I have come across the potential need to display vehicle emission category stickers in certain French low emission zones. At the moment it is not clear to me whether this applies to bikes at all, or only for certain towns. You can easily get the sticker applicable to your bike at
[The official website for the Crit’Air sticker (air quality certificate) - Ministry of Ecological Transition | Order your Crit’Air sticker on the official website (certificat-air.gouv.fr)](https://www.certificat-air.gouv.fr/)
Does anyone know any more about this. I came across it looking at a route through Reims which has such a zone. As far as I can tell it doesn’t apply to motorbikes in Reims, but maybe it does elsewhere? Apparently it is enforced at the roadside by the police. May be worth getting one anyway if you are not sure as it only seems to be a few Euros? I don’t know if perhaps older bikes might actually be banned from certain areas if they don’t meet Euro 4 or whatever?