%0 journal article %@ 1680-7316 %A Matthias, V., Quante, M., Arndt, J., Badeke, R., Fink, L., Petrik, R., Feldner, J., Schwarzkopf, D., Link, E.-M., Ramacher, M., Wedemann, R. %D 2021 %J Atmospheric Chemistry and Physics %N 18 %P 13931-13971 %R doi:10.5194/acp-21-13931-2021 %T The role of emission reductions and the meteorological situation for air quality improvements during the COVID-19 lockdown period in central Europe %U https://doi.org/10.5194/acp-21-13931-2021 18 %X The lockdown can be seen as a big experiment about air quality improvements that can be achieved through drastic traffic emission reductions. From this investigation, it can be concluded that NO2 concentrations can be largely reduced, but effects on annual average values are small when the measures last only a few weeks. Secondary pollutants like ozone and PM2.5 depend more strongly on weather conditions and show a limited response to emission changes in single sectors.