Air pollution, especially fine particulate matter (PM2.5) pollution, has a great negative impact on human pro-duction and normal life. It is a hot issue of global concern, and it is also a huge test for China ' s high-quality socioeconomic development. Environmental absorption capacity (EAC) is the guarantee of the structure and function of a healthy atmospheric environmental system. It plays an important role in the automatic accommo-dation, absorption, and digestion of air pollutants produced by humans in the process of industrialization and civilization. Understanding the absorption capacity of environmental elements on PM2.5, and exploring the im-pact of EAC on PM2.5 concentration are of great significance to the development of new ideas for air pollution control. This paper constructed an index system to calculate the EAC index from two dimensions (natural re-source endowment and impact of human activities), analyzed and discussed the impact of EAC on PM2.5 con-centration and its heterogeneity effect through panel regression model, generalized panel quantile regression based on MCMC optimization and scenario analysis, by using the panel data of 30 provinces in China from 2004 to 2017. The results suggested that:(ⅰ) The overall level of national EAC was low, and the regional differ-ences were large. EAC was influenced by natural resource endowment and human activities, while natural en-dowment was the main factor affecting EAC, and human activities were the main factor causing the fluctua-tion and the regional difference of EAC. (ii) As the result of full sample regression demonstrated, the enhance-ment of EAC had a significant negative influence on the reduction of PM2.5 concentration. In areas with high PM2.5 concentration, the effect of EAC was more obvious, but the effect did not necessarily increase with the increase of PM2.5 concentration. Also, in extreme cases, the effect did not pass the significance test. (ⅲ) Ac-cording to the results of heterogeneity effect analysis, the effect of EAC on PM2.5 concentration was signifi-cantly negative in sustainable scenario and emergency scenario, while the effect was not significant in Soylent Green scenario. The conclusion provides important implications for the prevention and control of air pollution and the improvement of atmospheric environmental quality.

Lin Li;Jinhua Cheng;Beidi Diao

School of Economics and Management,China University of Geosciences(Wuhan),Wuhan,430074,China;Center of Resource and Environmental Economics,China University of Geosciences(Wuhan),Wuhan,430074,China;School of Economics and Management,China University of Mining and Technology,Xuzhou,221116,China

中国人口·资源与环境（英文版）

[1]Lin Li;Jinhua Cheng;Beidi Diao-.Impact of environmental absorption capacity on PM2.5 concentration in China)[J].中国人口·资源与环境（英文版）,2022(02):190-198

dowment,fluctua,Soylent

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