The shutdown is clearing New York's air—but don't get too excited, geochemist says

Vehicle travel, factories, and other air pollution sources are shutting down in the wake of the coronavirus pandemic, and satellites operated by NASA and the European Space Agency can see the difference. A miasma of nitrous oxides, a nasty mix of elements released during incomplete combustion, normally swathes much of China. Starting in late January, it largely dissipated. A few weeks later, a similar clearing started over Italy. In the last two weeks, satellites have observed pollutants disappearing over Seattle, Los Angeles, and New York.

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