A NASA aircraft expedition based in Stavanger, Norway during January and February 1989. The data consist of various chemical composition and meteorological measurements collected on board the NASA ER-2 and DC-8 aircraft, ozonesonde soundings from 3 stations (Angmagssalik and Scoresbysund, Greenland and Lerwick, UK), aerosol and temperature profiles from the SAM II satellite, global gridded NIMBUS 7 TOMS ozone column and selected radiosonde soundings from stations in the region of the experiment. This dataset is public.