New Delhi is the most polluted capital city in the world, reports IQAir

The report, featuring 4,700 cities which has been released globally, is based on PM2.5 data from 106 countries, calculated by ground-based monitoring stations, handled by government agencies mostly. It also recorded the improvements in air quality compared with 2019. 

India is home to 22 out of the 30 most polluted cities in the world, according to the annual IQAir World Air Quality Report, 2020. The report, featuring 4,700 cities which has been released globally, is based on PM2.5 data from 106 countries, calculated by ground-based monitoring stations, handled by government agencies mostly. It also recorded the improvements in air quality compared with 2019. Compared to north Indian cities, the cities in the Deccan recorded relatively better air quality, remained above the daily WHO limits of 25 µg/m3 for most part of 2020.