Wonderful solution, was my first though.
But I analyzed the main reason big cities in EU are polluted and concluded that
banning only pre 1997 will help very little.
Stage 1 ban should be all pre 97 vehicles and all diesels before 2004.
Also very strict annual inspection as diesels are very often modified (as they start to smoke,
easy fix is DPF removal) starting at 2004.
I was surprised when Norway planned to ban ALL NEW ICE VEHICLES so soon
Now they went to "vehicles without a plug". And that is way more reasonable.
BMW offers many. Mercedes offers some. VW GTE, i3 ReX and many more will come.I really like the idea of banning new vehicles WITHOUT a plug.
Nothing to do with vehicles that are already in use. Except force them to be in top notch shape.
PS. Pollution will be cut at least 90% if all vehicles before 2010 would be banned (and those which are not banned
are in good shape, no modifications).