Abstract
In recent years, air pollution has become an important issue with the development of urbanization projects in China. In this paper, we analyze the air quality problems of 31 major cities in China using principal component analysis and technique for order preference by similarity to an Ideal Solution. we analyze the data of air quality with respect to the environmental impact factors of major cities in China and make effort to derive the main factors that affect the air quality in China. In addition, we conducted research on the comprehensive ranking of air quality in all cities in China and finally demonstrate the thermodynamic diagram of air quality of Chinese cities through the TOPSIS method.
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