Canadians can sleep a bit easier with no cities in Canada on this list.
1. Dhaka, Bangladesh
2. Lahore, Pakistan
3. Patna, India
4. New Delhi, India
5. Delhi, India
6. Urumqi, China
7. Muzaffarnagar, India
8. Xian, China
9. Xuchang, China
10. Peshawar, Pakistan
Source: Smart Air