我国生态环境质量总体持续改善

Group 1: Air Quality Improvement - The average proportion of days with good air quality in 339 cities was 84.8%, an increase of 1.2 percentage points year-on-year [1] - The average concentration of PM2.5 was 41.3 micrograms per cubic meter, a decrease of 4.8% year-on-year [1] - The average concentration of PM10 was 65 micrograms per cubic meter, a decrease of 3.0% year-on-year [1] Group 2: Regional Air Quality Data - In the Beijing-Tianjin-Hebei region, the average PM2.5 concentration was 51.4 micrograms per cubic meter, a decrease of 19.9% year-on-year [2] - The average proportion of good air quality days in this region was 74.0%, an increase of 5.5 percentage points year-on-year [2] - In the Yangtze River Delta, the average PM2.5 concentration was 48.2 micrograms per cubic meter, a decrease of 9.4% year-on-year [2] Group 3: Surface Water Quality Improvement - The proportion of good water quality (Class I-III) in 3641 national monitoring sections was 91.0%, an increase of 1.1 percentage points year-on-year [3] - In major river basins, the proportion of good water quality sections was 92.1%, an increase of 0.6 percentage points year-on-year [3] - Among 196 monitored key lakes, the proportion of good water quality lakes was 82.1%, remaining stable year-on-year [3]