生态环境部：7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93%

Core Insights - The Ministry of Ecology and Environment reported that in July 2025, the average proportion of days with good air quality across 339 cities was 93.0%, an increase of 1.0 percentage points year-on-year [1] - The proportion of days with heavy pollution or worse was 0.2%, a decrease of 0.1 percentage points compared to the previous year [1] - The average number of days exceeding air quality standards due to sandstorms was 0.6%, with heavy pollution days accounting for 0.2% of this total [1]