Introduction

The Mayor of London is facing one of his biggest tests yet with a legal showdown on 4th July over the expansion of the Ultra Low Emissions Zone.

Five Tory councils claim the Mayor acted unlawfully in the way he proposed to widen the zone to the Greater London boundary on 29th August.

Sadiq Khan’s controversial flagship policy to tackle the capital’s toxic air is emerging as a key issue in the 2024 mayoral election - and the row could also influence voters in the Uxbridge and South Ruislip by-election. 

The Evening Standard’s City Hall Editor & Transport Editor, Ross Lydall, explains how much is on the line with this legal challenge, the potential repercussions of the case, and whether the Ulez expansion could be Sadiq Khan’s downfall. 

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