北京去年全年重污染日仅1天，PM2.5年均浓度首次“破30”

Core Insights - Beijing achieved a significant reduction in air pollution, with only one heavy pollution day recorded in the previous year, marking the lowest since monitoring began [1] - The annual average concentration of PM2.5 in Beijing is projected to drop below 30 micrograms per cubic meter for the first time, reaching 27.0 micrograms per cubic meter by 2025 [1] - The proportion of days with good air quality in Beijing exceeded 80% for the first time, reaching 85.2% [1] PM2.5 Improvement - By 2025, the number of days classified as having good PM2.5 levels is expected to reach 348, an increase of 144 days compared to 2013, which translates to nearly five additional months of improved air quality [1] - The PM2.5 good air quality ratio improved from 55.9% in 2013 to 95.3% by 2025 [1] Long-term Trends - From March to October 2025, PM2.5 levels are anticipated to remain at good quality for 227 consecutive days, significantly surpassing the 13 days recorded in 2013, representing the longest period of good air quality since monitoring began [1]