Ulez extension has had less impact on cutting toxic air than original central London zone, TfL data indicates

(Picture: PA Archive)

Sadiq Khan’s expansion of the ultra-low emission zone appears to have had limited impact on reducing toxic air levels in the suburbs, according to his latest research.

Transport for London on Tuesday published the first data on pollution levels since the Ulez was expanded from central London to the inner boundaries of the North and South Circular roads on October 25 last year.