Also the genuinely poor tend to not have a car.
In London it’s 0.76 which is still far, far from “a small number”
Not to mention that many poorer households don't even have a car in the first place.
It was a bit of a pain for me as I ended up swapping my 31 year old car for a 12 year old car but I'd rather have clean air and the 31 year old was getting a bit rusty anyway.
The change in air quality has made a big difference for me, I've been central for ~18 years and was thinking of moving out because the pollution was making my eyes sting all the time but it's much better now. Partly ULEZ and partly other stuff like the taxis going electric and the busses getting better engines.
Poor people.
I know this shocks boomers but the poorest people in any city don't own cars because they can't afford them - and they subsidize the vehicle owners through the taxes they pay.