The country lists below are based on the Environmental Performance Index (calculated by Yale Center for Environmental Law & Policy, Yale University and Center for International Earth Science Information Network, Columbia University; in collaboration with World Economic Forum and Joint Research Centre (JRC), European Commission):
The 2012 Environmental Performance Index (EPI) ranks 132 countries on 22 performance indicators in 10 policy categories.
Top 10 dirtiest countries:
1) Iraq
2) Turkmenistan
3) Uzbekistan
4) Kazakhstan
5) South Africa
6) Yemen
7) Kuwait
8) India
9) Bosnia and Herzegovina
10) Libyan Arab Jamahiriya