According to Blacksmith University, an American scientific-research organization, three CIS states are among the most contaminated states in the world. These states are Russia, Ukraine and Azerbaijan.

The main reasons of ecological problem are industrial products in all contaminated states of the world, NEWSru.com reports quoting The Daily Telegraph. The first two regions are in China, the next two are in India. Peru is the fifth most contaminated state. Russia with Dzerzhinsk and Norilsk cities and Ukraine with Chernobyl occupy sixth and seventh positions respectively. The ninth position is occupied by Azerbaijan with its ‘international’ Sumgait city in the shore of Caspian Sea. Zambia closes the top ten of most contaminated states of the world.