As per a World Population Review report, the Environmental Performance Index (EPI) is used to rank the countries regarding cleanliness.
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40 performance indicators across 11 categories are used to rank the countries. A higher EPI score translates into a country being cleaner than other nations.
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Denmark With a total EPI score of 77.9, Denmark is the cleanest and most environmentally friendly country.
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United Kingdom Ranking second on the list is the UK with an EPI score of 77.7. It fares higher on samitation, drinking and pollution.
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Finland Having achieved perfect score for sanitation, drinking water, and heavy metals exposure, Finland finds itself third on the list.
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Malta Surprising many, Malta finds itself on the list, primarily owing to perfect scores for drinking water and nitrous oxide emissions.
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Sweden The Nordic nation has an EPI score of 72.7 due to the government's extensive work to reduce CO2 emissions and increase use of renewable energy sources.
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Luxembourg With an EPI score of 72.3, the tiny nation with a population over 640,000, finds itself sixth on the list of cleanest countries.