The dataset comprises the nitrogen dioxide (NO2) tropospheric column density obtained from the satellite instruments: Ozone Monitoring instrument (OMI) and Tropospheric Monitoring Instrument (TROPOMI), as well as Copernicus Atmosphere Monitoring Services (CAMS) atmospheric data store. The dataset covers two domains: the entire Poland and the main Polish cities.The data set comprises four files:1. OMI_PL_cities.zip – a compressed archive containing 18943 Netcdf-4 format files, each in the form of 2-dim maps of pixels, each file contains...