Boris Johnson must take action and show real leadership on London's pollution problems, Labour have said, as they attacked the mayor's comments that air quality in the capital "seemed perfectly fine".
Onkar Sahota, health spokesman for the London Assembly Labour group, said:
The mayor's comments are dangerously complacent - the London Ambulance Service has seen a 14% increase in people calling them with breathing problems.
In 2008, Boris promised to make London the greenest city in the world. Instead, we've seen wasted opportunities and wasted money.
This latest smog episode should act as a wake-up call to our mayor, whilst sand blown in from the Sahara is a contributing factor, Boris has not taken decisive action to tackle local air pollution.
Boris needs to take action and show real leadership on this issue.