10 Countries With the Worst Air Pollution

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1. Bangladesh

Annual Average PM2.5 Concentration (2023): 79.9 μg/m³

Bangladesh tops our list of the countries with the worst air pollution. As of 2023, the country has an annual average particulate matter concentration of 79.9 μg/m³, 16 times higher than the WHO standard. The most polluted city in Bangladesh is Dhaka.

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