Does a 2018 petrol car need anything more than the badge?

No. The green Plakette is the whole requirement for petrol in Cologne. It corresponds to pollutant group 4, which for petrol engines is defined by having a regulated catalytic converter rather than by a Euro number, and a 2018 car has one by definition.

Which parts of Cologne are inside the zone?

The zone follows the inner-city ring road, so the Dom, the Altstadt and the Rhine waterfront are all inside it. The Autobahn through the city is outside, which is why a through route that stays on it is unaffected.

What does the badge cost and where does it come from?

EUR 5-15, from a TUEV or DEKRA station, a Zulassungsstelle or online. Ordering online takes about a week; in person you walk out with it. It is issued against the registration document and lasts the life of the vehicle.

Is the fine per entry?

No. It is a flat EUR 100 for being in the zone without a valid badge, and the Flensburg penalty point that once came with it was abolished in 2014.

Does the same badge work in other German cities?

Yes. One green Plakette is valid in every German Umweltzone. The underlying rules can differ locally - Stuttgart and Munich add diesel bans on top - but the badge itself is national.

Cologne 2026: Petrol Is Judged by Catalyst, Not Euro

Checked against official sources 20 Sep 2026 · Next review 2026-12-19

Cologne judges petrol by its catalytic converter, not its Euro class, so a 2018 Euro 4 qualifies for the green Plakette without argument. The badge is the actual requirement: EUR 5-15 once, valid for the life of the car, and its absence inside the ring costs a flat EUR 100 — no licence point since 2014.

Can your car enter Cologne?

Enter your vehicle's fuel + Euro class → instant verdict for Cologne (Umweltzone). Fine if wrong: EUR 100.

Check now

The rule is about hardware, not vintage

Pollutant group 4 — the green badge — was written around what the exhaust system does. For petrol that is a regulated catalytic converter, fitted as standard on German petrol cars since the early 1990s. For diesel it is Euro 4, or Euro 3 with a retrofitted filter. The consequence is counter-intuitive and worth stating plainly: a well-kept petrol car from 1993 can carry the green badge while a diesel from 2003 cannot. A 2018 petrol Euro 4 is never in doubt.

The zone is where you were going anyway

Cologne’s Umweltzone follows the inner-city ring road, taking in the Dom, the Altstadt and the Rhine waterfront. A visitor driving into Cologne at all is almost certainly entering it, which is why the badge is better treated as a fixed cost of the trip than as a routing decision. The Autobahn through the city stays outside, so pure through-traffic is unaffected.

Getting the badge before it matters

TUEV or DEKRA station, or a Zulassungsstelle — issued over the counter against the vehicle papers
Online, from EUR 5-15 — allow about a week for delivery
Valid for the life of the vehicle, in every German zone, with no renewal

Only green is worth buying; the yellow and red badges have admitted nobody to a German zone for years.

How the check actually happens

Not at the boundary. Every road in carries a green sign, and then police and parking control look at windscreens inside the zone. That is the detail that turns an otherwise compliant trip expensive: the EUR 100 reaches a parked car as readily as a moving one, and it is charged for the missing badge, not for the engine.

Cologne checklist for this car

✅ Treat the badge as compulsory for any Cologne visit — the sights are inside the ring
✅ Confirm the catalytic converter is a regulated one; any Euro 1 or newer petrol has it
✅ Order the Plakette a week ahead if buying online, EUR 5-15
✅ Fix it to the windscreen rather than carrying it in the glovebox
✅ Remember the Autobahn is outside the zone, if you are only passing through