He warned the scheme will need “detailed consideration and consultation” before any charges could be introduced.
Mr Bedford said: The Interim Air Pollution Mitigation strategy identifies as one of the measures that a clean air zone is being considered for implementation in 2025.
“How this clean air zone will work, charges for the zone and other issues around its implementation will of course require further work over the coming months/years.
“A suite of other measures will be introduced earlier to achieve a 10 percent conversion of petrol cars to Ultra-Low Emission Vehicles (ULEV) by 2024/25.
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“Proposals such as the clean air zone will require detailed consideration and consultation which will include aspects of charging.”