Hello,
When it comes to LEZs, people are now worried because they’ve been led to believe it’s the norm all over Europe, just to make them accept the situation in France...
I don’t think the situation in France is that different or much more restrictive than elsewhere in Europe, judging by this map (from the site you linked to...):

You can see that Spain, Italy, and Belgium seem to be even more affected.
And how you see the glass—half empty or half full:
In Sweden, there are a few zones in about half a dozen cities,
Actually, there are 8, which is more than the number of cities with over 100,000 inhabitants.
and a little in Denmark too,
5 cities might not sound like much. But Denmark only has 4 cities with over 100,000 inhabitants. In France, unless I’m mistaken, there are 22 cities with over 100,000 inhabitants and 15 LEZs...
A city like Rennes, for example, is trying to enforce it with a scale and zeal that raises serious ethical concerns.
What makes Rennes’ approach so unusually large-scale or overzealous?
(I do agree there’s an ethical issue with LEZs—though I’d call it more of a social justice problem.)
I regularly drive around Rennes in a 2015 car without a Crit’Air sticker, and so far, no issues. Am I just slipping through the cracks of the city’s zealous enforcement?