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A novel system using the technique of concurrent multi-axisdifferential optical absorption spectroscopy system has beendeveloped and applied to the measurement of nitrogen dioxide in anurban environment. Using five fixed telescopes, slant columns ofnitrogen dioxide, ozone, water vapour, and the oxygen dimer,O4, are simultaneously retrieved in five vertically separatedviewing directions. The application of this remote sensing techniquein the urban environment is explored. Through the application ofseveral simplifying assumptions a tropospheric concentration ofNO2 is derived and compared with an urban backgroundin-situ chemiluminescence detector. Trends derived fromremote sensing and in-situ techniques show agreement towithin 15 to 40% depending on conditions. Owing to the high timeresolution of the measurements, the ability to image and quantifyplumes within the urban environment is demonstrated. The CMAX-DOASmeasurements provide a useful measure of overall NO2concentrations on a city-wide scale

Spatially resolved measurements of nitrogen dioxide in an urban environment using concurrent multi-axis differential optical absorption spectroscopy