>>I suppose the pollution generated from power stations providing the electricity for this car would fall into that category
Please learn a little something before making stupid statements like this. It never crossed your mind that the pollution per unit of energy released might differ between burning petrol in your car and burning coal in a power station?
Just as we talk about CPU power per watt these days, we need to compare CO2 per KWh for petrol Vs electric to see which is actually cleaner... it's possible your point might actually be true once all factors are taken into account but only by coincidence.
Plus of course you totally miss the point that lack of exhaust in a city centre is a good thing.