今年前三季度我国生态环境质量总体持续改善

Core Points - The overall air quality and surface water quality in China have improved in the first three quarters of this year [1] Air Quality Summary - The average PM2.5 concentration in 339 cities was 26.0 micrograms per cubic meter, a year-on-year decrease of 5.1% [1] - The average PM10 concentration was 45 micrograms per cubic meter, a year-on-year decrease of 4.3% [1] - The proportion of days with good air quality averaged 87.6%, an increase of 1.8 percentage points year-on-year [1] - The proportion of days with heavy pollution or worse was 1.1%, unchanged year-on-year [1] Key Regions - In the Beijing-Tianjin-Hebei region, the average PM2.5 concentration was 33.0 micrograms per cubic meter, a year-on-year decrease of 15.6% [1] - The average proportion of good air quality days in this region was 73.5%, an increase of 8.5 percentage points year-on-year [1] - In the Yangtze River Delta, the average PM2.5 concentration was 29.6 micrograms per cubic meter, a year-on-year decrease of 6.3% [1] - The average proportion of good air quality days in this region was 81.6%, an increase of 2.4 percentage points year-on-year [1] - In the Fenwei Plain, the average PM2.5 concentration was 30.9 micrograms per cubic meter, a year-on-year decrease of 16.5% [1] - The average proportion of good air quality days in this region was 75.3%, an increase of 9.4 percentage points year-on-year [1] Surface Water Quality Summary - Among 3,641 national surface water monitoring sections, the proportion of sections with good water quality (Class I-III) was 89.0%, an increase of 0.5 percentage points year-on-year [1] - The proportion of sections classified as poor (Class V or worse) was 0.7%, unchanged year-on-year [1]