Why do we care about so much about monitoring #AirPollution? @AschbacherJosef is explaining it at the @CopernicusEU #Sentinel5P 'First Light' event, LIVE NOW from @DLR_en: https://t.co/s4JSU1GsCt pic.twitter.com/klxTCXbvcH

— ESA EarthObservation (@ESA_EO) December 1, 2017