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Identifying risk factors of coronavirus disease 2019 (COVID-19) for its clinical course became important during the current global health crisis. This study explores the relationship between ambient air quality and the clinical course of COVID-19 during the first German lockdown. Daily air pollutant concentrations ( PM10, O3 and NO2 ) and confirmed COVID-19-related hospital cases and deaths in the four largest German cities are used for multivariate regression analysis to study the correlation of air pollutants with COVID-19-related hospitalised or ICU patients and deaths. A significant positive association of  O3  with patients and deaths is observed.  NO2  shows a positive correlation with hospitalised and ICU patients. A  10 µg/m3  increase in  O3  is linked to a 27% (95% CI: 15% to 39%) increase of COVID-19-related deaths. However,  PM10  is associated with a decrease in deaths. Altogether, these findings indicate that air pollutants seem to have a significant influence on the course of COVID-19 infections.

international journal of environmental studies

Short-term association between COVID-19 related deaths, hospitalized patients and air pollution during the first lockdown in the four largest cities in Germany