生态环境部：前三季度全国环境质量持续改善

Core Insights - The Ministry of Ecology and Environment reported continuous improvement in air and surface water quality in China during the first three quarters of the year [1][2] Air Quality Summary - The average PM2.5 concentration in 339 cities was 26 micrograms per cubic meter, a year-on-year decrease of 5.1% [1] - The average PM10 concentration was 45 micrograms per cubic meter, down 4.3% year-on-year [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 was 1.1%, unchanged from the previous year [1] - In the Beijing-Tianjin-Hebei region, the average PM2.5 concentration was 33 micrograms per cubic meter, a decrease of 15.6% year-on-year [1] - The proportion of good air quality days in this region was 73.5%, up 8.5 percentage points year-on-year [1] - The Yangtze River Delta region reported an average PM2.5 concentration of 29.6 micrograms per cubic meter, down 6.3% year-on-year [1] Surface Water Quality Summary - Among 3,641 national surface water monitoring sections, 89% were rated as good quality (Class I-III), an increase of 0.5 percentage points year-on-year [2] - The proportion of poor quality (Class V) sections was 0.7%, unchanged from the previous year [2] - In major river basins, 90.5% of monitoring sections were rated as good quality, an increase of 0.5 percentage points year-on-year [2] - The proportion of poor quality sections in these basins was 0.5%, up 0.1 percentage points year-on-year [2] - Among 209 key lakes and reservoirs monitored, 76.6% were rated as good quality, a decrease of 2.0 percentage points year-on-year [2] - The proportion of poor quality lakes and reservoirs was 3.8%, down 0.5 percentage points year-on-year [2]