London teenagers' road signs highlight effect of toxic air on people of colour

Choked Up group demands action from mayoral candidates to tackle traffic pollution

A group of teenagers who live in some of London's most polluted neighbourhoods are putting hacked" road signs up across the capital to highlight the disproportionate impact that toxic air has on people of colour.

Choked Up, a group who describe themselves as black and brown teenagers from south London", have set up the campaign, which is being backed by more than 100 doctors.