The Mayor of London, Sadiq Khan, has issued a high air pollution alert for the capital and urged people to “be careful”. 

Londoners have been told to avoid unnecessary journeys in a bid to help lessen pollution levels. 

It comes after the Mayor has faced criticism over his plans to widen the Ultra Low Emission Zone across the whole of the capital. 

In part one, Frank Kelly is professor of community health and policy and Head of the Environmental Research Group at Imperial College London explains what the alert means and how concerned we should be moving forward.

In part two, we look at the criticisms of Ulez with Ross Lydall, the Evening Standard’s City Hall Editor & Transport Editor.

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