lowest concentrations for both $\rm{PM_{10}}$ and $\rm{PM_{2.5}}$. Concentrations were significantly reduced in 2016 due to the washout effect from enhanced rainfall during that year. Diurnal variations of PM were related to the variation in a planetary boundary layer, mountain valley winds as well as changes in different local sources. Dominance of primary particles was observed from the $\rm{PM_{2.5}/PM_{10}}$ ratio. The Central Pollution Control Board (CPCB) threshold limit for PM was exceeded on several days mainly during pre-monsoon due to transported dust from the Arabian Peninsula and Thar Desert apart from an increase in the tourist activity. A typical case for transported dust event during March 2016 is studied. Organics and sulphate particles showed a significant enhancement during dust event. Overall, the study indicated emissions from mixed sources for PM from local as well as distant source regions over Mahabaleshwar.

• # Journal of Earth System Science

Volume 130, 2021
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