低碳城市的CO2与PM2.5减排协同效应分析

将基于卫星遥感数据的CO₂与PM_2.5纳入统一研究框架,运用多期双重差分等方法,在城市尺度上分析评估2007～2019年中国低碳城市政策对CO₂减排与PM_2.5污染控制的协同效应及其影响机制.研究发现:低碳城市CO₂与PM_2.5减排的协同效应十分显著,低碳政策使试点城市的CO₂排放量和大气PM_2.5浓度分别下降3.2%和0.74%,且结论在一系列稳健性检验后依然成立.机制分析表明,改善公共交通环境是低碳城市建设实现协同效应的最主要途径.低碳城市政策的协同效应存在地区差异,经济发展水平高、产业结构水平高的城市以及非资源型城市的协同效应更为显著.对此,应充分发挥协同效应,进一步加快低碳城市建设,实现CO₂和PM_2.5等大气污染物协同治理.

Assessment for Co-benefits of low-carbon city on CO2 and PM2.5 in China

This paper incorporated CO₂ and PM_2.5 that based on satellite remote sensing data into a unified research framework. The time-varying difference-in-differences model was used to explore the Co-benefits and impact mechanism of low-carbon city construction from 2007 to 2019 at the city scale. It was found that the Co-benefits of CO₂ and PM_2.5 were significant, which reducing CO₂ emissions and atmospheric PM_2.5 concentrations in pilot cities by 3.2% and 0.74%. The findings still held after a series of robustness tests. The mechanism analysis showed that improving the public transportation environment was the most important way to achieve the Co-benefits in low-carbon city construction. Moreover, there were regional differences in the Co-benefits of low carbon policies, and the Co-benefits were more significant in cities with high levels of economic development, high levels of industrial structure, and non-resource-based cities. Therefore, we should give full play to the Co-benefits and further accelerate the construction of low-carbon cities to promote the synergistic management of CO₂, PM_2.5 and other air pollutants.