DGT Environmental Stickers Explained: 0, ECO, C and B Labels (2026 Guide)
The DGT environmental sticker classifies your car into one of four tiers — 0 (zero emissions, blue), ECO (green-and-blue), C (green) or B (yellow) — based on its fuel type and registration date, and the most polluting vehicles (petrol registered before January 2000, diesel before 2006) get no label at all. The cleaner your category, the fewer driving restrictions you face in Spain's low-emission zones.
Why the DGT created the four labels
In 2016 the Dirección General de Tráfico introduced the distintivo ambiental — a windscreen sticker that ranks every vehicle by how much it pollutes. The goal was practical: give town councils a simple, nationwide standard so they could decide which cars may enter restricted areas, qualify for parking discounts, or be exempt from circulation bans on high-pollution days.
The label is not a tax or a test of how you drive. It is a fixed classification tied to your vehicle's technical characteristics. Once assigned, it does not change unless the car is modified (for example, converting it to run on LPG). Roughly the cleanest 50% of the fleet earns a label; the rest do not.
The four categories: what each vehicle type gets
Your category is decided by the combination of fuel type and the date the vehicle was first registered. The table below summarises how the DGT assigns each tier.
| Label | Colour | Which vehicles qualify |
|---|---|---|
| 0 | Blue | Battery-electric (BEV), fuel-cell, range-extender, and plug-in hybrids with at least 40 km of electric range |
| ECO | Green & blue | Conventional (non-plug-in) hybrids, plug-in hybrids under 40 km range, and CNG/LNG or LPG (gas) vehicles meeting C-label limits |
| C | Green | Petrol cars from January 2006, and diesel cars from September 2015 |
| B | Yellow | Petrol cars from January 2000 (Euro 3), and diesel cars from 2006 (Euro 4/5) |
| None | — | Petrol cars registered before January 2000, and diesel cars before 2006 |
A few points cause confusion. The 0 label is the highest tier and is the only one with virtually no restrictions anywhere. The ECO label sits just below it and covers the hybrids and gas vehicles most expats actually buy. The split between C and B is the one people get wrong most often: a 2010 petrol car is a C, but a 2010 diesel is only a B, because diesel emission standards lagged behind petrol. Heavy vehicles, buses and vans follow the same logic with their own cut-off years.
Registration-date cutoffs and which cars get NO label
The two dates worth memorising are the no-label thresholds, because they decide whether a car can enter many city centres at all:
- Petrol (gasoline): registered before 1 January 2000 = no label.
- Diesel: registered before 2006 = no label.
These dates line up with European emission standards: petrol cars hit Euro 3 around 2000 and diesel reached Euro 4 in 2006. A vehicle below those lines is in the most-polluting half of the fleet and the DGT does not issue it any sticker. Importantly, "no label" is itself a status — it is not a mistake or an oversight, and there is no way to upgrade an old engine into a category it does not qualify for.
How to check your car's label by number plate
You do not have to guess. The DGT publishes a free lookup on its electronic headquarters (sede electrónica) where you enter your number plate (matrícula) and it returns your exact category. Correos and most authorised vendors run the same check automatically when you order a sticker, so the label they sell you always matches the official record. If the lookup returns no label, that is the definitive answer — your vehicle is in the unlabelled group.
Where to buy it and how much
The sticker is sold through official channels at a low, fixed cost. You only need your vehicle registration document or number plate.
| Where | Notes |
|---|---|
| Correos (post offices) | The main channel; in person or via Correos Market online |
| Estancos (tobacconists) | Available since late 2024 — just give your number plate |
| Authorised workshops & gestorías | CETRAA/registered workshops, administrative agents (gestores) |
The base cost is around 5 €. Some vendors charge a little more (Correos has charged about 6 €), and online orders may add postage. You buy the sticker once; it does not need renewing unless your vehicle's classification changes.
Is the sticker mandatory? National vs municipal rules
This is the most misunderstood part. There is no nationwide law forcing you to display the sticker on your windscreen. The DGT recommends it but does not fine you across Spain for driving without it stuck on.
The obligation is municipal. Several cities — Madrid being the clearest example — require the label to be visibly displayed to circulate within their boundaries. Madrid's Sustainable Mobility Ordinance specifies that the sticker should go on the lower-right corner of the windscreen (interior side), or, failing that, anywhere clearly visible on the vehicle. In Madrid, simply failing to display the visible sticker is a minor (leve) infraction, sanctioned with a fine of up to around 100 €; the higher fine of up to 200 € (reduced to around 100 € with prompt payment, pronto pago) applies mainly to illegally entering or circulating in a low-emission zone (ZBE), for example with a no-label car.
The practical takeaway: even though it is not a national requirement, if your car qualifies for a label, buy it and stick it on the lower passenger-side of the windscreen. It costs a few euros and it is what every low-emission zone (ZBE) checks for. For how those zones work city by city, see our dedicated low-emission-zone guide.
Cars without a label in 2026: where you can still drive
Unlabelled vehicles face the heaviest restrictions, and the squeeze tightened in 2026. As a rule, cars with no label are barred from the strictest low-emission zones in large cities and increasingly cannot enter dozens of municipal ZBEs at all. Madrid moved to ban unlabelled vehicles across the whole municipality, though the city council granted moratoria allowing some locally-registered cars to keep circulating during a transition period — exact dates and exemptions vary, so always confirm with the specific town hall.
The one widely-recognised legal route to keep driving an unlabelled car in restricted zones is to have it reclassified as a historic vehicle (vehículo histórico). This generally requires the car to be at least 30 years old from manufacture, kept largely original, and formally registered as historic with the DGT — after which it is usually exempt from ZBE bans, though limited to circulating in low-emission zones up to 96 days per year without an environmental label. It is a workaround for genuine classics, not a loophole for everyday old cars.
How environmental-label questions appear on the DGT theory test
Environmental labels show up on the DGT theory exam, usually in the "Cuestiones de seguridad vial" and environmental-driving blocks. They are factual, memory-based questions — exactly the kind you can lock in with practice. Expect them in a few recognisable shapes:
- Matching a vehicle to its label: "An electric vehicle carries which environmental sticker?" (Answer: 0.)
- Identifying the cleanest category: questions asking which label corresponds to zero-emission vehicles, or which is the most restrictive.
- Who issues the sticker: the correct answer is the DGT, not the town council or the manufacturer.
- Where it goes: the windscreen / a visible point on the vehicle.
- Purpose: linking the label to low-emission zones and pollution-based traffic restrictions.
You do not need to memorise every registration cut-off year for the exam — the test focuses on the concept (label tiers, who issues them, why they exist) rather than asking you to date a specific diesel. Knowing that 0 is the cleanest, that ECO covers hybrids and gas, and that the DGT classifies vehicles by emissions is enough to answer almost every version of this question correctly.
Because these questions are pure recall, they are some of the easiest free marks on the exam — provided you have seen the four categories laid out once and practised a handful of real questions on them.