An Financial Times Investigation shows that air pollution on the Tube is as much as 10 times above health guidelines.

If you are one of the 4.8m passengers who uses the London Underground every day, you might think you are escaping the pollution dangers from road travel, with its exhaust fumes and soot.

The reality is very different. Although its health risks have been little studied and little publicised, other than a handful of recent scientific papers, the Tube is by far the most polluted part of the city. Fine particles of dust, metal, skin and clothing fibre have built up in the

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Methodology: How the findings were generated