Hitting it on the Head?

It has now been demonstrated that  nanoparticles (generated especially in diesel exhausts but also resulting from tyre wear and the braking systems of cars) can carry carcinogens into the human brain (https://www.theguardian.com/environment/2019/nov/13/air-pollution-particles-linked-to-brain-cancer-in-new-research). This strongly suggests that this air pollution (which often exceeds legal limits in UK cities), will increase the rates of brain cancers. It is somewhat concerning that many schools in urban areas are near busy roads and problems can be exacerbated by idling cars doing the 'school run'. The brains of children may be especially vulnerable.