Pandemic Lockdowns Did Cut Air Pollution—but With a Catch

Studies from all over the globe show short-term improvements in urban air quality, but experts are skeptical about how long they’ll last.

Last April, as people around the world sheltered in place against the Covid-19 pandemic, The Indian Express newspaper published a photo that had gone viral on Twitter, showing a slightly hazy deep blue sky over Uttar Pradesh, the most populous state in northern India. Above a garden trellis, the angular, white peaks of the Himalayan mountains were visible on the horizon like stiff whipped meringue. Pawan Gupta, a senior scientist with the Universities Space Research Association at NASA Marshall Space Flight Center, says that friends and family in

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