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Why does India's air look different from space?
22 June 2018
There is something very distinct about the air over India and the surrounding countries in South Asia.
It is the presence of formaldehyde - a colourless gas that is naturally released by vegetation but also from a number of polluting activities.
The elevated concentrations have been observed by Europe's new Sentinel-5P satellite, which was launched last October to track air quality worldwide.
It is information that will inform policies to clean up the atmosphere.
Image credit: Copernicus Sentinel data 2018/BIRA-IASB/DLR - Formaldehyde as measured by S5P-Tropomi: The map contains four months of observations up to April this year.