4. Bangladesh
Annual mean concentrations of fine particulate matter (PM2.5) in urban areas (μg/m3): 88.8
Air pollution is an acute problem in Bangladesh, the number 4 on our list of countries with the dirtiest air in the world, as it is the case in many other countries that are densely populated. In Bangladesh, the worst place when it comes to air pollution is its capital city, Dhaka.
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