1. Saudi Arabia
Annual mean concentrations of fine particulate matter (PM2.5) in urban areas (μg/m3): 127.1
Causes of air pollution in Saudi Arabia vary from industrial pollution to indoor pollution and dust as well. Saudi Arabia produces largest amounts of crude oil in the world and production of crude oil inevitably contributes to air pollution. It comes as a no surprise that Saudi Arabia takes the number one spot on our list of 12 countries with the dirtiest air in the world.
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