7月空气质量状况公布 全国PM2.5浓度大幅下降

Core Insights - The average PM2.5 concentration in 339 cities in July was 14.5 micrograms per cubic meter, representing an 8.2% year-on-year decrease [1] - The average PM10 concentration was 28 micrograms per cubic meter, down 3.4% year-on-year [1] - The proportion of days with good air quality was 93.0%, an increase of 1.0 percentage points year-on-year [1] - The proportion of days with heavy pollution or worse was 0.2%, a decrease of 0.1 percentage points year-on-year [1] Regional Analysis - In the Beijing-Tianjin-Hebei region, the average PM2.5 concentration was 18.3 micrograms per cubic meter, down 21.1% year-on-year, with no days of heavy pollution reported [1] - The PM2.5 concentration in Beijing specifically was 18.3 micrograms per cubic meter, reflecting a 31.2% year-on-year decrease [1] - In the Yangtze River Delta region, the average PM2.5 concentration was 14.6 micrograms per cubic meter, down 3.9% year-on-year, with no days of heavy pollution [1] - In the Fenwei Plain region, the average PM2.5 concentration was 18.5 micrograms per cubic meter, down 20.6% year-on-year, with an 82.1% good air quality day ratio, up 14.1 percentage points year-on-year [1] City Rankings - Among 168 key cities, the top 20 cities with the best air quality included Huangshan, Haikou, Lishui, and Fuzhou [2] - The bottom 20 cities with the poorest air quality included Yangquan, Jiaozuo, and Luliang [2]