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The Global Ozone Monitoring Experiment-2 (GOME-2) is one of the new-generation European instruments carried on MetOp-A (launched in October 2006). It continues the long-term monitoring of atmospheric trace gases started by GOME on ERS-2 and SCIAMACHY on Envisat. GOME-2 maps concentrations of atmospheric ozone, nitrogen dioxide, sulphur dioxide and further trace gases. Furthermore cloud properties and intensities of ultraviolet radiation are retrieved. These data are crucial for monitoring the atmospheric composition and the detection of pollutants. The GOME-2 level 3 (composites) and level 4 ( assimilated products ) are generated at DLR in the framework of WDC