The Dutch have been designing and building satellite atmospheric sensors, such as carried on ERS and Envisat, since the 1990s. Building on this technical heritage, the Tropomi instrument on the Copernicus Sentinel-5P satellite was developed jointly by ESA and Netherlands Space Office. The mission as a whole was designed and built by a consortium of 30 companies under the leadership of Airbus Defence and Space NL and UK. It has been realised thanks to close collaboration between ESA, the European Commission, the Netherlands Space Office, industry, data users and scientists.