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Ljubljana - Slovenia ranks among the world's cleanest countries, a survey by US researchers has shown. On the list of 140 countries, Slovenia ranked 15th, the news portal 24ur.com reported on Thursday.
According to the survey by US Columbia and Yale universities, which developed an index to highlight the cleanest countries, Switzerland is the world's cleanest country, while the poorest African countries headed by Nigeria are at the bottom of the list.
Among the top ten are also Norway, Sweden, Finland, Costa Rica, Austria, New Zealand, Latvia, Columbia and France.
The other Slovenian neighbours have ranked behind Slovenia, with Croatia placing 20th, Hungary 23rd and Italy 24th.
Countries were assessed on the basis of the Environmental Performance Index which measures the effects of pollution on human health in 25 categories ranging from air and water quality to biodiversity and the use of pesticides.