The European Space Agency (ESA) SENTINEL-4 mission with main goal to measure gas concentration and aerosols in the atmosphere over Europe that will allow to monitor real-time air quality. The core technology is the Sentinel-4 ultra Ultraviolet-Visible-Near-Infrared (UVN) light imaging spectrometer instrument. The Sentinel-4 UVN will be integrated in the Meteosat Third Generation Sounder (MTG-S) satellite that will be placed in the geostationary orbit over Europe.