The TSP aerosols were collected at Gosan site of Jeju Island between 2003 and 2007, and their aerosol components were analyzed to examine the variations of chemical compositions with the corresponding pathways of inflowing air parcels. According to the comparison of seasonal aerosol compositions, the soil-originated components showed remarkably high concentrations during spring season. On the other hand, the concentrations of anthropogenic components were somewhat high in spring and summer seasons, but low in fall season. Based on the comparison of TSP compositions in relation to the pathways of inflowing air mass, the concentrations of anthropogenic components (nss-SO 4 2-, S, NO 3 -), soil-originated components (nss-Ca 2+ + , Al, Fe, Ca), and the heavy metals (e,g., Mn, Zn, Cr, Pb, Cu, Cd, etc.) have relatively increased with the air mass moving from China continent into Jeju area. Meanwhile, the marine-originated components showed an increasing trend with the air mass coming from North Pacific Ocean. In the seasonal and sectional comparison, the nss-SO 4 2-, NO 3 -, nss-Ca, and Al showed comparatively high concentrations when the air mass moved from China continent during all seasons. Especially, the NO 3 -, nss-Ca 2+ + , and Al concentrations were somewhat high when the air mass moved from Korean Peninsula during summer season. It was also recognized that the Na + + concentration were high, when the air mass moved from Pacific Ocean through all seasons.

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Real-time monitoring of hourly atmospheric Radon-222 concentration and three daily monitoring of the secondary aerosol components of PM 10 were performed throughout 2011-2014 at Gosan station, Jeju Island, in order to characterize their background levels and temporal variation. The annual mean radon and PM 10 mass concentrations were 2326 AE 1198 mBq/m 3 and 37.1 AE 19.5 μg/m 3 , respectively. Based on cluster analyses of air mass back trajectories, the frequencies of air masses originating from continental China, the Korean Peninsula, and North Pacific Ocean routes were 53, 28, and 19%, respectively. When the air masses were transported to Jeju Island from continental China, the concentrations of radon and secondary aerosol components (nss-SO 4 2− , NO 3 − , NH 4 + ) were relatively high: 2577 mBq/m 3 and 14.4 μg/ m 3 , respectively. In cases when the air masses have moved from the Korean Peninsula, the corresponding concentrations were 2247 mBq/m 3 and 11.4 μg/m 3 , respectively. On the other hand, when the air masses came from the North Pacific Ocean, their radon and secondary aerosol concentrations decreased much further, 1372 mBq/m 3 and 10.5 μg/m 3 , respectively. Consequently, the variability of atmospheric radon concentrations at Gosan station might be characterized by synoptic changes in air mass fetch as well as diurnal changes in atmospheric mixing depth.

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