Top 10 most polluted cities in the world

1. Air pollution: Linfen, China

2. Industrial chemicals: Bhopal, India

3. Mercury: Central Kalimantan province, Indonesia

4. Pesticide: Kasargod, India

5. Chemical weapons/manufacture waste: Dzerhinsk, Russia

6. Organic chemicals: Sumgayit, Azerbaijan

7. Lead: Tianying, China

8. Hexavalent chromium: Sukinda, India

9. Radiation: Chernobyl, Ukraine

10. Persistent organic pollutants (POPs): Arctic Canada