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]

Group 1 - The average PM2.5 concentration in Beijing for the first 11 months of 2025 was 26.5 micrograms per cubic meter, a year-on-year decrease of 16.7%, marking the best historical level for the same period since monitoring began [1] - The number of days with good air quality reached 282, an increase of 23 days compared to the previous year [1] - Beijing's ecological environment bureau reported significant progress in the "0.1 microgram" action plan, focusing on structural, engineering, and management emission reductions [1] Group 2 - The number of new green enterprises in Beijing increased by 1,090, raising the proportion of green enterprises to 37.5% [2] - The city exceeded its clean heating transformation targets, completing deep governance for 1,060 steam tons of gas boilers [2] - The average road dust load in the city decreased by 18.6% year-on-year, with the promotion of fully enclosed construction techniques for foundation pits [2] Group 3 - The ecological environment bureau plans to enhance air quality forecasting and focus on key areas and links to ensure the successful completion of the "14th Five-Year Plan" and the blue sky defense battle action plan by 2025 [2]