London air pollution at record high
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London kids on high air pollution: 'Our eyes start stinging'

29 January 2017 Last updated at 14:18 GMT

Air pollution in some parts of London has been so bad recently, that the Mayor of London has decided to use the highest pollution level alert for the first time.

Students at a school in the heart of London tell us what it's like living in a place where the pollution levels are so bad...