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Disentangling drivers of air pollutant and health risk changes during the COVID-19 lockdown in China

Identifying different drivers of anthropogenic emission reductions

Figure 1 illustrates the evaluation of the CNY contribution to observed NO2 decreases. To better evaluate the anthropogenic emission reductions caused by the CNY festivities, different time periods including Before CNY, CNY, Extended COVID-lockdown, and Total COVID-lockdown are defined (see Supplementary Table 1 for definitions of time periods relative to the CNY day). Figure 1f shows the daily variation of the CAMSRA (Copernicus Atmosphere Monitoring Service Reanalysis) NO2 and the observed NO2 in 2020. It should be noted that CAMSRA can be used as counterfactual for a world in which the COVID-lockdown, CNY, and air-quality regulations did not happen because these emission reductions were not accounted for in the emissions database used. Although the observed NO2 and the CAMSRA NO2 show significantly larger differences during the COVID-19 lockdown period compared to Before…

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