Why is your vehicle congestion charge exempt though,- small engine, electric?
With dual fuel vehicles there is no way of knowing which fuel they are using,- could be using petrol or diesel like any other car driving through 'the smoke', LPG outlets are still not that common.
Having driven in and out of London on and off over the years, there are definitely days when you can see a brown coloured haze over the city, and that is just the polution that you can see!!
I quite agree with the need to reduce it, it's how you go about it.
The 9.00-5.00 commuters should be reduced for a start with the public transport network that London has and the Black Cabs that drive around looking for fares, quite a few of which belch out black smoke all the time, and while I am at it, why should they be allowed to use the bus lanes??