7月中国地级及以上城市平均空气质量优良天数比例为93%

Group 1 - The average proportion of days with good air quality in China's cities at the prefecture level and above was 93.0% in July, an increase of 1.0 percentage points year-on-year [1] - The average concentration of PM2.5 in July was 14.5 micrograms per cubic meter, a decrease of 8.2% year-on-year, while the average concentration of PM10 was 28 micrograms per cubic meter, down 3.4% 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] Group 2 - In the Beijing-Tianjin-Hebei region and surrounding areas, the average PM2.5 concentration was 18.3 micrograms per cubic meter, a decrease of 21.1% year-on-year, with an average good air quality days proportion of 75.7%, down 4.6 percentage points year-on-year [1] - The PM2.5 concentration in Beijing was 18.3 micrograms per cubic meter, a decrease of 31.2% year-on-year [1] - In the Fenwei Plain, the average PM2.5 concentration was 18.5 micrograms per cubic meter, a decrease of 20.6% year-on-year, with an average good air quality days proportion of 82.1%, an increase of 14.1 percentage points year-on-year [1] Group 3 - 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 worst air quality included Yangquan, Jiaozuo, and Luliang [2]