5. Sweden
EPI: 80.51
CO2 emission: 4.47
PM2.5: 5.7
Sweden ranks 5th on our list of least polluted countries in the world in 2018. It has several major problems concerning pollution, which are acidification of lakes due to agriculture and pollution of Baltic Sea. Nevertheless, as being one of the least polluted countries in the world, Sweden is recycling or producing biogas from 99% of solid waste.
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