AJF3011:
Smaller yellow circle is the French Critair, only required in Paris & Lyon at the moment I think but no doubt will get extended to other cities soon enough.
As I understand it at the moment Lyon is only an emergency scheme ? ie only applies on the days when pollution is high. The only permanent ones so far are in Paris and Grenoble, with the Grenoble one only being for commercial vehicles (emergency one as Lyon for cars). As is normal it seems a bit messy… ( I realise that if you heading off somewhere it makes no difference if it’s temporary or permanent if it is in place when you get there 
)
Grenoble is different though in that, unlike Lyon, the ringroad (rocade sud) is included, because it is not an autoroute… A far as I know there is no way around without going on local roads, which are all included in the scheme.
All listed on this site :-
urbanaccessregulations.eu/countr … ncy-scheme
Just to say I don’t regularly drive trucks to these areas but spend a fair bit of time car driving around Grenoble / Lyon / Paris