“…Pollution indicators therefore include discharge volume of industrial wastewater, SO 2 emission volume, and generated volume of industrial solid waste. Based on the indicators issued by the Ministry of Environmental Protection and the experience in the literature [19,28,[40][41][42][43], this study also adopts the related control variables such as the added value of the secondary industry, population size, total import/export trade amount, urbanization rate, patent authorization, coal consumption volume, electricity consumption volume and crude oil consumption volume. With these variables, we can increase the reliability and stability of the outcomes of the regression.…”