DIAL Measurements of SO2, NO2, And O3 in Beijing Zhang Yinchao, Hu Huanlin, Tan Kun, Liu Xiaoqin, Shao Shisheng, Yang Gaochao, Deng Min, Zhang Gaoyong, and Yang Lujun (Atmospheric Optics Lab, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031) Abstract: We performed some measurements of SO2, NO2, and O3 from 27 Dec. 2001 to 27 Jan. 2002 in Beijing, by using a mobile differential absorption lidar system. This DIAL system was developed at Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences. It was the first measurement of air pollution in planetary boundary layer of Beijing by DIAL. Key words: SO2, NO2, O3, DIAL, Beijing