An interesting analysis from 
In this study, the concentrations of the tropospheric NO2 which were extracted from the Sentinel-5P satellite were used in order to explain the spatial variation of fatality cases of Covid-19 in four European countries.
These results indicate that the long-term exposure to this pollutant may be one of the most important contributors to fatality caused by the COVID-19 virus in these regions and maybe across the whole world.
According to these results, more studies should be conducted which focus on additional factors such as age and presence of pre-existing and background diseases along with the impact of pre-exposure to NO2 and hypercytokinemia in order to verify their impact on fatalities due to the COVID-19 pandemic.
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