On January 4, the Beijing Municipal Ecology and Environment Bureau announced another milestone in the ongoing efforts to improve the city's air quality. In 2025, Beijing recorded an annual average PM2.5 concentration of 27.0 µg/m³, dropping below 30 µg/m³ for the first time.

Throughout 2025, Beijing logged 311 days with good or moderate air quality, indicating an increase of 21 days year on year. The annual proportion of such days reached 85.2 percent, the highest level since monitoring began. Only one day of heavy pollution was recorded during the year, down one day from 2024 and the lowest on the monitoring record.

In 2025, the number of days with good or moderate air quality reached 348, an increase of 144 days compared with 2013. The ratio of days with good or moderate air quality rose from 55.9 percent to 95.3 percent. Notably, from March to October 2025, the city's PM2.5 levels remained low for 227 consecutive days — continuing for nearly eight months — far exceeding the 13-day streak in 2013 and marking the longest stretch since monitoring began.