Air on board diesel trains is five times worse than beside a busy street

Travelling on a diesel train can expose you to far higher levels of harmful particulates than standing beside a busy road, a Danish study has found. Diesel exhaust is associated with an increased risk of lung cancer, as well as other lung and cardiovascular diseases. Those sitting on carriages being pulled by a diesel engine, especially close to the engine, breathe in a much larger dose of diesel fumes.