New Delhi tops list of cities with dirtiest air

India's capital, New Delhi, has the worst air quality of any city in the world, according to figures published by the World Health Organisation.

The WHO measured the average levels of harmful particles known as PM2.5s to try to gauge which urban areas had the most dangerous pollution levels.

Smog obscures the view of the India Gate monument in New Delhi. Credit: Associated Press

Indian cities occupied the top four places on the global list, and 13 out of the top 20 dirtiest cities.

There were three Pakistani cities in the top 20, along with the Qatari capital, Doha and cities in Iran, Turkey and Bangladesh.

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WHO names UK towns with unsafe air pollution levels

London, Birmingham and Leeds are among nine British towns and cities which have been named and shamed for breaching safe levels of air pollution