Abstract
Nitrogen dioxide (NO 2 ) plays a very important role among the anthropogenic trace gases. The tropospheric NO 2 vertical column density (VCD) maps derived have been used to study many scientific applications, pollution emissions and pollutant distribution. During the 2008 Summer Olympic Games in Beijing, NO 2 is one main air pollutant which should be monitored. This paper presents the NO 2 inverse algorithm, the Differential Optical Absorption Spectroscopy (DOAS), from satellite measurements and the results using this method. The results show 1) the tropospheric NO 2 VCD in Beijing is about the same as that in other cities nearby in June, 2008; 2) from July 1, the tropospheric NO 2 VCD in Beijing decreases significantly, however, it changes little in other cities nearby; 3) the tropospheric NO 2 VCD in Beijing increases a little in August, 2008, which is much lower than that in other cities around, such as Tianjin, Tan g shan.
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