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Air pollution by acid pollutants is problematic in the whole world. Water acidification has alreadybeen deteriorating the forest ecosystem. This study was conducted to analyze the acidity and chemicalcomposition of the open precipitation and throughfall at forests with various geographic locations inKorea. The results of this study are as follows; The open precipitation pH was lowest in Seochun. Thethroughfall pH showed some buffering capacity in only Quercus mongolica stands. In Pinusrigida(Shingal and Seochun) stands, there was little difference from the open precipitation. Chemicalcomposition of the open precipitation for each sampling site showed that Ca2+, NH4+ and SO42-concentrations had higher value than other ions, and except these ions, the small quantity of ionsshowed different properties to each site. Changes of ion concentrations in the throughfall showed atendency to increase. Ion concentrations of the throughfall increased with washout and nutrientleaching from the tres. In conclusion, the influence was extended to the pure zone, and the frequencyof acid rain is increasing. But, if the deposition of pollutants exceeds the capacity of purification, itwould damage forest ecosystem. Further investigations are necessary to identify tolerant tree speciesto acid pollutants.