Yes they are.

But not cars built to Euro V. Source - Public Health England.

That said, statistics of DPF efficiency etc are somewhat subjective. At this time, less than 10% of cars are EuroV or VI compliant and add lorries etc to the equation and the issue is huge.

But an issue that is being addressed. The story as ever focuses on the damage and skirts over the detail. What can we do about lorries and buses? Difficult. What can we do about cars? They already have done. Just got to wait for old Volvos to rust up beyond repair now.

Public health epidemiology is fascinating and I find it most useful in helping plan services. It isn't used as much as favours to MPs of course, and ministers will always veto good ideas for unexplained reasons, but the evidence based reasons for having x available in y location take this into account.

For instance, when you plot respiratory disease, you get clusters around areas of high volume traffic. Nothing new in the story. Just interesting to see how it is used to give money to newspaper barons. (Politically, The Grauniad thinks public transport is as good in the whole of The UK as it is in London, so relies on tree huggers for its profit. )

On that subject. Are you interested yet in my BSkyB shares Bridge? If you had taken them off me when I got them, they are up 53% since then. A good capitalist profit of £22,300.00.