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 before 2006). Drivers can check their car's status by going to TfL's vehicle checker and inputting the registration.

You can drive a diesel car to Heathrow Airport, but whether you have to pay a daily charge depends on your vehicle's emissions standard. Heathrow is located within the London Ultra Low Emission Zone (ULEZ), which operates 24 hours a day, every day of the year. For a diesel car to avoid the £12.50 daily charge, it must meet Euro 6 standards, which generally applies to cars first registered after September 2015. If your diesel car is older than this, you must pay the charge via the Transport for London (TfL) website. In addition to the ULEZ, Heathrow has its own Terminal Drop-Off Charge of £5 per visit, which applies to all vehicles (except blue-badge holders and certain emergency vehicles) regardless of their emissions. This is separate from the ULEZ and is enforced by ANPR cameras. If you are parking in a "Long Stay" or "Short Stay" car park, you only pay the parking fee and the ULEZ (if applicable), but not the £5 drop-off fee. It is highly recommended to check your vehicle's compliance on the TfL website before you travel to avoid heavy fines.