蓝天成常态！海淀空气质量，实现“四个首次”

Core Viewpoint - In 2025, Haidian District achieved significant milestones in air quality improvement, marking a historic breakthrough with multiple indicators reaching new heights, emphasizing the commitment to "ecological priority and green development" [1][3][12] Group 1: Air Quality Achievements - The annual average concentration of PM2.5 in Haidian dropped to 25.7 micrograms per cubic meter, breaking the critical threshold of 30 micrograms for the first time, with a year-on-year decrease of 16.0%, the largest improvement in the city [5][8] - The number of days with good air quality reached 310, surpassing 300 days for the first time, with an increase of 17 days from the previous year, resulting in a good air quality ratio of 85.2% [6][8] - All six major pollutants (PM2.5, PM10, SO₂, NO₂, CO, O₃) achieved national standards for the first time, marking a historic milestone in air quality management [8] Group 2: Pollution Reduction Strategies - In structural reduction, Haidian focused on green transformation in the transportation sector, achieving a 61.8% ratio of new energy vehicles, an increase of 25.8 percentage points from the beginning of the year [10] - In engineering reduction, 158 new green enterprises were established, with a total of 197 green enterprises in the district, raising the green enterprise ratio to 40.4% [10] - In management reduction, the average road dust load decreased to 0.31 grams per square meter, a year-on-year decline of 32.6%, with significant reductions in dust pollution from construction sites and roads [11]