The NHS has spent almost £65million on making a whole fleet of ambulances Ulez compliant.
NHS ambulance services in southern England have been made temporarily exempt by Transport for London (TfL) whilst the health service changes over from non-compliant vehicles.
Freedom of Information requests reveal that each vehicle costs £140,000 to replace.
The NHS has until October 2025 to replace the ambulances.
WATCH NOW: Ulez protester dresses up at the Grinch
The fleet stands at 534 – 279 from the South East Coast Ambulance Service and 255 from the London Ambulance service.
Tory chairman Richard Holden said: “These revolutions are shocking – even by Mayor Khan’s standards.
“Taxing hardworking people to simply drive their cars was bad enough – but Mayor Khan hammering our NHS ambulance services with tens of millions of pounds of extra cost, just to do their job and get to patients to hospital is downright disgraceful.
“The taxpayer should not be forced to swallow the cost of another one of Sadiq Khan’s ideologically obsessive vanity projects.”
Over 500 ambulances have been deemed as non-compliant
Susan Hall, the Tory candidate for next year’s mayoral election, said: “These eyewatering sums show another cost of the ULEZ expansion that Sadiq Khan would rather ignore.
“When our NHS is forced to spend tens of millions to comply with Sadiq’s tax-grab plan, surely the Mayor needs to fess up and admit that he’s got it wrong? But we know he won’t.
“He’s ignored Londoners, he’ll ignore everyone else – I am determined to see him out of office in May, and his ULEZ expansion will be gone on my first day as Mayor.”
A spokesman for the Mayor said: “The Ulez is about saving the NHS money in the long term.
“If no further action is taken to reduce air pollution, the cost to the NHS and social care system in London is estimated to be £10.4billion by 2050.”
Sadiq Khan’s controversial scheme was expanded in August to Greater London.