Research on the Changes of Air Quality in Chengdu During the COVID-19 Pandemic

As a public health emergency, COVID-19 has greatly affected all walks of life. It also has an impact on the environment. In order to systematically assess the impact of COVID-19 on the environment and the reasons for this impact, this paper takes Chengdu as an example for research. The air quality in Chengdu is analysed from two aspects of time and space, two dimensions of longitudinal and transverse. This paper selects six air pollution indexes (PM2.5, PM10, NO₂, CO, SO₂, O₃)and applies the dual-weight fuzzy comprehensive evaluation method to analyse. The results show that, no matter what the angle is, the air quality in Chengdu has greatly improved during the COVID-19 blockade and the concentration of various pollutants has been greatly reduced. But it's worth thinking about that this situation is always temporary from a longitudinal perspective. With the unblocking and the restoration of industrial production, the air pollution situation begins to return to previous state. This paper provides a reference for studying the changes in air quality during the COVID-19 pandemic and provides a useful supplement for air pollution control.