The Tropospheric Emissions: Monitoring POllution (TEMPO) instrument (see Smithsonian Institute, EO Portal, or WMO Oscar) is supposed to measure air pollution over North America from a geostationary orbit. It is in that sense comparable to Copernicus Sentinel-4 Ultraviolet, Visible, Near-infrared (UVN) (to be launched on EUMETSATs Meteosat Third Generation (MTG)-S in 2023) or GEO-Kompsat 2 Geostationary Environment Monitoring Spectrometer (GEMS). UVN and GEMS are confirmed to happen but I can't find a recent firm status on TEMPO. Does TEMPO have a confirmed platform? Apparently, the instrument has been built and delivered to NASA. The last I've seen is an unconfirmed proposal for it to fly on a commercial satellite in 2022, but this is scarce on details.

NO₂ from TROPOMI. Source: Smithsonian Institute, © KNMI/IASB/ESA/SAO.

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    $\begingroup$ That's odd... I wonder if GEMS isn't stationed over India enough to get correct readings, I'd expect India to have more red spots. Maybe not though. May ask a question follow up about how the parts that aren't covered are approximated. $\endgroup$ – Magic Octopus Urn Nov 20 '19 at 14:59
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    $\begingroup$ @MagicOctopusUrn None of those satellites are flying yet! The data in this figure are from polar orbiting satellites, which observe globally but only once a day, whereas the geostationary satellites will observe continuously but only in the area of focus. I don't know the chemistry explaining why the figure looks the way it does. $\endgroup$ – gerrit Nov 20 '19 at 15:01
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    $\begingroup$ "is X flying" can be interpreted in several ways due to ambiguity of the word choice and grammar. I would advise to rephrase. $\endgroup$ – user2705196 Nov 20 '19 at 15:56
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    $\begingroup$ @user2705196 Fair enough. I have rephrased. $\endgroup$ – gerrit Nov 20 '19 at 16:03

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