北京第四轮PM2.5来源解析：本地排放中移动源占一半

Core Insights - The latest research on PM2.5 sources in Beijing indicates that local emissions account for 43% of the total, with mobile sources contributing 50% of local emissions [1][2] - The study, conducted by various institutions including Tsinghua University and the Chinese Academy of Sciences, highlights a shift in the relative contributions of PM2.5 sources compared to previous years [1] Group 1: PM2.5 Source Analysis - The current PM2.5 composition shows that regional sources contribute 57%, while local sources contribute 43% [1] - Among local sources, mobile sources have increased by 4% since 2020, now representing 50% of local emissions [2] - The study indicates that during heavy pollution days, regional transmission can account for up to 80% of PM2.5 levels in Beijing [1] Group 2: Seasonal and Regional Variations - Different seasons exhibit varying dominant local sources, with mobile sources leading in all seasons; spring sees significant dust emissions, while summer is marked by volatile organic compounds [2] - There are notable differences in PM2.5 source contributions across various districts in Beijing, indicating a need for tailored pollution control strategies [2] Group 3: Recommendations for Pollution Control - Experts recommend enhancing local emission reduction efforts while fostering collaboration with surrounding provinces to create a coordinated pollution control mechanism [2] - Emphasis is placed on structural emission reductions and adapting strategies to seasonal and regional pollution characteristics for more effective governance [2]