Having started to look into this further, the council’s own studies into the current traffic show that 71% of the vehicles entering the zone meet the standards and wouldn’t pay. So the improvement in air quality will come from 29% of vehicles. They want to improve NOx.
A euro 3, KV6 will have to pay, but a euro 6 diesel won’t.
Which emits the most NOx?
http://www.eea.europa.eu/publication...port-emissions
The EU says the Euro 6 diesel.