What influence did the corona lockdowns in 2020 have on the concentrations of PM10 and NO2 in Berlin? We investigated this using measurements and statistical modelling. The results (from a master's thesis) were recently published in the journal Atmospheric Environment.
Schatke, M., Meier, F., Schröder, B. and Weber, S., 2022. Impact of the 2020 COVID-19 lockdown on NO2 and PM10 concentrations in Berlin, Germany. Atmospheric Environment, 290: 119372. https://authors.elsevier.com/a/1fkwp_UlmK%7EDfr