10 Countries With the Worst Air Pollution

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8. Nepal

Annual Average PM2.5 Concentration (2023): 42.4 μg/m³

Ranked 8th on our list, Nepal has an annual average PM2.5 concentration of 42.4 μg/m³. The most air polluted city in the country is Katunje, as of 2023. The PM2.5 concentration of Nepal is 8.5 times more than the WHO limit.

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