People who drive in the zone in a vehicle which does not meet minimum emissions standards are now required to pay a £12.50 daily fee or risk a £180 fine, reduced to £90 if paid within 14 days.

Despite strong opposition to the scheme, the Mayor of London ploughed ahead with the move while introducing a scrappage scheme which enables residents, small businesses, sole traders and charities scrapping non-compliant cars to claim grants.

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Speaking on GB News, Nigel Farage has outlined a possible “way around” the daily charge that could save drivers thousands.

“There are some potential ways around Ulez”, he said.

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“You may think according to your rules, that your car is non-compliant.

“If you wonder why your car is being charged £12.50 a day, perhaps unfairly, you can contact your vehicle’s customer service, give them your vehicle details, and they will tell you what euro standard your vehicle is.

“It’s all euro standard. We may have had Brexit, but we haven’t left this stuff behind.

“It’s Euro 4 for petrol cars, it’s Euro 6 for diesel cars, and that is all to do with the emissions that come out of them.

“Even though your car may be technically too old, if your particulates and nitrous oxide emissions aren’t too bad, you can get a euro standard conformity certificate.

“It’s going to cost you £70-£100, but it may save you that money.

“If you want to save yourself what could be up to £4,500 every year, think about getting in touch.”

The Labour mayor has defended the expansion, saying: “The vast majority of Londoners want to see clean air and I recognise there are some Londoners with genuine concerns.

“My job is to try and address those concerns and I have been doing that.”

Khan said he was “disappointed” at the lack of Government support for the policy and its accompanying scrappage scheme.

He expressed frustration that the scrappage programme has no Government funding, unlike those run in several other English cities.

He said: “It was this Government that gave financial support to cities like Bristol, Birmingham and Portsmouth towards their clean air zones.

“If clean air is right for them then why isn’t clean air right for London?”

A Government spokeswoman said: “Both transport and air quality are devolved to London, which is why they are the direct responsibility of the Mayor of London.

“In fact, the Government has provided TfL £6 billion since 2020 to keep public transport moving and almost £102 million for projects specifically targeted to help tackle air pollution.”

To comply with Ulez standards, petrol cars must generally have been first registered after 2005, while most diesel cars registered after September 2015 are also exempt from the charge.

TfL says nine out of 10 cars seen driving in outer London on an average day are compliant.