|This study was conducted to examine the monthly and seasonal variation of SO_2, TSP, O_3 concentration in Dongsamdong, Pusan coastal area. And the characteristics of air pollution of this area was compared to Kwangbokdong in Pusan and Taehadong in Ullungdo. Monthly mean concentration of SO_2 and TSP showed lower than Kwangbokdong, O_3 was higher than Kwangbokdong. In case of SO_2, seasonal variation of Dongsamdong was remarkabler than Kwangbokdong and the concentration difference of early morning and daytime was higher than Kwangbokdong, Taehadong showed very lower concentration as background area. In case of TSP, Dongsamdong was lower concentration and smaller diurnal change than Kwangbokdong, Taehadong showed very lower concentration as background area. In case of O_3, Dongsamdong was l0ppb higher than Kwangbokdong at daytime maximum concentration, diurnal change of concentration was higher, too. In case of frequency distribution of concentration, SO_2 and TSP at Dongsamdong showed higher frequency in low concentration class and O_3 showed in high concentration class as compared with Kwangbokdong.