App reveals most polluted London Underground routes to travel on

A young innovator has won a top award for developing software to map the tube routes with the cleanest air

Like most Londoners, Tanya Beri has mixed views of the city's vast underground rail network that carries millions of passengers every day on its 11 lines and through its 272 stations. The tube keeps London moving, though often in cramped, uncomfortable and unhygienic conditions.

However, Beri believes she has found a way to improve travel for concerned commuters. She has developed a phone app that can direct passengers to routes that offer minimal air pollution.