Aerosol measurements in slant range in atmospheric boundary layer are performed by using a mobile pollution detecting lidar system (AML-1). The corresponding data processing method is introduced. By comparing the adjacent measurements performed by this mobile lidar in slant range and vertical range, the results show great feasibility of the slant-range measurement and data processing method. Two typical examples, aerosol extinction coefficients changing with height and time in 20° zenith angle and one two-dimensional scanning, are presented. These graphs show apparent space-time distribution of aerosol extinction coefficients, which is important to realize continual, simultaneous, large-ranged atmospheric pollution detection.