Abstract
Regional integration is an important trend of economic development worldwide, which helps to break the restrictions of administrative divisions on economic development and pollution control. According to the relevant theories of environmental economic geography, regional integration will have an important impact on regional pollution control. Based on China's urban panel data, we empirically tested the impact of regional integration on regional environmental pollution and its mechanism by using econometric analysis methods, such as the difference-in-differences model and the mediating effect model. We found that regional integration can effectively reduce urban pollutant emissions and that the emission reduction effect of regional integration is characterized by significant heterogeneity at different pollution levels. The mechanism analysis showed that the green technology innovation effect of regional integration is an important mechanism for promoting urban emission reduction. The conclusions of this paper enrich the relevant theories of environmental economic geography and provide new ideas to implement integration strategies to promote sustainable economic development in developing countries.
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