Backward Trajectory and Multifractal Analysis of Air Pollution in Zhengzhou Region of China

Figure 2

Daily Air Quality Index (AQI) from 1 December 2019 to 29 February 2020. SJZ, JN, ZB, LY, and ZZ refer to five cities, Shijiazhuang, Jinan, Zibo, Luoyang, and Zhengzhou, in China, respectively.