Talking about Manhattan specifically, this is already about the most expensive place in the world and the only place in the US with this scheme in place, adding more traffic isn’t going to change that so no point in using it as an example of anything.
Plenty of countries that are not so car dependent have pedestrian zones in less affluent cities.
In the context of Greater London this is absurd.
Minimum emissions standards
Petrol: Euro 4 (NOx)
Diesel: Euro 6 (NOx and PM)
Petrol cars that meet the ULEZ standards are generally those first registered as new with the DVLA after 2005, although cars that meet the standards have been available since 2001
Diesel cars that meet the standards are generally those first registered with the DVLA as new after September 2015