The Top 10 worst polluted places in the world are:

1. Chernobyl, Ukraine
2. Dzerzhinsk, Russia
3. Haina, Dominican Republic
4. Kabwe, Zambia
5. La Oroya, Peru
6. Linfen, China
7. Maiuu Suu, Kyrgyzstan
8. Norilsk, Russia
9. Ranipet, India
10. Rudnaya Pristan/Dalnegorsk, Russia

Top 10 Worst Polluted Sites Serve as Examples of Widespread Problems. Russia leads the list of eight nations, with three of the 10 worst polluted sites. Other sites were chosen because they are examples of problems found in many places around the world. For example, Haina, Dominican Republic has severe lead contamination—a problem that is common in many poor countries. Linfen, China is just one of several Chinese cities choking on industrial air pollution. And Ranipet, India is a nasty example of serious groundwater pollution by heavy metals.

http://environment.about.com  ¶ 11:28 AM