PM2.5等排放限值，进一步“收严”！千方百计打好“蓝天保卫战”

Core Viewpoint - The Ministry of Ecology and Environment has initiated a new round of revisions to the "Ambient Air Quality Standards," tightening the emission limits for air pollutants such as PM2.5, PM10, sulfur dioxide, and nitrogen dioxide to improve air quality in China [1][4]. Group 1: Revised Standards - The annual average concentration limit for PM2.5 will be tightened from 35 micrograms per cubic meter to 25 micrograms per cubic meter [1] - The annual average concentration limit for PM10 will be reduced from 70 micrograms per cubic meter to 50 micrograms per cubic meter [1] - The annual average concentration limit for sulfur dioxide will be lowered from 60 micrograms per cubic meter to 20 micrograms per cubic meter [1] - The annual average concentration limit for nitrogen dioxide will be decreased from 40 micrograms per cubic meter to 30 micrograms per cubic meter [1] Group 2: Implementation Timeline - A transitional limit for PM2.5 will be set at 30 micrograms per cubic meter from 2026 to 2030, with full implementation of the revised limits starting in 2031 [6] Group 3: Current Air Quality Status - As of 2024, 74% of 339 cities have met the current standard of 35 micrograms per cubic meter for PM2.5, but about half of these cities still exceed the new standard of 25 micrograms per cubic meter [10] - Despite improvements, PM2.5 levels remain high, particularly in key regions affected by adverse weather conditions [10] Group 4: Health and Environmental Impact - PM2.5 is linked to major health issues such as hypertension and diabetes, making it a primary focus for the new revisions [4] - The revisions also consider the health impacts of sulfur dioxide and nitrogen oxides, which are precursors to PM2.5 [4] Group 5: Future Emission Reduction Goals - To achieve the goal of reducing the national average PM2.5 concentration to 25 micrograms per cubic meter by 2035, emissions of PM2.5, sulfur dioxide, nitrogen oxides, and volatile organic compounds need to be reduced by 23%, 21%, 28%, and 22% respectively compared to 2023 levels [14]