Abstract

PM10 and PM2.5 samples were collected at the 1100 site of Mt. Halla in Jeju Island during 2011~2012, and their ionic and elemental species were analyzed, in order to investigate the characteristics of emission sources as well as aerosol compositions. The mass concentrations of PM10 and PM2.5 were 22.0±13.1 μg/m3 and 11.3±6.1 μg/m3, respectively, showing 2.4~2.6 times lower than those of the capital city area of Korea. The composition ratios of major secondary pollutants (nss-SO4 2−, NH4 +, and NO3 −) were the highest as 85.5 % for PM10 and 91.3% for PM2.5, and followed by the order of marine (Na+, Cl−, and Mg2+), organic acid (HCOO− and CH3COO−), and soil (nss-Ca2+) sources. Among the elemental species in PM10, soil-originated components (Al, Fe, and Ca) were consisted of 50.9 %, which was higher proportion than marine and anthropogenic elements. The acidification of the fine particulate matters was found to be influenced mostly by sulfuric and nitric acids, and these acids were mainly neutralized by calcium carbonate in PM10 and by ammonia in PM2.5. The clustered back trajectories showed that 47 % of total air mass inflows was from the China, and the concentrations of NO3 − and nss-Ca2+ were especially high corresponding to the inflows.