Photo by Matthieu Paley paleyphoto / The Hooghly River, disappearing amid air pollution, snakes its way through Kolkata (Calcutta), India. This unpublished image was part of the global story “The Deadly Cost of Dirty Air,” which appears in the April edition of National Geographic magazine. For more insights into our world, follow paleyphoto #airpollution #kolkata #indiapollution Check out Nat Geo's link in bio for more on this story.