ZFE in France: Crit'Air stickers and low-emission zones explained

A ZFE (zone à faibles émissions) is a low-emission zone inside a French city where entry depends on your vehicle's Crit'Air sticker class rather than on the time of day alone. Some zones, like Paris, only restrict traffic on weekdays during set daytime hours; others apply the rule every day. Either way, the sticker in your windscreen — or the absence of one — is what a camera or officer checks.

• Paris / Grand Paris. A wide zone covering the capital and the inner suburbs, active Monday to Friday, 8am–8pm.
• Lyon and Grenoble. Zones covering the metropolitan core, applied every day with no time window.
• Strasbourg. A city-wide zone, also active all day, every day.
• Rouen and Reims. Smaller zones with slightly more permissive Crit'Air thresholds than the larger cities, but enforced the same way.
• More French agglomerations are adding a ZFE every year — always check the current rule before entering an unfamiliar city centre.

Every vehicle registered in France (and most foreign ones driving there) can be classified from Crit'Air 0 (electric and hydrogen) through Crit'Air 1 to 5, based on fuel type and Euro emission standard. In practice, petrol cars generally need at least Euro 2 to get a sticker at all, while diesel needs at least Euro 3 for the more permissive zones and Euro 4 or better for stricter ones such as Paris. The oldest, unclassified vehicles cannot get a sticker and cannot enter a ZFE at all, regardless of the day or hour.

The Crit'Air sticker is ordered once online through the official certificat-air.gouv.fr service, based on your vehicle registration document, and displayed on the windscreen. It does not expire and is not tied to a specific city or trip. Driving inside an active ZFE without the required sticker, or with a sticker class the zone does not allow at that time, is enforced by automatic camera checks and roadside controls. The consequence is a fine, issued regardless of whether the vehicle carries French or foreign plates — there is no exemption for visitors who did not know the rule.

• Order your Crit'Air sticker before the trip — it can take days to arrive by post and cannot be issued at the city limit.
• Check whether the zone you are entering applies all day or only during set hours, since this differs city by city.
• Do not assume a route that avoided a ZFE last year still does — the perimeter and the required class both tend to tighten over time.
• Treat a detour through a French city centre as a decision, not a shortcut, especially in Paris where the zone is large and the hours are strict on weekdays.

Set your fuel type, Euro standard and registration year once in Settings. ExitMe.app then checks every proposed route against the ZFE rules for each French city and time window it actually passes through, not just the destination. If your vehicle's Crit'Air class would not be allowed in a zone along the way at the time you would be driving through it, that route is disqualified before it is ever offered, with the reason shown alongside the recommendation.