During the BALTIC'15 campaign, conducted in August 2015 over the Southern Baltic Sea, trace gasses (CO2/O3/NOy/SO2) and aerosol particles (number concentration of total/non-volatile/Aitken mode/ Accumulation mode/Coarse mode/refractory black carbon, aerosol extinction coefficient, mass concentration of refractory black carbon were measured).Observations were performed on board of the Alfred Wegener Institute research aircraft Polar 5 during flight:- Scientific flight 2 (SF2) 28 August 2015 (BalticSea_2015_1508280401).

This is a compilation of all observations, for general information and further use please contact Marco Zanatta (marco.zanatta@awi.de).For additional information on every single parameter, please contact- CO2, O3: Heiko Bozem (bozemh@uni-mainz.de), Peter Hoor (hoor@uni-mainz.de)- SO2, NOy Ralf M. Staebler (ralf.staebler@canada.ca), Katherine Hayden (Katherine.Hayden@ec.gc.ca)- Total aerosol, non-volatile aerosol, extinction coefficient: Andreas Petzold (a.petzold@fz-juelich.de), Ulrich Bundke (u.bundke@fz-juelich.de)- Black carbon, Aitken, Accumulation, Coarse: Marco Zanatta (marco.zanatta@awi.de), Andreas Herber (Andreas.Herber@awi.de)- Aerosol chemical composition: Franziska Köllner (f.koellner@mpic.de), Johannes Schneider (johannes.schneider@mpic.de)