London's harmful air pollution levels reach new highs

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London's harmful air pollution levels reach new highs

Researchers from both King's and Imperial College say more than 4,000 Londoners have been hospitalised in the last three years, because of the problem - a quarter of those cases involved children. Dr Samantha Walker, Director of Research and Policy at Asthma UK talks to London Live's Katie Pilbeam about the risks. 

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