Effect of Precipitation on Air Pollutant Concentration in Seoul, Korea

Asian Journal of Atmospheric Environment - 2014
Suhyang Kim1, Ki-Ho Hong1, Hwandon Jun2, Young-Jae Park3, Moojong Park4, Young Sunwoo5
1Department of Advanced Technology Fusion, Konkuk University, Seoul, Korea
2Department of Civil Engineering, Seoul National University of Technology, Seoul, Korea
3Seung Young Technical Corporation, Seoul, Korea
4Department of Civil Engineering, Hanseo University, Chungcheongnam-do, Korea
5Department of Environmental Engineering, Konkuk University, Seoul, Korea

Tóm tắt

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 PM10 and NO2 concentrations in the air considering various complex factors were analyzed quantitatively. Concentrations of PM10 and NO2 in the atmosphere were lower under condition of rainfall compared to that of non-precipitation, and a noticeable difference in average PM10 concentrations was observed. The reduction of concentrations of PM10 and NO2 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 PM10 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 NO2 concentration was also observed due to the mobile emission effect.

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Asian Journal of Atmospheric Environment

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