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Volume 15, No. 6, November 2015, Pages 2320-2324 PDF(305 KB)  
doi: 10.4209/aaqr.2014.12.0328   

Why Does Rain Increase the Concentrations of Environmental Bioaerosols during Monsoon?

So Mi Kang, Ki Joon Heo, Byung Uk Lee

Aerosol and Bioengineering Laboratory, Department of Mechanical Engineering, College of Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea


  • Rain increased the concentration of bioaerosols in air environments.
  • Four hypotheses for the effect of rain on bioaerosols were tested via experiments.
  • Transportation of bioaerosols can increase the concentration during rain events.
  • Reduction of UV irradiation intensity can increase the concentration of bioaerosols.



Rain has been known to remove aerosol particles from the atmosphere; however, it was recently discovered that rain events during monsoon increase the concentrations of culturable bioaerosols in ground-level air environments. To explain this phenomenon, several hypotheses were tested via bioaerosol measurement experiments in this study. The experimental measurements with limited variations of environmental conditions revealed that the phenomenon of the effect of rain on bioaerosols might be caused by the transportation of bioaerosols by falling raindrops from higher altitude to the ground, where the bioaerosols accumulate, as well as by the decrease in UV irradiation intensity during rain events. We studied the effects of several environmental parameters on bioaerosol concentrations.



Keywords: Rain; Bioaerosol; Monsoon; Concentration; PM10.



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