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      https://www.ias.ac.in/article/fulltext/jess/128/08/0237

    • Keywords

       

      $\rm{PM_{2.5} and PM_{10}}$; diurnal and seasonal variation; meteorological parameters; dust event; long-range transport; concentration weighted trajectories

    • Abstract

       

      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.

    • Author Affiliations

       

      P BUCHUNDE1 2 P D SAFAI1 S MUKHERJEE1 P P LEENA1 D SIINGH1 G S MEENA1 G PANDITHURAI1

      1. Indian Institute of Tropical Meteorology, Pune 411 008, India.
      2. Department of Atmospheric and Space Sciences, Savitribai Phule, Pune University, Pune, India.
    • Dates

       
  • Journal of Earth System Science | News

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