Health: Truth or Scare S03E02 - Episode 2

In today's programme they explore some of the invisible dangers that could be lurking in the air around us. Kevin takes some walkers down one of the most polluted streets in Britain to find out whether exercising in the city centre does more harm than good, Angela gets put through her paces to see if her sleeping habits are storing up problems for the future, and Steve Brown takes a look at whether radiation from mobile phones really is causing brain cancer.