전국 도시대기 측정망의 2000~2005년 PM10 농도 군집분석

Abstract

Variations in PM10 concentration between 2000 and 2005 from 84 urban air monitoring stations operated by thegovernment were analyzed. The K-means cluster analysis was attempted using annual average and the 99thpercentile of daily averages as parameters. The results obtained by excluding Asian dust episode days werecompared with those obtained by using all available data. In any cases, the cluster with the highest meanconcentration was mostly composed of stations in Seoul and Gyeonggi. Annual average of the cluster with thehighest mean concentration showed a distinct decreasing trend, but that excluding Asian dust episode days did notshow such a trend. Without Asian dust episode days high concentrations of monthly averages in March and Aprilwere also not observed. The effect of Asian dust was more pronounced in the 99th percentile of daily averages. The99th percentile of daily averages of the cluster with the highest mean concentration was the highest in Junefollowing downs in April and May.