The spatial differences of the synergy between CO₂ and air pollutant emissions in China's 296 cities

The emissions reduction of CO₂ and air pollutants are the main task in China. The two have the same roots and they interact with each other. However, CO₂ and air pollutants are quite different in space, so it is of great practical significance to explore the spatial differences of their synergy. As PM_2.5 and O₃ are more concerned at present, thus, this paper examined the decoupling of CO₂, PM_2.5 and O₃ from GDP in China's 296 cities using the latest available data from 2015 to 2016. And the spatial differences of synergy among CO₂, PM_2.5 and O₃ were quantitatively analyzed by using spatial autocorrelation analysis and geographically weighted regression model. The results showed that: (1) The cities achieving the three synergy emissions reduction were mainly in the southeast of China. (2) Only 26 cities had achieved the strong decoupling of CO₂, PM_2.5 and O₃ from GDP. (3) The synergy characteristics between CO₂ and PM_2.5, CO₂ and O₃ were different. This paper put forward the policies according to the conclusions.