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The average concentrations of PM10 in Gwangju decreased from 50 μg/m3 in 2008 to 45 μg/m3 in 2010, 41 μg/m3 in 2012 and 2014, and 40 μg/m3 in 2016. PM10 concentrations at Oseon-dong and Geonkun-dong were higher than those at other measurement sites. The backward trajectories for the sampling periods (2008-2016) were classified into three groups: (1) air masses related to long-range transport from China to Gwangju via the Yellow Sea (off the west coast of Korea) (clusters 1 and 2), (2) air masses related to local emissions From the Korean peninsula (clusters 3 and 4), and (3) air masses from the south (Cluster 5), The average concentrations of PM10 were 41.0, 48.1, 37.6, 43.3, and 33.3 for cluster 1,2,3,4, and 5, respectively. Cluster 2 had the highest PM10 concentration while cluster 5 had the lowest. Air masses fiom Cluster 1 and 2 were 29% and 13%, more frequent, respectively, during the entire period; the higher PM10 concentrations in these cases were influenced mainly by Beijing, Hebei, Shandong, Jiangsu, and Shanghai in China. This means that long-range transport aerosols contribute significantly to the PM10 concentration in Gwangju. Cluster 4, which was affected by many sources on the west coast area of Korea, also showed a high PM10 concentration; the slow floe of the air mass contributed to this. Therefore, the high concentration of PM10 in Gwangju area is influenced comprehensively by long-range transport, local emissions and the condition of the flow of the air mass.

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