关键词: 公共交通, 碳排放效率, 超效率 ＳＢＭ模型, ＭＬ指数

Abstract: This paper takes Nanjing’s public transport system as the research object and uses the bottom-up carbon emission measurement method to calculate the carbon emissions of Nanjing’s public transport, rail transit and taxi during 2010—2020. The SBM model of unexpected output super efficiency was established to measure the carbon emission efficiency of three types of transportation modes, and the dynamic change of total factor productivity was analyzed by ML index. The results show that the carbon emission efficiency index of rail transit is the best, followed by bus and taxi. However, the carbon emission efficiency of rail transit shows a declining trend, so the technical efficiency of rail transit needs to be further improved. On the contrary, improving its operating efficiency is the goal of bus development in the future. Since the carbon emission efficiency of taxi is low, not only the operation efficiency should be improved, but also the technological investment should be increased. Finally, this paper puts forward some suggestions to improve the carbon emission efficiency of Nanjing public transport system, which has practical significance for urban public transport to achieve carbon peak and carbon neutrality.