Urban Allometric Scaling in China The change of air pollution, economic and infrastructure factors and the change of the urban size (in terms of population) empirically might approximate allometric relationships: the former linearly (proportionally), superlinearly (more than proportionally) or sublinearly (less than proportionally) linked to the urban size. Based on the national census, municipal and environmental department data, we study the link between the urban population size, and air pollution, economic and infrastructure factors, founding that per capita disposable income and industrial surface are superlinearly linked with urban size, while GDP (surprisingly) and urban surface, sublinearly. The average winter temperature is inversely proportional to the concentration of PM10, NO2, CO, O3, and SO2, and the concentration of PM2.5 and PM10 is directly proportional to the road area density in the built-up area.