The European Space Agency’s Sentinel-5 satellite is able to track all sorts of human-caused pollution, including nitrogen dioxide from exhausts and power plants.
from gizmodo http://www.gizmodo.co.uk/2020/03/satellites-show-italys-air-pollution-dissipating-as-covid-19-outbreak-worsens/
from gizmodo http://www.gizmodo.co.uk/2020/03/satellites-show-italys-air-pollution-dissipating-as-covid-19-outbreak-worsens/
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