For the ‘Crit Air’ certificate if your car is pre 31/12/1996 then your car does not qualify anyway.
I have one for my 2008 Diesel C6 (level 3) and my new Petrol Mitsubishi (level 1) Having been to France in both, I have yet to see a restricted zone (but only hit the ‘Périphérique’, not central Paris though I read somewhere that Classic Cars are allowed into the centre on a Sunday without restriction?
But as it’s France, you may want to seek detailed qualification as Bernie says.
