区域环境协同治理行动奏效了吗？——基于多时点双重差分法的环境治理效果评估

效果检验和评价是区域环境协同治理的关键问题。基于2013—2018年的空气质量指数和细颗粒物、可吸入颗粒物、二氧化硫、一氧化碳、二氧化氮、臭氧等6种分项污染物的月报数据，以首批实施新环境空气质量标准的73个城市为研究对象，评估区域协同治理的实施效果。研究结果表明：区域环境协同治理效果在不同区域和不同环境指标上呈现差异性；协同治理在全国层面并未有效改善综合性的空气质量，但降低了二氧化硫浓度；协同治理对京津冀区域综合性的空气质量改善和二氧化硫降低都达到了预期效果；协同治理显著降低了长三角区域的可吸入颗粒物、二氧化硫、一氧化碳等3种污染物浓度。由此提出改进我国环境治理政策的有益建议。

Has the Regional Environmental Coordinated Governance Action Been Effective? 〖JP3〗Evaluation of Environmental Governance Effects Based on Multi-period Difference-in-Differences Method

Effectiveness testing and evaluation are crucial issues in regional environmental coordinated governance. Based on the air quality index and monthly data of six sub-pollutants, including fine particulate matter (PM), respirable particulate matter (RPM), sulfur dioxide (SO2), carbon monoxide (CO), nitrogen dioxide (NO2), and ozone (O3), from 2013 to 2018, this paper evaluates the implementation effectiveness of regional coordinated governance with the first batch of 73 cities implementing the new environmental air quality standards as the research subjects. The results show that the effectiveness of regional environmental coordinated governance varies across different regions and environmental indicators. The coordinated governance does not effectively improve the overall air quality at the national level, but reduces sulfur dioxide concentration. The coordinated governance achieves the expected effects of improving the comprehensive air quality and reducing sulfur dioxide in the Beijing-Tianjin-Hebei region. Additionally, it significantly reduced the concentrations of inhalable particulate matter, sulfur dioxide, and carbon monoxide in the Yangtze River Delta region. Based on these findings, beneficial suggestions for improving China’s environmental governance policies are proposed.