Asian Journal of Atmospheric Environment

Korean Society for Atmospheric Environment (한국대기환경학회)
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Effect of Precipitation on Air Pollutant Concentration in Seoul, Korea

  • Kim, Suhyang (Department of Advanced Technology Fusion, Konkuk University) ;
  • Hong, Ki-Ho (Department of Advanced Technology Fusion, Konkuk University) ;
  • Jun, Hwandon (Department of Civil Engineering, Seoul National University of Technology) ;
  • Park, Young-Jae (Seung Young Technical Corporation) ;
  • Park, Moojong (Department of Civil Engineering, Hanseo University) ;
  • Sunwoo, Young (Department of Environmental Engineering, Konkuk University)
  • Received : 2014.10.24
  • Accepted : 2014.12.13
  • Published : 2014.12.31
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Abstract

In this study, long-term rainfall data with irregular spatial distribution in Seoul, Korea, were separated into individual precipitation events by the inter-event time definition of 6 hours. Precipitation washout of $PM_{10}$ and $NO_2$ concentrations in the air considering various complex factors were analyzed quantitatively. Concentrations of $PM_{10}$ and $NO_2$ in the atmosphere were lower under condition of rainfall compared to that of non-precipitation, and a noticeable difference in average $PM_{10}$ concentrations was observed. The reduction of concentrations of $PM_{10}$ and $NO_2$ by rainfall monitored at road-side air monitoring sites was also lower than that of urban air monitoring sites due to continuous pollutant emissions by transportation sources. Meanwhile, a relatively smaller reduction of average $PM_{10}$ concentration in the atmosphere was observed under conditions of light rainfall below 1 mm, presumably because the impact of pollutant emission was higher than that of precipitation scavenging effect, whereas an obvious reduction of pollutants was shown under conditions of rainfall greater than 1 mm. A log-shaped regression equation was most suitable for the expression of pollutant reduction by precipitation amount. In urban areas, a lower correlation between precipitation and reduction of $NO_2$ concentration was also observed due to the mobile emission effect.

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