This 2021 World Air Quality Report presents an overview of the state of global air quality in 2021. The report is based on PM2.5 air quality data from 6,475 cities in 117 countries, regions and territories around the world.

Twenty-two of the world’s 30 most polluted cities are in India, with Delhi being ranked as the most polluted capital city globally, a new report said . The report is prepared by Swiss organisation, IQAir, in the form of the ‘World Air Quality Report, 2020’, which has released globally.