联合国官员：北京空气污染治理为世界提供宝贵经验

Group 1 - The air pollution control efforts in Beijing provide valuable experience for cities and countries worldwide striving for clean air [1][3] - Beijing's air quality has significantly improved over the decades, with a 2024 annual average concentration of PM2.5 at 30.5 micrograms per cubic meter, a 6.2% decrease year-on-year [3] - The proportion of days with good air quality in Beijing reached 79.2%, an increase of 19 days compared to the previous year [3] Group 2 - Continuous investment, strong policies, and a firm political will are cited as key factors behind Beijing's progress in air quality improvement [3] - The United Nations emphasizes the urgent need for collective action to address air pollution globally [3][4] - The theme for this year's International Clean Air Blue Sky Day is "Racing for Air," highlighting the importance of clean air and the need for improved air quality to protect human health [4]