A DIAL (Differential Absorption Lidar) system for NO
2 monitoring was developed using a flash-lamp pumped dye laser. It was used to measure NO
2 concentration in a stack plume. Two wavelengths, resonant (463nm) and off-resonant (466nm) to the NO
2 absorption, were switched every two seconds in the measurement ; this gave an accuracy of 0.03 ppm for NO
2 concentration with 120m range resolution up to 500m by integrating signals for 4minutes. The sources of measurement error were investigated and the main source of error was shown to be the fluctuation of atmospheric aerosol concentration. It was pointed out that simultaneous measurement at two wavelengths should improve the accuracy of the measurement.
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