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Kenya's Eliud Kipchoge is the marathon world record holder, Olympic champion, a multiple winner in London and Berlin, and the man who came within 25 seconds of hitting the two hour mark for the distance. He's a big name and he's using this to help the United Nations campaign to tackle air pollution on World Environment Day. The UN says more than 90% of people breath in polluted air and that this claims around 7 million lives a year. Mr Kipchoge spoke to Newsday's Matthew Kenyon about what this pollution means for athletes.

(Photo: Eliud Kipchoge Credit: EPA-EFE/Armando Babani)