Aircraft Measurements of gaseous pollutants(SO2, NOx and O3) in the Yellow Sea area, were carried out on 1997-2007. Main measurement site in 124°-127°E, 35°-37°N (in the Yellow Sea), have been done along the paths classified vertically and zonally. To understand how the air stream affects Long-range transboundary pollutants in Northease Asia (LTP), the tracks of pollutants in northeast Asia have been analyzed by dividing into 6 different regions(regions I-V and L). Compared with Korea's local sources and western north Pacific influenced by the Yellow Sea, when the air stream from region Ⅱ is dominant, the SO2 concentrations are 3-6times higher. In region Ⅱ and Ⅲ, SO2 concentrations are represented highest at 25.0 and 14.7 ppb, respectively. However, in other regions, SO2 concentration was recorderd the highest at 1.1-3.8 ppb, which is 7-15% higher then the highest one over the region Ⅱ and Ⅲ. During 1997-2007, the mean amount of incoming pollutants is 0.162 ton/km·hr exceeding about 5-times mean amount of outgoing pollutants over the West Sea. During the observed period, the amount of incoming and outgoing SO2 over the Yellow Sea is the highest in winter, at 0.224 ton/(km·hr) and 0.120 ton/(km·hr), respectively.