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Environmental regulation, interregional flow of elements, and adjustment of industrial structure in urban agglomerations

: Examining the impact of environmental regulation on the adjustment of industrial structure by focusing on the mechanism of interregional flow of elements from the perspective of urban agglomerations has important theoretical and practical significance. This study constructed a com-prehensive index of environmental regulation and an index of interregional flow of elements, and made empirical tests based on the data of China ’ s top 10 representative urban agglomerations from 2003 to 2018 to analyze the mechanism of influence of environmental regulation and interregional flow of elements on the adjustment of industrial structure. The results show that: (1) Environmental regulation can significantly promote the adjustment of industrial structure in all kinds of sample groups; (2) Environmental regulation can promote the adjustment of industrial structure through the interregional flow of labor, capital, and technology for the overall sample; (3) There is heteroge-neity in the mediation effect for the subregional and regulatory level group samples: the three types of interregional flow of elements show significant mediation effect between environmental regulation and the adjustment of industrial structure for the eastern urban agglomerations and the group of medium level environmental regulation; only the interregional flow of labor shows significant mediation effect for the urban agglomerations in the central and western regions; and the mediation effects of the three types of interregional flow of elements are not significant for the high level environmental regulation group. Finally, the article put forward corresponding policy recommendations based on the conclusions in order to solve the resource and environment problems, explore the paths of optimal allocation of elements and adjustment of industrial structure of urban agglomerations, and promote the high-quality development of China ’ s urban agglomerations.