今年前三季度我国空气和水环境总体持续改善

Core Insights - The overall air quality and surface water quality in China have shown continuous improvement 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 was 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] - 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 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, PM2.5 concentration decreased by 6.3% year-on-year, with good air quality days increasing by 2.4 percentage points [1] - In the Fenwei Plain, PM2.5 concentration decreased by 16.5% year-on-year, with good air quality days increasing by 9.4 percentage points [1] Water Quality Summary - Among 3,641 national surface water monitoring sections, the proportion of sections with good water quality (Class I to III) was 89.0%, an increase of 0.5 percentage points year-on-year [1] - The proportion of sections classified as worse than Class V was 0.7%, unchanged year-on-year [1] - In major river basins, the proportion of sections with good water quality was 90.5%, an increase of 0.5 percentage points year-on-year [2] - The proportion of sections classified as worse than Class V in these basins was 0.5%, an increase of 0.1 percentage points [2] - Among 209 monitored key lakes and reservoirs, 76.6% had good water quality, while 3.8% were classified as worse than Class V [2]