The most air-polluted cities (measured in μg/m³ of PM2.5 concentration):
. 
Pakistan Lahore, : 97.4
. 
China Hotan : 94.3
India Bhiwadi : 92.7
Delhi: 92.6
Peshawar: 91.8
Darbhanga: 90.3
Asopur: 90.2
N’Djamena, Chad: 89.7
New Delhi: 89.1
Patna: 88.9
Ghaziabad: 88.6
Dharuhera: 87.8
Baghdad, Iraq: 86.7
Chapra: 85.9
Muzaffarnagar: 85.5
Faisalabad: 84.5
Greater Noida: 83.2
Bahadurgarh: 82.2
Faridabad: 79.7
Muzaffarpur: 79.2