Lecture An OSSE to study the impact of S4/5 spaceborne observations on air quality data assimilation systems. Eskes, H.,Veefkind, P.; Williams, J.; Nijhuis, A.O.; de Haan, J.; Attie, J.; Abida, R.; Ricaud, P.; El Amraoui, L.; Curier, L.; Segers, A.; Kujanpaa, J.; Tamminen, J.; Lahoz, W. Publication details Presented at ESA Living Planet Symposium 2013, Edinburgh, United Kingdom, September 9-13, 2013. Link: http://www.livingplanet2013.org/abstracts/850159.htm