今年上半年我国生态环境质量总体持续改善

Air Quality Summary - In the first half of the year, the average proportion of days with good air quality in 339 cities was 83.8%, an increase of 1.0 percentage points year-on-year [1] - The average PM2.5 concentration nationwide was 32.1 micrograms per cubic meter, a decrease of 2.4% year-on-year [1] - The average PM10 concentration remained stable at 55 micrograms per cubic meter year-on-year [1] Regional Air Quality - In the Beijing-Tianjin-Hebei region, the average PM2.5 concentration was 40.8 micrograms per cubic meter, down 15.4% year-on-year, with a good air quality day proportion of 67.6%, up 9.9 percentage points [1] - In the Yangtze River Delta, the average PM2.5 concentration was 37.4 micrograms per cubic meter, a decrease of 4.3% year-on-year, with a good air quality day proportion of 76.9%, up 1.6 percentage points [1] - In the Fenwei Plain, the average PM2.5 concentration was 38.3 micrograms per cubic meter, down 13.7% year-on-year, with a good air quality day proportion of 68.4%, up 7.1 percentage points [1] Surface Water Quality Summary - Among 3641 national surface water monitoring sections, the proportion of sections with good water quality (Class I-III) was 89.0%, an increase of 0.2 percentage points year-on-year [2] - The proportion of sections with poor water quality (Class V) was 1.0%, an increase of 0.2 percentage points year-on-year [2] - In major river basins, the proportion of sections with good water quality was 90.4%, an increase of 0.1 percentage points year-on-year [2] Lake Water Quality - Among 209 monitored key lakes and reservoirs, the proportion of those with good water quality (Class I-III) was 78.0%, a decrease of 1.5 percentage points year-on-year [2] - The proportion of lakes and reservoirs with poor water quality (Class V) was 3.8%, a decrease of 0.5 percentage points year-on-year [2]