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1—6月全国339个地级及以上城市平均空气质量优良天数比例为83.8%
Yang Shi Wang·2025-07-28 03:20

Air Quality Overview - In June, the average PM2.5 concentration across 339 cities was 16.3 µg/m³, a year-on-year decrease of 4.7% [2] - The average PM10 concentration was 33 µg/m³, down 5.7% year-on-year [2] - The average O3 concentration was 153 µg/m³, an increase of 0.7% year-on-year [2] - The proportion of days with good air quality was 84.0%, up 5.7 percentage points year-on-year [2] - The proportion of days with heavy pollution was 0.2%, unchanged year-on-year [2] Year-to-Date Air Quality - From January to June, the average PM2.5 concentration was 32.1 µg/m³, a decrease of 2.4% year-on-year [2] - The average PM10 concentration remained stable at 55 µg/m³ [2] - The average NO2 concentration was 20 µg/m³, down 4.8% year-on-year [2] - The average CO concentration was 1.0 mg/m³, a decrease of 9.1% year-on-year [2][3] Key Regions Analysis Beijing-Tianjin-Hebei Region - In June, the average PM2.5 concentration was 24.2 µg/m³, down 11.7% year-on-year [7] - The average O3 concentration was 213 µg/m³, a decrease of 3.6% year-on-year [7] - The proportion of good air quality days was 46.5%, an increase of 26.9 percentage points year-on-year [7] Yangtze River Delta Region - In June, the average PM2.5 concentration was 18.1 µg/m³, down 10.8% year-on-year [9] - The average O3 concentration was 176 µg/m³, a decrease of 11.6% year-on-year [9] - The proportion of good air quality days was 76.0%, an increase of 15.7 percentage points year-on-year [9] Fenwei Plain - In June, the average PM2.5 concentration was 20.4 µg/m³, down 17.4% year-on-year [11] - The average O3 concentration was 197 µg/m³, a decrease of 3.9% year-on-year [11] - The proportion of good air quality days was 49.2%, an increase of 15.3 percentage points year-on-year [11] Key Cities Performance - Among 168 key cities, the top 20 cities with the best air quality included Lhasa, Haikou, and Zhangjiakou [12] - The bottom 20 cities with the poorest air quality included Xianyang, Xi'an, and Kaifeng [12] - The cities with the most significant improvement in air quality included Xinzhou, Hohhot, and Baotou [12][13]