久久为功，“APEC蓝”成为“北京蓝”

Core Viewpoint - The article discusses the significant improvements in air quality in Beijing, transitioning from the temporary "APEC Blue" to a more permanent "Beijing Blue" through systematic environmental governance and pollution control efforts [1][4][6]. Group 1: Environmental Governance Efforts - In 2014, President Xi Jinping emphasized the need for systematic environmental governance in major cities like Beijing, identifying air pollution as a critical issue [2][3]. - A series of targeted measures were implemented, including PM2.5 source analysis, transitioning from coal to electricity and gas, and the elimination of outdated vehicles [3][5]. - The collaboration among Beijing, Tianjin, Hebei, and surrounding cities has been formalized into a joint air pollution prevention and control mechanism, expanding from "2+26" to "2+36" cities [5]. Group 2: Achievements in Air Quality - Since 2013, the number of heavily polluted days in China has decreased by over 90%, with the average PM2.5 concentration in cities expected to reach 29.3 micrograms per cubic meter by 2024 [5][6]. - The average PM2.5 concentration in Beijing in 2024 is projected to be 30.5 micrograms per cubic meter, a 65.9% reduction from 2013 levels [8]. Group 3: Global Impact and Cooperation - China has become the fastest country in the world to improve air quality, with significant commitments to carbon peak and neutrality goals by 2030 and 2060, respectively [6][8]. - The country has signed cooperation agreements with over 40 developing nations to combat climate change and is a major supplier of wind and solar energy equipment globally [8].