RAC European Breakdown spokesman Simon Williams said: "British motorists travelling to Paris, Lyon and Grenoble need to make sure they don’t get caught out by the new Crit'Air scheme that has come into force.
"The scheme requires vehicles to have an emissions sticker clearly visible on the windscreen. The penalty for not displaying one is an on-the-spot fine of between €68 and €135 (about £58 to £117).
"Foreign vehicles will be allowed to drive in central Paris without the sticker until 31 March, but our advice is to apply for one as soon as it is possible – from 1 February at the official Crit’Air website. We are aware of third-party websites already selling stickers for substantially more than French drivers are being charged by the French government, which motorists need to be wary of.
"From the beginning of February, the onus will be on UK car owners to check the Euro emissions standard of their vehicle by checking this table, visit the official Crit'Air website and apply for a sticker. We'd recommend drivers do this well before they intend to travel so they don't run the risk of driving without one."