China's provincial total-factor air pollution emission efficiency evaluation, dynamic evolution and influencing factors

In recent years, air pollution situation becomes more severe and has seriously threatened sustainable economic development and public health in China. Combining the improved slacks-based measure (SBM) model, global Malmquist-Luenberger (GML) productivity index and panel Tobit model, this paper investigates the regional differences, dynamic evolution and influencing factors of China's provincial air pollution emission efficiency over the period 2006-2015 under the total-factor framework. Our results show that: (1) China's total-factor air pollution emission efficiency is relatively low and exhibits significant regional differences; (2) technological progress is the main contributor to ameliorate China's provincial total-factor air pollution emission efficiency; (3) the total-factor air pollution emission efficiency gap between the higher- and the lower-efficient provinces will probably widen in the future; (4) China's provincial total-factor air pollution emission efficiency is significantly positive related to the level of economic development, industrial structure optimization, technological innovation and foreign direct investment (FDI), is significantly negative related to the energy consumption structure. The above results indicate that China has made remarkable achievements in improving regional total-factor air pollution emission efficiency. However, there is considerable potential for further improvement. Policy options for China's regional total-factor air pollution emission efficiency improvement include but not limited to optimizing industrial and energy consumption structure, promoting environmental technology innovation, strengthening cooperation and exchange between different regions, deepening the reform of energy market and energy pricing mechanism, actively introducing foreign investment, and further improving environmental regulation level.