| NO2 is a sort of minim gas in the atmosphere, but it has all-important infection for the circumstance and people's living. It is concerned with the action-chemistry reaction, and forms the acid rain, and is harm for the biology in ground and people's health. In this paper, there is the negative-correlativity between the concentration of NO2 and DN by using regression-analysis, due to the absorb-apex-paddy-structure of NO2 is blue-light-wave. On the basis of these, by using the different satellite's image, it has applied the model-maker of ERDAS to the studies of spatial model and the spatial-temporal distribution of atmospheric NO2 in Lanzhou city of Gansu province, China. By building the spatial-temporal distribution of NO2 and being combined of the social and economic data, it has analysis with the change-rule of atmospheric NO2 from 1986 to 2006. The results indicate:â‘ The spatial distribution of atmospheric NO2: It has the severity pollution of NO2 in the regions of Xigu, Anning and Yantan, the pollution-fountain is dominating of industrial-fountain and edaphic-fountain in these regions. But there is light pollution in Chengguan and Qilihe region, the pollution-fountain is dominating of the voiture-tail-gas (during the non-heating-time) and the resident-living pollution (during the heating-time).â‘¡The annual change of atmospheric NO2: The contaminative degree of atmospheric NO2 is downtrend from 1986 to 2006. The concentration of atmospheric NO2 is 0.086 mg/m3 in 1986, but it is 0.0459mg/m3 in 2006, the concentration reduces 0.0401mg/m3. However, the concentration of atmospheric NO2 is higher than the standard of country. The pollution of atmospheric NO2 is more serious in the city of Lanzhou.â‘¢The month change of atmospheric NO2: The concentration of atmospheric NO2 during the heating-time (January, February, March, November and December) is higher than the concentration during the non-heating-time. The concentration of atmospheric NO2 during August, September and October is lowest in the whole year. The concentration of atmospheric NO2 during October is 0.0423mg/m3 and is close to the standard of country.â‘£The quarter change of atmospheric NO2: The concentration of atmospheric NO2 during the firstly and the fourthly quarter is higher than the secondly and thirdly quarter, the concentration is more 0.0031mg/m3. The concentration during the firstly quarter is more 0.0024mg/m3 than the fourth, and the second is more 0.0014mg/m3 than the third. The concentration of atmospheric NO2 during the thirdly quarter is 0.0426mg/m3 in 2001, but it is 0.0437mg/m3 in 2006, the concentration increases 0.0011mg/m3, it is ascend trend. However, other quarter is 0.0517mg/m3, 0.0466 mg/m3, 0.0469 mg/m3 and reduces to 0.0487 mg/m3, 0.0451 mg/m3, 0.0463 mg/m3, it is downtrend. By studying the spatial distribution and temporal change of atmospheric NO2, it has offered a decision-making gist for watch, prevention and cure the atmospheric NO2 in the city of Lanzhou. At the same time, the study is precedent at home and also offers technological reference for after work.
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