Quote:
Originally Posted by iheartthed
Speaking of traffic, NASA released images comparing the March 2020 nitrogen dioxide levels over the northeast with the March 2015-2019 average levels.
March 2015 -2019 Average
March 2020
source: https://svs.gsfc.nasa.gov/4810
I was a little surprised that New York City still has so much activity. But the city didn't really shut down until the last week or so of March. I think April will show much lower levels.
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NO2 pollution certainly comes from the transportation sector (i.e., motor vehicle exhaust), but coal-fired power plants, metals manufacturing (coke refineries, mills, and foundries), and petroleum refineries also produce a lot.
That's why you don't see too much improvement in Detroit, Cleveland, Pittsburgh, and Philly-NYC.