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edscoble
Vehicle taxes are based on CO2 emissions, i.e how much they contribute to climate change. Unfortunately measures to reduce emmissions of greenhouse gassesses often come at the expense of toxic air pollutants like NO2.
Diesel cars are generally less bad for climate change as they do more miles per gallon but worse for local air pollution as they emit more NO2 and PM. Petrol cars are the other way around. Curently tax on cars and fuel is designed to mitigate CO2 emissions, in order to meet UK commitments on reducing green house gasses. This has caused a big uptake in the use of diesel.