北京重污染日基本消除

Core Viewpoint - Beijing aims to achieve significant improvements in air quality by 2025, with PM2.5 annual average concentration reaching 27.0 micrograms per cubic meter, marking a breakthrough below 30 [1] Group 1: Air Quality Improvement Goals - By 2025, the proportion of days with good air quality in Beijing is expected to exceed 80% for the first time [1] - Heavy pollution days are projected to be virtually eliminated [1] Group 2: Historical PM2.5 Trends - Since the initiation of air pollution control measures, Beijing has seen a long-term improvement in PM2.5 levels, decreasing from 89.5 micrograms per cubic meter in 2013 to 27.0 micrograms per cubic meter by 2025, a reduction of 69.8% [1] - During the 14th Five-Year Plan period, Beijing's PM2.5 annual average concentration has consistently met national standards and set new lows, achieving compliance for five consecutive years [1] - After first meeting national standards in 2021, the PM2.5 level is expected to decrease by an additional 30% by 2025 compared to 2020 levels [1]