'Invisible killer': UK government urged to tackle air pollution

British Heart Foundation says 15m Britons are exposed to toxic levels of pollution

Almost a quarter of people in the UK are being exposed to dangerous levels of air pollution with potentially devastating health consequences, according to analysis.

The study by the British Heart Foundation (BHF) found that about 15 million people in the UK live in areas where average levels of PM2.5 - a tiny toxic particle that predominantly comes from vehicle emissions, wood burning and construction - exceeds guidelines set by the World Health Foundation.