5 Most Air Polluted Countries in Asia

4. Tajikistan

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

Tajikistan ranks 4th on our list. The particulate matter concentration in the country is 49.0 μg/m³. Its PM2.5 concentration is 9.8 times higher compared to the WHO guidelines of 5 μg/m³.