Where is the air quality good in Beijing and Chengdu?

Generally speaking, the air quality in Chengdu is generally poor, and it is generally at the level of moderate and severe pollution. In the past, there were some problems in Beijing's air quality, but since last year, the Beijing Municipal Government has taken a number of measures to strengthen air control, such as implementing "loose coal control" and "construction site dust control" as required, reducing the emission of harmful substances such as PM2.5, and at the same time strengthening the control of environmental pollution such as vehicles, factories and buildings, and the air quality has performed well in cities across the country.

So overall, the air quality in Beijing is generally better than that in Chengdu. But the specific situation depends on the specific details, such as weather and local environment, which will affect air quality.