Retrieval and Data Assimilation Algorithm Development for Tropospheric Ozone and NO2 from GOME and SCIAMACHY

Progress on the development of retrieval algorithms for tropospheric nitrogen dioxide and ozone from the GOME, SCIAMACHY, OMI and GOME-2 instruments is outlined. New techniques are reported that significantly improve on the existing products. A better insight in the accuracy has been achieved. GOME data has been made available through web access.