空气质量标准收紧，从“达标”变“不达标”，这66城该咋办

Core Viewpoint - The Ministry of Ecology and Environment announced the revision of the Ambient Air Quality Standards, marking the second revision since 2012, with new standards to be implemented on March 1, 2023, which will tighten air quality evaluation criteria [1]. Group 1: Impact of New Standards - The revised standards will affect air quality evaluation results, potentially causing cities that previously met standards to fall below them, and days previously classified as good may now be considered lightly polluted [1]. - By 2025, if evaluated under the transitional limit of 30 µg/m³ for PM2.5, the number of cities meeting the standard will decrease from 271 to 205, and the proportion of good air quality days will drop from 88.1% to 83.6% [1]. - Under the second phase limit of 25 µg/m³ for PM2.5, the number of compliant cities will further decline to 140, with good air quality days falling to 78.3% [1]. Group 2: Differentiated Strategies for Cities - The Ministry will implement differentiated strategies based on the concentration levels of PM2.5 in different cities, focusing on structural, engineering, and management reductions to address pollution issues [2]. - Cities with PM2.5 levels above 35 µg/m³, accounting for about 20%, will need to continue efforts to reduce emissions, while those between 26-35 µg/m³, making up about 40%, must utilize the transition period to analyze pollution causes and enhance reduction efforts [2]. Group 3: Goals and Support Mechanisms - The Ministry plans to set specific air quality improvement targets for each city based on their pollution levels and reduction potential, emphasizing the importance of local efforts in improving air quality [3]. - Support will be directed towards cities with higher PM2.5 concentrations and strong improvement intentions, focusing on funding, technical support, and capacity building [3]. - Cities will be encouraged to develop tailored strategies for air quality improvement, implementing measures to ensure sustained progress and enhance public satisfaction with air quality [3].