Rise in racist abuse against Sadiq Khan linked to London clean air zone expansion

Study by Greater London authority finds mayor has received over 300,000 pieces of racist abuse since being elected

Sadiq Khan has received more than 300,000 pieces of openly racist or racially-oriented abuse on social media since he was elected London mayor, with a recent surge in such messages connected to his plan to expand the city's clean air zone, research has found.

The study, carried out by the Greater London authority, found that racist abuse against the Labour mayor, which peaked when he was targeted on Twitter by Donald Trump, has started to rise again this year.