Greater Manchester's Clean Air Zone has cost nearly £100m so far as the future of the controversial scheme is still unknown.
The plan to charge vans, taxis, buses, lorries and coaches which do not meet emissions standards has been 'under review' for nearly two years.
The proposal for owners of these vehicles to face a daily fee for driving on almost all of the city-region's roads was paused a few months before it was set to be introduced in 2022 following a huge public backlash.
Last week, transport bosses published details of a revised scheme which would see all charges scrapped with local leaders arguing that they are no longer needed to improve air quality.
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