Sentinel 5-P

'Sentinel-5 Precursor is the first mission of the Copernicus Programme dedicated to monitoring air pollution. Its instrument is an ultraviolet, visible, near and short-wavelength infrared spectrometer called Tropomi. The Satellite is built on a hexagonal Astrobus L 250 satellite bus equipped with S- and X-band communication antennas, three foldable solar panels generating 1500 watts and hydrazine thrusters for station-keeping.'

While in a sun-synchronous orbit at 834 km, the satellite has a continuous view on planet earth at 13:30 local time, providing data related to air pollution through the Copernicus Open Access Hub. Anyone can access this information, which in turn is made possible by joint efforts by international organizations, both public and private.

Sentinel-5P was built by Astrium (United Kingdom), launched from the Plesetsk Cosmodrome in Mirny, Russia by Eurockot Launch Services GmbH, a commercial spacecraft launch provider based in Bremen, Germany. It carries the Tropomi spectrometer—the Tropospheric Monitoring Instrument which was constructed by 'a joint venture between the Netherlands Space Office NSO (formerly NIVR), the Dutch Royal Meteorological Institute KNMI, the Dutch Institute for Space Research SRON, TNO and Dutch Space.'
Within the Sentinel program, Sentinel-5 was followed up by Sentinel-6, manufactured by Airbus Defence and Space and launched in California by SpaceX.

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Sentinel 5-P, a monitoring satellite launched and maintained through international efforts

Sources: Wikipedia user SkywalkerPL. Sentinel 5-P