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COVID-19 Cleared the Air, But Not as Much as Expected

Steve Baragona

   COVID-19 lockdowns brought bluer skies to some of the world's smoggy
   cities.

   But not everyone's air got cleaner. And even with the improvements, air
   in some cities remained unhealthy.

   After initial reports of dramatic drops in air pollution, scientists
   looking more deeply at the data are finding the improvements were
   smaller than they expected. Not all pollutants declined. And the
   benefits varied widely from place to place.

   Their findings have implications for efforts to make the world's air
   healthier.

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