Mayor questioned over air pollution

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Schoolchildren in the public gallery at City Hall all wearing hi-viz vests. Why? @itvlondon http://t.co/199Ih6ZBdm

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Lib Dem Stephen Knight questions the mayor about the air quality threat to schoolchildren. @itvlondon

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Knight asks mayor to introduce a smog warning system for school children.@itvlondon

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Mayor's Question Time

Mayor Boris Johnson has been answering questions from the London Assembly.