“…Meanwhile, the transportation sector's energy consumption is 268.73Mt standard coal (6.98%), with 536.66Mt (6.57%) of CO 2 , 7000.87 Kt (24.54%) of NO 2 , 273.65 (15.59%) Kt of BC and 20326.41Kt (11.95%) of CO. Infrastructure investment and energy consumption will be further stimulated by the huge transportation demand (Cui and Li, 2014).Therefore, the agricultural, power, industrial, residential and transportation sectors are all expected to play an important role in the reduction of air pollutant emissions in China. In the context of complex regional atmospheric pollution along with traditional coal-based air pollution, investigation into China's baseline environmental efficiency by major socioeconomic sector and a demonstration of regions with higher environmental efficiency is of great importance for the success of nationwide persistent air pollution governance in China. Many studies are making an effort to incorporate data envelopment analysis (DEA) into the evaluation of environmental efficiency for China considering undesirable factors (see appendix Table A1) and are exploring environmental performance in different sectors, including agriculture (Lin and Fei, 2015;Lin, 2016, 2017), power generation (Zhou et al, 2013b;Bi et al, 2014;Lin and Yang, 2014;Song et al, 2017), industry (He et al, 2013;Zhou et al, 2013a;Wang and Wei, 2014;Wu et al, 2014;Bian et al, 2015;Xie et al, 2016) and transportation (Cui and Li, 2015;Liu et al, 2016;Song et al, 2016), in addition to limited research regarding the residential sector without involving China (Haas, 1997;Grösche, 2009).…”