Key points from article :
Nine-year-old girl suffered a fatal asthma attack.
Attack linked to illegally high levels of air pollution.
Child lived 25m (80ft) from a notorious pollution hotspot.
Local air pollution levels breached EU legal limits.
No individual death has previously been directly linked to air pollution.
Striking association between her admissions and spikes NO2 & PM10s.
Mother says no one explained that air pollution worsen the asthma.
