20 worst cities overall
PM2.5 annual mean, micrograms per cubic metre
amount
Zabol
Iran
217
Gwalior
India
176
Allahabad
India
170
Riyadh
Saudi Arabia
156
Al Jubail
Saudi Arabia
152
Patna
India
149
Raipur
India
144
Bamenda
Cameroon
132
Xingtai
China
128
Baoding
China
126
Delhi
India
122
Ludhiana
India
122
Dammam
Saudi Arabia
121
Shijiazhuang
China
121
Kanpur
India
115
Khanna
India
114
Firozabad
India
113
Lucknow
India
113
Handan
China
112
Peshawar
Pakistan
111
0
50
100
150
200