WHO data show that almost all of the global population (99%) breathe air that exceeds WHO guideline limits and contains high levels of pollutants.

Thirteen of the world's twenty most polluted cities are in India, with Byrnihat being the most polluted globally. Delhi remains the most polluted capi

Faridabad, Loni, New Delhi, Gurugram, Ganganagar, Greater Noida, Bhiwadi, Muzaffarnagar, Hanumangarh, and Noida are among the 13 most polluted Indian cities in the world's top 20 most polluted list.