Environmental campaigners place great importance on people using public transport over driving, but when it comes to the London Underground, the tables have been turned.
A recent study, published by the University of Surrey found that Londoners who travel on the Tube are exposed to 68mg of harmful pollutant PM10 daily, whereas car drivers experience 8.2mg. Describing the results as an "environmental injustice" against Londoners, lead author Dr Prashant Kumar is calling for more to be to done to reduce the health risks.