Images taken over the first three weeks of March show less nitrogen dioxide over parts of the United States than the same time last year.
Nitrogen dioxide in the air comes primarily from the burning of fuel and forms from the emissions of cars, trucks, buses, power plants and off-road equipment, according to the US Environmental Protection Agency.The pollutant is noticeably lower in concentration in much of California, where places including the Bay Area and Central Valley have implemented stricter social distancing guidelines.
And while some states are still encouraging being outside and active alone, the State Department is advising against traveling abroad and the US and Canada have closed their borders to non-essential travel.Read MoreSatellite images released by NASA and the European Space Agency also show a dramatic reduction in nitrogen dioxide emissions in China as the nation implemented drastic coronavirus restrictions.
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