Vertical concentration profiles of SO2, O3, and NO2 in the lower troposphere were measured by a multiwavelength differential absorption lidar (DIAL) system. SO2 concentration profiles were measured for vertical range 2000-4000m by 3-wavelength dual-DIAL, and results showed that the effect of O3 can be eliminated by an appropriate selection of wavelengths. The measurement accuracy for dual-DIAL was estimated to be 1 ppb for 150m range resolution. O3 and NO2 concentration profiles were measured simultaneously for vertical range 1500-2500m with a measurement accuracy of about 6 ppb for 150m range resolution. These results show that the system is capable of high resolution measurement of a single species by dual-DIAL or simultaneous measurement of two species by conventional DIAL.
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