Sadiq Khan's planned Ultra Low Emission Zone (ULEZ) expansion in London will face a legal challenge from five Conservative-run councils, the High Court has ruled.
The London boroughs of Bexley, Bromley, Harrow, Hillingdon, together with Surrey County Council, were granted permission to challenge the mayor's proposals.
The High Court ruled the local authorities could proceed on two "arguable" grounds - the legal basis for ULEZ and if it could be scrapped.
ULEZ covers central London and its boundary is currently the North and South Circular roads.
Should it expand to the capital's borders with Buckinghamshire, Essex, Hertfordshire, Kent and Surrey, drivers in those areas would have to pay a £12.50 daily fee from 29 August to travel to the capital if their vehicles fail to meet emission standards.
The councils involved in the legal challenge believe "relevant statutory requirements" were not followed, expected compliance rates in outer London were not considered and the proposed scrappage scheme was not consulted on.
They also disputed the handling of the overall consultation process and a failure to carry out a cost-benefit analysis of the plan.
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