10 Most Polluted Countries in the World Heading into 2024

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4. Nigeria

Score: 10

Nigeria is one of the most polluted countries in the world. According to the Environmental Performance Index (EPI) for water quality, the country has a score of 4.9 out of 100, the second lowest in the world, and only next to Chad. Causes of water pollution in Nigeria range from discharge of household and industrial wastes into rivers, to petroleum and other oil spillage in its water bodies.

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