我国空气质量标准“升级”

Core Points - The Ministry of Ecology and Environment has released a draft for the revision of the "Ambient Air Quality Standards" and related technical specifications, focusing on tightening the concentration limits for PM2.5, PM10, sulfur dioxide, and nitrogen dioxide [1][2] - The revised standards propose to lower the secondary limits for PM2.5 from 35 and 75 micrograms per cubic meter to 25 and 50 micrograms per cubic meter, and for PM10 from 70 and 150 micrograms per cubic meter to 50 and 100 micrograms per cubic meter [1] - The implementation of the revised standards will occur in two phases: the first phase from 2026 to 2030 with transitional limits, and the second phase starting in 2031 with full enforcement of the new limits [1] Summary by Sections Revision Details - The draft proposes stricter limits for PM2.5 and PM10, as well as for sulfur dioxide and nitrogen dioxide, to enhance public health protection [1] - The new PM2.5 annual and daily secondary limits will be 30 and 60 micrograms per cubic meter during the transitional phase [1] Impact on Air Quality Assessment - The revision may lead to changes in air quality evaluation results for certain cities and regions, potentially shifting from compliant to non-compliant status under the new standards [2] - This change does not indicate a deterioration in air quality but reflects a commitment to improving air quality under higher standards [2]