Temporal and spatial correlation patterns of air pollutants in Chinese cities
Fig 5
Hurst exponent distribution of the six pollutants for the 350 observed cities in 2015.
From (a) to (f) are PM2.5, PM10, CO, NO2, O3 and SO2 respectively. The left panel for each subfigure are the Hurst exponents projected into the China maps, in which the the filled circles in different colors (red, blue, green, orange, yellow, brown and pink) are 7 equal Hurst intervals ranging from 0.3 to 1. The right panel for each subfigure are the histograms of the exponents.