Get all the latest news on coronavirus and more delivered daily to your inbox.  Sign up here.With mass lockdowns in place across the globe, the coronavirus pandemic is having a major impact on pollution, according to experts.“In California, the shutdown of businesses and activities related to #COVID19 has led to a decrease in nitrogen dioxide concentration,” tweeted NASA on Monday.“Nitrogen dioxide emissions come from cars and are a precursor to pollution known as PM2.5, or particulate matter smaller than 2.5 microns, which is hazardous to human health. As business and economic activities slowed over March, concentrations of NO2 decreased alongside them,” NASA added in a subsequent tweet.CORONAVIRUS QUARANTINES, STAY-AT-HOME ORDERS LEAD TO POLLUTION DROP, STUDIES FINDResearchers used data from the European Space Agency’s Sentinel-5P satellite to track the concentrations of nitrogen oxide.“Preventative measures recently adopted to prevent further spread of COVID-19 in the U.S. have prompted an overall slowdown in economic activity and fewer vehicles on the roadways,” said Dr. Aaron Naeger, lead aerosol scientist at NASA SPoRT (Short Term Prediction Research and Transition Center) in a blog post. “Since combustion engine powered vehicles can represent a major source of nitrogen dioxide (NO2) emissions, less traffic on the roadways may lead to


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