As the first quarter of 2024 draws to a close, there is good news about Beijing's air quality. A few days ago, Chen Tian, director of the Municipal Bureau of Ecology and Environment, revealed in an interview with a "good start" in the first quarter that as of March 24 this year, Beijing PM2.5The average concentration was 38 micrograms per cubic meter, a year-on-year decrease of 19.1%, and the number of good days was 76, an increase of 14 days year-on-year, accounting for 90.5%, indicating that B