As a regular cyclist (we do the school-run by bike, as you can see from my helmet-cam!) I'm aware of the dangers of air pollution, if not entirely sure what to do about them. There's nothing like being stuck behind a particular filthy car sort lorry exhaust while waiting in a traffic queue to make you realise how unhealthy cycling might be. This short film from the Mayor of London's office as part of a TfL campaign gives good advice whether you're cycling in the Capital or not. Well worth watching.