
20. Ulaanbaatar, Mongolia
> Population: 1.4 million
> Average annual PM2.5 pollution per cubic meter: 92.2 micrograms
> Average annual PM10 pollution per cubic meter: 196.9 micrograms

19. Baoding, North China
> Population: 1.1 million
> Average annual PM2.5 pollution per cubic meter: 93.0 micrograms
> Average annual PM10 pollution per cubic meter: 147.0 micrograms

18. Narayangonj, Bangladesh
> Population: 543,000
> Average annual PM2.5 pollution per cubic meter: 94.2 micrograms
> Average annual PM10 pollution per cubic meter: 205.0 micrograms

17. Jodhpur, West India
> Population: 1.3 million
> Average annual PM2.5 pollution per cubic meter: 97.8 micrograms
> Average annual PM10 pollution per cubic meter: 180.2 micrograms

16. Patiala, North India
> Population: 510,000
> Average annual PM2.5 pollution per cubic meter: 101.2 micrograms
> Average annual PM10 pollution per cubic meter: 183.7 micrograms