I don’t care about the particulate matter; I care about the stink. VW diesels used to stink to high heaven. Are the new requirements doing anything about the stink, or just making it invisible?
The new ones have a different odor, for sure. Removal of sulfur from fuel was a big help in the stink area. Newer fuel delivery systems have reduced the pollution and the particulates.
Now, they smell, to me anyway, like a campfire / wood stove burning..............