[ciaranm]

Last I checked, Walking, Bus or Tube all registered as worse r.e. pollution. The article suggested it was mostly about duration of exposure, of which cycling was the lowest.

As for traffic incidents - I don't think they're massively different in London compared to the rest of the UK.

The study in the article indicates that risk of death _by any method_ goes down by 41%, though admittedly it's not based on London data.

-edit- Not the article I mentioned above, but similar results: http://www.bbc.co.uk/news/magazine-35717927 (cycling & walking perform better than public transport r.e. pollution intake.)

[sonthonax]

While one may be more exposed to pollution taking public transport, you breathe a lot more running or cycling.