The attorney general has agreed to allow an application for a fresh inquest into the death from asthma of a nine-year old girl.
He acted after hearing new evidence linking Ella Kissi-Debrah’s death to illegal levels of air pollution near her home in south London.
Lawyers acting for the family said it was a “hugely important” step.
No individual death has previously been officially linked to illegal levels of air pollution.
In August, Ella’s mother, Rosamund Adoo-Kissi-Debrah, delivered