Outdoor pollution has risen 8% in five years with fast-growing cities in the developing world worst affected, WHO data shows

Outdoor air pollution has grown 8% globally in the past five years, with billions of people around the world now exposed to dangerous air, according to new datafrom more than 3,000 cities compiled by the World Health Organisation (WHO).

While all regions are affected, fast-growing cities in the Middle East, south-east Asia and the western Pacific are the most impacted with many showing pollution levels at five to 10 times above WHO recommended levels.

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This article was written by John Vidal for The Guardian on May 11, 2016. John Vidal is the Guardian's environment editor.