In my mind, domestic diesel vehicles shouldn’t be the first target, it should be commercial vehicles. 14% of Nox pollution in the UK comes from transportation but it does get released at sensitive high density areas, so why not target the buses, taxi’s, vans and lorries that drive at low speed’s and idle in cities, surely this would make a far higher dent in the problem than someone driving their diesel in rural areas or on motorways getting penalised