Which air is better, Beijing or Chengdu?

According to the data of 202 1, there are some problems in the air quality in Chengdu and Beijing, but overall, the air pollution in Beijing is relatively more serious. According to the data released by China National Environmental Monitoring Center, in 20021year, the average annual concentration of PM2.5 in Beijing was 45 μ g/m3, and that in Chengdu was 36 μ g/m3, which failed to meet the national standards. But the specific air quality depends on the season, weather and other factors.