The TANGO mission aims to put man-made emissions under a magnifying glass by monitoring CO2, CH4 and NO2 at unprecedented precision and at high resolution. It will show a unique combination of world-class atmospheric science, innovative instrument technology and a New Space development approach and will set a new standard for cost-effective Earth Observation using small satellites. ISISPACE led a consortium including the Netherlands Organisation for Applied Scientific Research (TNO), Royal Netherlands Meteorological Institute (KNMI), Netherlands Institute for Space Research(SRON) and 3D PLUS, in an 8-month study to consolidate the TANGO mission and show the feasibility of the concept.