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Atmospheric Chemistry

Covid-19

COVID-19 lockdowns had strange effects on air pollution across the globe

Unusually low emissions earlier this year are providing chemists with a unique opportunity to study the atmosphere, and they’re discovering new complexities

by Katherine Bourzac
September 25, 2020 | A version of this story appeared in Volume 98, Issue 37
A photo showing the Los Angeles skyline, clouds, and blue skies.

Credit: Ted Soqui/Sipa USA/Newscom | Clear skies prevailed over Los Angeles on April 15, 2020, during the early phase of travel and business restrictions designed to slow the spread of COVID-19.

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