MEASUREMENT OF REGIONAL ENVIRONMENTAL EFFICIENCY IN CHINA BASED ON THE SUPER-EFFICIENCY SBM MODEL

This paper measures the regional environmental efficiency in China by using the superefficiency slacks-based measure (SBM). It calculates the environmental efficiency in the presence and absence of the environmental pollution variable respectively, and compares the calculation results of the super-efficiency SBM model with the Banker & Charnes & Cooper’s (BCC) model, one of the traditional data envelopment analysis (DEA) models. By analyzing the environmental efficiencies in all provinces, it analyzes the slack variables to determine in which direction each region should improve. The results show that the addition of the environmental pollution variable has resulted in significant declines in the efficiencies of provinces with DEA inefficiencies. Among the four regions, the eastern one has the highest environmental efficiency, the western region comes next and the northeastern and central regions are the last ones. There are also some economically developed provinces with low environmental efficiency, and different inefficient provinces need to be improved in different directions.