Abstract
This paper investigates the characteristics of high <TEX>$PM_{2.5}$</TEX> episodes occurred at Anmyeondo area in spring time, 2009. The monthly mean <TEX>$PM_{2.5}$</TEX> concentration during April was the highest in the year and especially, high levels of <TEX>$PM_{2.5}$</TEX> exceeding standard regulation level were sustained consecutively during 5 to 13 April. To analyze more detailed <TEX>$PM_{2.5}$</TEX> characteristics, numerical simulations were carried out using CMAQ(Community Multi-scale Air Quality) with IPR(Integrated Process Rate) and DDM-3D(Decoupled Direct Method). <TEX>$PM_{2.5}$</TEX> level was lower in daytime than that in nighttime due to vigorous vertical mixing during daytime. The chemical composition was showed that ratio of primary ion components such as sulfate(<TEX>$SO_4{^{2-}}$</TEX>), nitrate(<TEX>$NO_3{^-}$</TEX>) and ammonium(<TEX>$NH_4{^+}$</TEX>) were nearly half of total amount of <TEX>$PM_{2.5}$</TEX>. Aerosol and transport process dominantly contributed to <TEX>$PM_{2.5}$</TEX> concentration in Anmyeondo area and contribution rate of local emissions was nearly zero since Anmyeondo area has rare anthropogenic PM emission sources. DDM-3D analysis result showed that <TEX>$PM_{2.5}$</TEX> in Anmyeondo area was influenced by emissions from Shanghai and Shandong region of China.
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