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The atmospheric aerosols of PM 10 and PM 2.5 were collected at Gosan site of Jeju Island during 2012-2013. Their ionic and elemental species were analyzed in order to examine the composition variation of thehaze aerosols in accordance with the pathway of air mass. The concentrations of nss-SO 42− , NO 3− , and NH 4+ increased 2.1~3.7 times in coarse particle and 3.1~6.5 times in fine particle modes, respectively, showingespecially high NO 3− concentrations in fine particles during the haze days. The concentrations of S, Zn, Pband K increased 3.0~5.6 times in coarse particles and 3.2~7.7 times in fine particles during the haze days,on the other hand Al, Fe, and Ca concentrations were high only in coarse particles. Due to the back trajectoryanalysis, the concentrations of nss-SO 42− and NO 3− for haze days were high when the inflow pathway of airmass was from China, especially a high increase of NO 3− as through the south of China. The NO 3 /nss-SO 42 concentration ratio was relatively high in coarse mode as air mass inflow from China, but in fine mode itwas high as air mass passing through the Korean peninsula. :     2012~2013         .   nss-SO

Compositions of haze aerosols and their variation by inflow pathway of air mass at Gosan site in Jeju Island during 2012-2013