What causes the smog in Chengdu? Why is the smog in Chengdu?

1. Automobile exhaust: Large vehicles that use diesel are "recidivists" who emit smog particles, including buses, unit buses, large transport trucks and cars.

2. Terrain: The altitude difference in Sichuan Basin reaches 5,000 meters, and the terrain in mountainous, hilly and plain areas is quite different, which is relatively closed and prone to haze weather.

3. Weather: It is windy and light rain in Chengdu. This unfavorable meteorological condition is another important factor causing haze weather.