Indoor air pollution (IAP) is "the world's largest single environmental health risk" according to the WHO.
— Max Roser (@MaxCRoser) November 4, 2020
In poor countries it leads to the death of 4.3 million in a year.
Many countries made good progress in recent years: they got richer and reduced the IAP death rate. pic.twitter.com/rQPPhLCdGe
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