Environmental Science
4 years ago

COVID-19 lockdown leads to significant drop in air pollution in Western China.

Aerosol and Air Quality Research
Temporal Variations in the Air Quality Index and the Impact of the COVID-19 Event on Air Quality in Western China
Jiajia Zhang, Kangping Cui, Ya-Fen Wang, Jhong-Lin Wu, Wei-Syun Huang, Shun Wan, Kaijie Xu

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The study looked at air quality in three cities in Western China from 2017 to 2019 and how it changed during the COVID-19 pandemic in 2020. They found that air quality was better during the pandemic, with lower levels of pollutants like PM2.5 and NO2. However, O3 levels actually increased because of less NO2 reacting with O3. Overall, air quality was worse in the winter months, with Chengdu having the highest average AQI. The study shows that actions taken during the pandemic had a positive impact on air quality in the region.