I agree with Mike however, I chose to refrain from commenting earlier when I first saw the thread!
What I will say, it wasn’t many years ago that particulate matter of PM2.5 and below PM10 was a the top of the list with enviromental NGO’s. Now it seems Nox is atop of the list and also more prevalent in diesel’s, yet dieslel sales are reducing year on year. However the Western world especially Europe will just cary on going round and round, on it merry go round to be a greener than a meadow, yet seemingly happy to import whatever suits their whim.
As it stands European vehicle manufacturers are having a hard enough time as it lately, without throwing the burden and expense of euro 7 on them!