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

Table 2

Descriptive statistics of daily AQI.

City	Minimum	Maximum	Mean	Standard deviation	Skewness	Kurtosis
Shijiazhuang	28	316	134.868	69.532	0.497	-0.585
Jinan	23	240	98.879	48.787	0.861	0.162
Zibo	26	290	103.461	48.178	1.293	2.282
Luoyang	35	295	110.956	53.523	1.163	1.116
Zhengzhou	30	292	122.561	63.582	0.964	0.239