10 Countries With the Worst Air Pollution

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4. Tajikistan

Annual Average PM2.5 Concentration (2023): 49.0 μg/m³

Tajikistan ranks 4th on our list of the countries with the worst air pollution. As of 2023, the particulate matter concentration in the country is 49 μg/m³. Its PM2.5 concentration is 9.8 times higher compared to the WHO guidelines.

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