This post comes with a health warning - one of our cars is diesel-engined, albeit Euro6 standard - so look out for bias in what follows.
There is no doubt that NOx levels in urban environments are excessive and that much of the blame lies at the wheels (or, more accurately, tail-pipes) of diesel-engined vehicles. Now Sadiq Khan has announced plans to tackle this issue in London at least. Justified? Yes, I believe so, although a switch back to petrol-powered vehicles may well exacerbate CO2 problems.
What hasn't been helpful is the vague statement by the prime minister that drivers of diesel-engined vehicles may be "compensated". If she means a scrappage scheme - all well and good - especially if the onward purchase is very carefully defined in terms of all polluting emissions. What would be stupid would be to enact some sort of monetary feed-back that ensured diesel-powered vehicle stay on the road for longer.
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