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The number concentrations and the water soluble ionic concentrations of PM 2.5 have measured at Gosan site in Jeju, Korea, from March 2010 to December 2010, to clarify their characteristics. PM 2.5 number concentrations vary from 22.57 to 975.65 particles/ ㎝ 3 with an average value of 240.41 particles/ ㎝ 3 , which have been recorded evidently high in spring season as compared with those in other season. And the concentrations in small size ranges are greatly higher than those in large size ranges, so the number concentration in the size range 0.25 ∼ 0.45 ㎛ has more than 94% of the total number concentration of PM 2.5 . The major ionic components in PM 2.5 are SO 42- , NH 4+ and NO 3- , which are mainly originated from anthropogenic sources, on the other hand, the concentrations of Cl - , K + , Ca 2+ and Mg 2+ are recorded relatively lower levels. The concentrations of the major ionic components are very high in spring season, but the concentration levels of the other components are recorded significantly high in winter season. On the other hand, in summer season, the lowest concentration levels are observed for overall components as well as the sum of them. The concentration ratios of nss-SO

Comparison of the Number Concentration and the Chemical Composition of the Atmospheric PM2.5in Jeju Area

Comparison of the Number Concentration and the Chemical Composition of the Atmospheric PM_2.5in Jeju Area