Sadiq Khan’s expansion of London’s Ultra Low Emission Zone out to the capital’s outer roads is one of his most controversial policies.

The Mayor says the charging scheme will improve air quality and health, but critics claim it's a stealth tax on Londoners hampering their choice to drive.

In this episode of the Standard’s series focussing on the 2024 race for City Hall, Hamish MacBain explores both sides of the argument at two of London’s busiest traffic locations.

Hear interviews with Imperial College London pollution expert Professor Frank Kelly by the A501, Marylebone Road, and motoring journalist Shahzad Sheikh - AKA YouTuber the BrownCarGuy, by the A10, Shoreditch High Street.

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