You'll be fine as far as CritAir goes, but also, don't. Whatever Waze/Google tells you the Peripherique is never a good idea. Take the A3/A86 until you're well south of Paris, or better still take a completely different route.
If you go the toll road way, the roads lead to the peripherique.
But, after thinking about this comment, and times I used the peripherique always been busy.
@lynx started
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You'll be fine as far as CritAir goes, but also, don't.
Whatever Waze/Google tells you the Peripherique is never a good idea. Take the A3/A86 until you're well south of Paris, or better still take a completely different route.