January 1 - February 25, 2020 January 1 - 20, 2020PNG February 10 - 25, 2020PNG NASA and European Space Agency (ESA) pollution monitoring satellites have detected significant decreases in nitrogen dioxide (NO2) over China. There is evidence that the change is at least partly related to the economic slowdown following the outbreak of coronavirus. At the end of 2019, medical professionals in Wuhan,