Air pollution verdict shines political light on UK's invisible killer

Analysis: death of Ella Kissi-Debrah means MPs can no longer ignore dangers of dirty air

• Air pollution a cause in girl's death, coroner rules in landmark case

Air pollution is the invisible killer, unseen but also unacknowledged on the death certificates of the 40,000 people it sends to an early grave in the UK every year. But on Wednesday, for the first time, the lethal impact of toxic air was given a name and a face - Ella Kissi-Debrah, a nine-year-old girl from south London.

Politicians have been told for many years that dirty air kills but have ducked the decisions needed amid the noisy honking of the motoring lobby. The coroner's conclusion that air pollution was a cause of Ella's death means those politicians can no longer pretend that illegal levels of pollution are a victimless crime.