27微克/立方米，去年北京PM2.5年均浓度首次“破30”

Core Viewpoint - In 2025, Beijing achieved significant improvements in air quality, with PM2.5 annual average concentration dropping below 30 micrograms per cubic meter for the first time, marking a milestone in air pollution control efforts [1] Group 1: Air Quality Improvements - The annual average concentration of PM2.5 in Beijing reached 27 micrograms per cubic meter, a year-on-year decrease of 11.5% [1] - The proportion of days with good air quality exceeded 80%, reaching 85.2% [1] - Other major pollutants also showed improvement, with PM10, NO2, and O3 concentrations at 48 micrograms per cubic meter, 22 micrograms per cubic meter, and 159 micrograms per cubic meter, respectively, reflecting year-on-year declines of 11%, 8.3%, and 7.0% [1] Group 2: Compliance with Standards - All six monitored pollutants met national standards, indicating comprehensive compliance with air quality regulations [1] - SO2 and CO concentrations remained at very low levels of 4 micrograms per cubic meter and 0.9 milligrams per cubic meter, respectively [1]