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Physico-chemical measurement of non-refractory submicron particles (NR-PM 1 ) was conducted in Baengnyeong Island, Korea using Aerodyne High Resolution Time of Flight Aerosol Mass Spectrometer (HR-ToF-AMS) from 2012 to 2014. Organics and ammoniated sulfate were dominant species in NR-PM 1 . The organics was found to have similar fractions (approximate 40%) of NR-PM 1 during the summer and winter, while the sulfate fractions of NR-PM 1 were calculated to be approximately 47% and 31% for the summer and winter, respectively, suggesting the possibility that particles provide non-acidic surfaces for condensation of nitric acid in the winter. The nitrate fractions of approximate 4% and 20% of NR-PM 1 were observed in August (summer) and November (winter), respectively, resulting that the relatively low concentration of sulfate in NR-PM 1 provided a non-acidic surface for nitric acid condensation and formation of particulate ammoniated nitrate is favored thermodynamically in winter. The new particle formation (NPF) event and particle growth rate were analyzed for each month in 2014 using 한반도 서부유입권역에서 대기 중 에어로졸 성분의 물리·화학적 특성 연구 III. 화학적 거동 및 장거리이동 125