10月中国地级及以上城市PM2.5平均浓度同比下降17.5%

Group 1 - The average PM2.5 concentration in 339 cities in China decreased by 17.5% year-on-year in October, reaching 23.5 micrograms per cubic meter [1] - The proportion of days with good air quality increased by 3.9 percentage points year-on-year, reaching 96.2% in October [1] - The average PM10 concentration in the same cities was 39 micrograms per cubic meter, down 18.8% year-on-year [1] Group 2 - In the Beijing-Tianjin-Hebei region, the average PM2.5 concentration was 34.7 micrograms per cubic meter, a decrease of 37.1% year-on-year, with Beijing's concentration at 31.7 micrograms per cubic meter, down 24.9% [1] - The average PM2.5 concentration in the Fenwei Plain's 13 cities was 28.9 micrograms per cubic meter, a decline of 33.7% year-on-year [1] - Among 168 key cities, the cities with the best air quality included Guiyang, Kunming, and Haikou, while cities with the worst air quality included Baoding, Shijiazhuang, and Urumqi [2]