The Impact of the “Air Pollution Prevention and Control Action Plan” on PM 2.5 Concentration in China During 2014–2019

In this study, ChinaHighPM2.5 data sets were used for trend analysis of PM2.5 concentration in China and its five typical regions after the issue of “Air Pollution Prevention and Control Action Plan”. The result shows that the average PM2.5 in the five selected regions from 2014 to 2019 was higher than that of China. China's PM2.5 showed a significant downward trend from 2014 to 2019, with a year on year growth rate of -43.57%. Beijing-Tianjin-Hebei and Chengdu-Chongqing City Group had the most significant decline in PM2.5 concentration, with that of -46.63% and - 53.05% respectively, both higher than the national average. Except for Taklimakan Desert Region, the PM2.5 in other regions showed a clear downward trend and was significant negatively correlated with the year. In addition, the regional difference in PM2.5 concentration decreased with the year, as well as concentration interval.