2025年中国天更蓝水更清

Air Quality Improvement - The average PM2.5 concentration in 339 cities is 28.0 micrograms per cubic meter, a year-on-year decrease of 4.4% [2] - The average PM10 concentration is 48 micrograms per cubic meter, a year-on-year decrease of 2.0% [2] - The proportion of days with good air quality is 89.3%, an increase of 1.9 percentage points year-on-year [2] - The proportion of days with heavy pollution remains stable at 0.9% [2] Regional Air Quality - In the Beijing-Tianjin-Hebei region, the average PM2.5 concentration is 37.3 micrograms per cubic meter, a year-on-year decrease of 11.6% [2] - The proportion of good air quality days in this region is 73.8%, an increase of 5.5 percentage points year-on-year [2] - In the Yangtze River Delta, the average PM2.5 concentration is 31.7 micrograms per cubic meter, a year-on-year decrease of 3.9% [2] - The proportion of good air quality days in this region is 82.7%, an increase of 0.6 percentage points year-on-year [2] - In the Fenwei Plain, the average PM2.5 concentration is 33.7 micrograms per cubic meter, a year-on-year decrease of 14.9% [2] - The proportion of good air quality days in this region is 77.5%, an increase of 7.0 percentage points year-on-year [2] Surface Water Quality Improvement - Among 3641 national surface water monitoring sections, the proportion of sections with good water quality (Class I-III) is 91.4%, an increase of 1.0 percentage points year-on-year [3] - In major river basins, the proportion of good water quality sections is 93.0%, an increase of 0.6 percentage points year-on-year [3] - Among 209 monitored key lakes and reservoirs, the proportion of those with good water quality (Class I-III) is 78.5%, an increase of 1.4 percentage points year-on-year [3]