Abstract:After the revision of the ambient air quality standard in 2012, the monitoring index and frequency of air pollutants have changed, which affects the urban air quality evaluation and the determination of pollution characteristics to some extent. In order to promote environmental air quality improvement and Provide scientific support for local environmental management and decision-making. Methods such as statistical analysis, trend checking and correlation analysis was used to investigate the change trend of the atmospheric environment quality and Six kinds of air pollutants in different periods of Jinan after the implementation of the new ambient air quality standards and identified the characteristics of air pollution on this basis. The results show that, 1) Since 2013, the concentration of PM10 and PM2.5 keeps decreasing, SO2 and CO keep reaching the standard, and the pollution-free days in the city account for about 50% in the past three years; 2) air pollution is the most serious in winter and better in summer and autumn from the perspective of seasonal changes; 3) PM10, PM2.5 and NO2 are still exceeding the standard and O3 pollution is becoming more and more serious. It is concluded that although the environmental air quality of Jinan city is improving, but the composite air pollution characteristics represented by PM10, PM2.5 and O3 pollution have been formed.