Top-Down NOX Emissions of European Cities Based on the Downwind Plume of Modelled and Space-Borne Tropospheric NO2 Columns. - Willem W. Verstraeten; Klaas Folkert Boersma; John Douros; Jason E. Williams; Henk Eskes; Fei Liu 032; Steffen Beirle; Andy Delcloo (Sensors, 2018)