A classmate of the girl whose death was the first to be blamed by a coroner on air pollution has set up a campaign group with fellow teenagers to tackle the issue in their neighborhoods. Ella Adoo-Kissi-Debrah died aged nine in 2013. She had asthma and lived near the South Circular, one of London’s busiest roads.

Anjali Raman-Middleton, 17, grew up with Ella and set up Choked Up with three teenagers in August to lobby against the pollution that killed her. She met the other founders, Destiny Boka-Batesa, Kaydine Rogers and Nyeleti Brauer-Maxaeia, on a training course with Advocacy Academy, a charity that teaches about campaigning.