London Mayor Sadiq Khan has confirmed the London Ultra-Low Emission Zone (ULEZ) will be expanded to reach the North and South circular roads from 25 October 2021.

It will be an expansion of the upcoming central London ULEZ, which goes live in April 2019.

Non-compliant vehicles will be charged £12.50 a day to enter the ULEZ – and, unlike the London Congestion Charge, fees apply 24 hours a day, 365 days a year.

Controversially, the ULEZ is particularly onerous for diesel car drivers. Only vehicles meeting Euro 6 emissions standards, introduced in 2014, will be exempt from the charge. The rules are more lenient for petrol vehicles; only those that don’t meet Euro 4 standards, introduced in January 2005, need to pay the charge.

It means that by 2021, says the Mayor of London’s office, petrol cars aged up to 15 years old will be exempt from the charge – but only diesel cars no more than six years old will escape it.

Expanding the 2019 central London Ultra-Low Emission Zone in 2021 will see it become 18 times larger. The Mayor’s office estimates this will affect 100,000 cars, 35,000 vans and 3,000 lorries a day.

Read more: Motoring Research