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It is estimated that air pollution shortens the lives of 40,000 people a year in the UK.

Rosamund Kissi-Debrah says her daughter Ella, who died at the age of only nine, was one of those. Rosamund says it could be the first case in the UK of someone dying of air pollution where it can be proved. Although an inquest into the primary school pupil's death found that she had died from acute respiratory failure, the inquest could not quite prove what had caused her asthma.

Rosamund is now pressing for a second inquest focusing on whether Ella's death was caused by London's air pollution.