“…Furthermore, Fei et al [7] found an inverted U-shaped relationship between urban innovation efficiency and haze pollution, but currently, China's urban innovation efficiency has not reached a turning point. In addition, existing research has found that foreign direct investment [8], digital finance [9], manufacturing agglomeration [10], and urban density [11,12], as well as new urbanization construction [13], digital development, environmental regulation, technological innovation, and an advanced industrial structure are all beneficial for improving haze pollution [14,15]. Some scholars also believe that investing in environmentally friendly transportation infrastructure, levying reasonable environmental taxes, establishing an environmental negotiation system with the Ministry of Ecology and Environment, and expanding local government environmental expenditure can also promote the governance of haze pollution [16][17][18].…”