Perhaps it’s the fact that we can’t see air pollution that is the reason why it doesn’t attract the same attention as plastic pollution.

Professor Ranjeet Sokhi from the University of Hertfordshire’s Centre for Atmospheric and Climate Physics Research has some surprises about where air pollution in St.Albans comes from, the effect on our health and who is most exposed to it.

And pupils from Camp School explain what they’ve been doing for this year’s Clean Air Day to raise awareness of the problem and try and reduce air pollution around their school