Bad air can be dangerous, especially if you’re breathing it over a lifetime. In East Asia, years of chronic air pollution is one reason that wearing face masks was common well before the coronavirus pandemic. School children there are used to playing inside on bad air days. In South Korea, would-be presidents have made reducing air pollution part of their campaign platforms. In other cases, urban air has improved because of something that no one saw coming.

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Persons: it’s, Paiboon, Rajasekhar Balasubramanian, ”, Lee Hyung, “ It’s Organizations: New York State, World Health Organization, National University of Singapore, World Bank, Mexico City Locations: Midwest, United States, Cities, Asia, Africa, America, New, Bangkok, South Asia, East Asia, Seoul, South Korea, China, Beijing, Indonesia, Southeast Asia, Mexico, New Delhi