[Relationship Between Urban Industrialization and PM 2.5 Concentration in China and the Internal Mechanism of EKC].

Based on the panel data of 255 cities in China, this study built a spatial Durbin model to study the impact of China's industrialization on the PM _2.5 pollution level. Meanwhile, an environmental governance tool characterized by forest and grass coverage was introduced to explore the internal mechanism and exogenous driving force of EKC. The results show that ① the relationship between industrialization and PM _2.5 concentration is obviously an inverted u-shaped, and the EKC hypothesis was verified. ② The formation of the EKC curve was caused by the external factors and not the endogenous mechanism of economic growth. Forest-grass coverage plays a regulating role in the relationship between industrialization and PM _2.5 pollution level, namely the inverted u-shaped structure of environmental EKC results from environmental governance tool with forest and grass cover rather than the automatic adjustment of economic growth. ③ The influence of industrialization on PM _2.5 concentration has a spatial spillover effect. Urban industrialization not only affects the PM _2.5 concentration in local regions but also its neighboring region.