![An aerial view of New Delhi, India, engulfed in a thick layer of smog. EPA](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/CB4MHCGZGTQBMGSTKDJWLKXWMY.jpg?smart=true&auth=5e21fc0aa735ef44392fdc0d85bbb568a8127e766dfe0160a1814e07b75f5d3a&width=400&height=225)
An aerial view of New Delhi, India, engulfed in a thick layer of smog. EPA
An aerial view of New Delhi, India, engulfed in a thick layer of smog. EPA
Pollution killed nine million people worldwide in 2019
Pollution world’s largest environmental risk factor for disease and premature death, study finds