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Tim Harford explains the numbers and statistics in the news and in life

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14/04/2018 GMT

Are We Breathing Unsafe Air?

BBC World Service - More or Less, Are We Breathing Unsafe Air?

The W.H.O. say 95% of people in cities breathe unsafe air, but what does 'unsafe' mean?

The World Health Organisation say 95% of people in cities breathe unsafe air, but what do they mean by 'unsafe'?

The World Health Organisation say that 95% of people who live in cities breathe unsafe air. But what do they mean by ‘unsafe’? And how do they calculate the levels or air pollution for every city in the world? Plus Mt Etna in Italy has reportedly moved by 14mm, but who is calculating this? And how do they know the answer with such accuracy? 
 
(Photo: People wear masks as smoke billows from a coal fired power plant, Shanxi, China. Credit: Kevin Frayer/Getty Images)

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