Effect of Precipitation on Air Pollutant Concentration in Seoul, Korea
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 an...
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Veröffentlicht in: | Asian journal of atmospheric environment (Online) 2014, 8(4), , pp.202-211 |
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Sprache: | eng |
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Zusammenfassung: | 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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ISSN: | 2287-1160 1976-6912 2287-1160 |
DOI: | 10.5572/ajae.2014.8.4.202 |