A new London pollution charge covering large swathes of London is expected to hit one million drivers and raise six times as much as the congestion charge.
Mayor Sadiq Khan confirmed that ULEZ - being introduced in Central London next year - will stretch to cover an area surrounded by the North and South Circular roads from October 2021.
The £12.50 per day fee means cash-strapped Transport for London will collect between £700 million and £1.5 billion every year- a significantly higher amount than the £230 million collected from the congestion charge.
By 2021, owners of petrol cars that are more than 15 years old and diesel vehicles that are more than six years old will have to pay £12.50 to use them in London.
It is estimated that an additional 100,000 cars, 35,000 vans and 3,000 lorries might be affected by the expanded zone every day.
Gareth Bacon, leader of the Conservative group on the London Assembly, told The Times: 'This could be Sadiq's poll tax.
'It has flown under the radar and people do not know what is going to hit them.'
Mr Bacon, even went so far as to reference the current protests in France and that Mr Khan could have his own 'gilets jaunes' moment once Londoners realise how much they could be paying.
Mr Khan confirmed the extension of the ULEZ earlier this year after concerns about pollution in the capital.
The first part of the scheme will start on April 8, 2018, and vehicles driving within the area will need to meet new tighter emissions standards or pay the daily charge to travel.
It means those driving older vehicles across a major part London – an area 18 times greater than the central zone – will face a £12.50 daily fee if they use their cars.
The ULEZ charges across London will cover vehicles that fail to meet certain emissions standards and be policed by the capital's network of ANPR cameras.
But TfL's own 'integrated impact assessment' says about 565,000 cars registered in the capital will be liable if driven.
It also says 276,000 vans registered in London would be affected by it, as well as minicabs and HGVs, taking the total vehicles that could be eligible to one million.