上半年中国地级及以上城市平均空气质量优良天数比例为83.8%

Core Insights - The overall air quality in China has improved in the first half of the year, with an average of 83.8% of days classified as good air quality across 339 cities [1][3] Air Quality Data - The average concentration of PM2.5 in 339 cities is 32.1 micrograms per cubic meter, a year-on-year decrease of 2.4% [3] - The average concentration of PM10 remains stable at 55 micrograms per cubic meter [3] - In the Beijing-Tianjin-Hebei region, the average PM2.5 concentration is 40.8 micrograms per cubic meter, showing a significant year-on-year decline of 15.4% [3] - Beijing's PM2.5 concentration is reported at 28.5 micrograms per cubic meter, down 17.4% year-on-year [3] Pollution Statistics - The proportion of days with good air quality increased by 1.0 percentage point compared to the previous year [3] - The percentage of days with heavy pollution or worse remains unchanged at 1.5% [3] - Days exceeding air quality standards due to dust storms account for 4.2%, with heavy pollution days making up 1.0% of this total [3] Top Performing Cities - The top 20 cities with the best air quality include Lhasa, Haikou, Zhangjiakou, and others, indicating regional variations in air quality performance [3]