The 20 Worst Cities Worldwide For Air Pollution
The highest levels of small and fine particulate pollution (PM10 and PM2.5) were recorded in South-East Asia and the Mediterranean. According to the WHO, Onitsha in Nigeria has the highest levels of PM10 worldwide, followed by Peshawar in Pakistan and Zabol in Iran. The level of PM10 in Onitsha is nearly 30 times the recommended level.
This chart shows annual mean micrograms per cubic metre of PM10 in cities worldwide.