FORUM

If you ever go to Paris, or a few other places, you have been required for the last few days to show a sticker indicating how dirty your car's exhaust is. It is always an offence not to show the vignette : on days of high expected pollution it will be an offence to use the car at all if it is above a certain score, basically older diesels. More details are here

https://www.certificat-air.gouv.fr