2025年我国环境空气质量和地表水环境质量持续改善

Group 1: 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% [1] - The average PM10 concentration is 48 micrograms per cubic meter, a year-on-year decrease of 2.0% [1] - The proportion of days with good air quality is 89.3%, an increase of 1.9 percentage points year-on-year [1] Group 2: Surface Water Quality Enhancement - The proportion of good water quality (Class I-III) in 3641 monitored sections is 91.4%, an increase of 1.0 percentage points year-on-year [1] - The proportion of inferior Class V sections is 0.6%, unchanged year-on-year [1] - In major river basins, the proportion of good water quality sections is 93.0%, an increase of 0.6 percentage points year-on-year [1] Group 3: Ecosystem Status Assessment - The trend of ecosystem degradation in China has been initially curbed, as reported in the "Blue Book" on ecological status [2] - The Yellow River basin has established a governance system, with ecological quality improving and vegetation extending approximately 300 kilometers westward [2] - Groundwater levels in the Beijing-Tianjin-Hebei region have risen by 2.59 meters and 7.06 meters for shallow and deep layers respectively since 2018 [2] Group 4: Regional Air Quality Data - The average PM2.5 concentration in the "2+36" cities of the Beijing-Tianjin-Hebei region is 37.3 micrograms per cubic meter, a year-on-year decrease of 11.6% [3] - The average proportion of good air quality days in the same region is 73.8%, an increase of 5.5 percentage points year-on-year [3] - 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% [3]