I don't know if this is justified or not, and I don't know whether the UK is ahead of or behind the UK on it. http://www.bbc.co.uk/news/business-44008098 But I wouldn't be too surprised to find an awful lot of hybrids - once their batteries are exhausted, are no better than any other car in a city environment, where pollution is felt most. But I also suspect that an awful lot of hybrid users are too bloody idle to ever plug their vehicles in, and run on petrol 100%, and I doubt whether any government measures can detect this or prevent it, however long they can run on batteries. I'm not blaming anyone here. If you come home from work after a hard day, driving through filthy weather and heavy traffic, what you want most is to sit down with a sherry or two before dinner and relax. Do you want to piss about with charging cables in the rain and the dark? You most certainly do not!