Pant by numbers: the cities with the most dangerous air – listed
by Guardian Staff from on (#2CGBB)
We've broken down the data on dangerous PM2.5 particles, and listed them region by region - to reveal the cities with the worst air in Europe, the US, Africa, Asia and more
Billions of people in cities around the world are exposed to dangerous air, but pollution levels vary widely - and the fast-growing cities of Asia and Africa are the worst affected.
We've broken down data from the World Health Organization on ultra-fine particles of less than 2.5 microns (PM2.5s) region by region. Paris's air may have almost twice as many PM2.5s as WHO recommended levels (18 micrograms per cubic metre compared with 10g/m^3) - but Delhi's air contains 122g/m^3, while Zabol, Iran, is the worst at 217g/m^3.
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