Air pollution has become the most concerned environmental problem in China. In this paper, the relationship between air pollution sources and pollutant concentration in Tianjin and Xingtai is studied by grey relational analysis model. It is found that the industrial system has the greatest impact on the air quality of Xingtai, while the resident population has the greatest impact on the air quality of Tianjin. The results show that the main pollution sources affecting air quality in different cities are not consistent. Therefore, different regions should take measures according to their own characteristics in the process of air pollution control.