Satellite images show less pollution over the U.S. as coronavirus shuts down public places

By Madeline Holcombe and Sean O’Key
23 March 2020

(CNN) – As millions of Americans are kept from work, school and most public places as coronavirus is on the rise, satellite images show pollution on the decline.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. Another area hit hard by the virus, western Washington state around Seattle, also shows much lower concentration of the gas the past several weeks.

The images were created by CNN using Sentinel-5P satellite data processed by Descartes Labs. California is among eight states with stay at home orders in place, placing limits on people leaving their homes with exceptions for things like essential work, food shopping and picking up medicine. 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. [more]

Satellite images show less pollution over the US as coronavirus shuts down public places