For a diesel to be Euro 6 compliant it cannot emit more than 80mg/km of NOx gases, while a petrol car can emit no more than 60mg/km. Virtually every brand new car sold since September 2015 has had to meet the Euro 6 standard, while many cars were compliant before that. However, the way that emissions are tested has changed to become more Whether the ULEZ affects you, depends on the Euro Emissions Standard of your car. You can check if your car is compliant with the emissions standards of the ULEZ zone at tfl.gov.uk.. If your vehicle doesn't meet the standards, you will have to pay a daily charge of £12.50 for entering the zone, this being in addition to the congestion charge 2. ULEZ compliance is determined by total tailpipe emissions. It isn't decided on the age of the vehicle or its engine's Euro rating. Petrol cars emit less harmful emissions (particulate matter and nitrogen oxides) which means a 16-year-old Euro4 can qualify whereas a 7 or 8-year-old Euro5 may not. Guide contents What does Euro 6 diesel mean? Is my car a Euro 6 diesel? Why do I need to know if my car is a Euro 6 diesel? What are real world driving emissions tests and why is this important? What are manufacturers doing to meet the standard? Which pollutants come from my car? What are the Euro 6 criteria? Euro standards history Question 5. What makes any Euro 5 diesel engine car Non-compliant to Ulez when compared to a Ulez compliant Euro 5 car? Answer: To be compliant a diesel car must have NOx emissions equal to, or less than, 0.08 grams per kilometre and Particulate Matter emissions equal to, or less than, 0.005 grams per kilometre. A diesel car will only be Cars that are Euro 4 (2005 and later) will not be penalised for driving into Ultra Low Emissions Zones. With a Euro 6 car, you should face no extra charge for driving in a ULEZ. Cars that are Euro 6 compliant are also likely to be cheaper to tax (for the first year after April 2017, all the time for those registered 2001-2017). What are the Euro standards and when did they come into effect? Euro standards are a range of emissions controls that set limits for air polluting Nitrogen Oxides (NOx) and Particulate Matter ULEZ is a designated area in the capital where there is a £12.50 daily charge for driving vehicles that do not meet emission standards - so mostly older cars. Mayor of London Sadiq Khan Diesel cars and vans that do not meet Euro 6 standards (those typically bought new before 2015) do not comply. Nor do petrol cars and vans that are not Euro 4 or better (those typically bought new Use the online service to check or pay a charge in a clean air zone. The zones operate 24 hours a day, 7 days a week, every day of the year. The charge period runs from midnight to midnight. You eRw3L.