Retrieving the vertical column density of NO2 by using multiaxis differential optical absorption spectroscopy technique.

A rigorous technique of monitoring the vertical column density (VCD) of NO₂ by using the scattered solar radiation is reported. By analyzing the optical path, the method of collecting the useful scattered solar radiation is achieved. By using this method, the collecting equipment and procedure of solar radiation could be greatly simplified. And through the actual measurement, it is proved that the VCD of NO₂ measured by using the scattered solar radiation is very close to that from the direct solar radiation. [ABSTRACT FROM AUTHOR]