TOPSHOT-INDIA-ENVIRONMENT-POLLUTION-HEALTH

TOPSHOT - Indian people walk amid heavy smog in Gurgaon on March 7, 2019, a day after it was placed top of a report on the world's most polluted cities for 2018. - India dominated a list of the world's most polluted cities in 2018, taking 22 of the top 30 spots, according to a Greenpeace report, with Gurgaon -- which has changed its official name to Gurugram -- topping the list. (Photo by Dominique FAGET / AFP) (Photo credit should read DOMINIQUE FAGET/AFP via Getty Images)