生态环境部公布2025年10月全国环境空气质量状况

Core Insights - The Ministry of Ecology and Environment released the national air quality status for October 2025, indicating significant improvements in air quality across various regions of China [1]. Overall Situation - In October, the average PM2.5 concentration across 339 cities was 23.5 micrograms per cubic meter, a year-on-year decrease of 17.5% [2]. - The average PM10 concentration was 39 micrograms per cubic meter, down 18.8% year-on-year [2]. - Ozone (O3) levels averaged 103 micrograms per cubic meter, a decrease of 16.9% [2]. - Sulfur dioxide (SO2) averaged 7 micrograms per cubic meter, down 12.5% [2]. - Nitrogen dioxide (NO2) averaged 18 micrograms per cubic meter, a decrease of 18.2% [2]. - Carbon monoxide (CO) averaged 0.8 milligrams per cubic meter, remaining stable year-on-year [2]. - The proportion of days with good air quality was 96.2%, an increase of 3.9 percentage points year-on-year [2]. - The proportion of days with heavy pollution was 0.3%, an increase of 0.1 percentage points year-on-year [2]. - Days exceeding standards due to dust storms accounted for 0.9%, with heavy pollution days at 0.1% [2]. Key Regions Beijing-Tianjin-Hebei and Surrounding Areas - The average PM2.5 concentration was 34.7 micrograms per cubic meter, a decrease of 37.1% year-on-year [6]. - Ozone levels averaged 104 micrograms per cubic meter, down 30.7% [6]. - The proportion of good air quality days was 88.8%, an increase of 19.0 percentage points [6]. - Heavy pollution days were at 0.8%, a decrease of 0.6 percentage points [6]. - No days of exceeding standards due to dust storms were reported [6]. Yangtze River Delta - The average PM2.5 concentration was 23.2 micrograms per cubic meter, a decrease of 16.2% year-on-year [7]. - Ozone levels averaged 124 micrograms per cubic meter, down 10.8% [7]. - The proportion of good air quality days was 96.7%, an increase of 3.8 percentage points [7]. - No heavy pollution days were reported [7]. Fenwei Plain - The average PM2.5 concentration was 28.9 micrograms per cubic meter, a decrease of 33.7% year-on-year [8]. - Ozone levels averaged 91 micrograms per cubic meter, down 34.1% [8]. - The proportion of good air quality days was 96.5%, an increase of 8.4 percentage points [8]. - No heavy pollution days were reported [8]. Key Cities - Among 168 key cities, the top 20 cities with the best air quality included Guiyang, Kunming, and Suining [10]. - The bottom 20 cities with the worst air quality included Baoding, Shijiazhuang, and Zhuzhou [10]. - The top 20 cities with the lowest PM2.5 concentrations included Lhasa, Zhoushan, and Suining [10]. - The bottom 20 cities with the highest PM2.5 concentrations included Baoding, Handan, and Zhuzhou [10].