Experts will discuss if Boris Johnson is doing enough to improve London's air quality at a meeting of the London Assembly's Environment Committee later this morning.
Guests including the Mayor's Environmental adviser will answer questions from the Committee on Boris' plans to reduce air pollution.
The Mayor's measures include plans to ensure that by 2020 the vast majority of vehicles in the capital's centre during the working day emit low or zero emissions.
He has also suggested plans to introduce an Ultra Low Emissions Zone in central London.
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A 24-year-old man has been arrested on suspicion of murder after the body washed up on the Thames shoreline.
Seven people have now been arrested after a man died from serious head injuries
The 38-year-old officer was on his way home from a night shift when he collapsed. His death is not being treated as suspicious.