Ultra low emissions zone expansion cut London pollutants by up to 26% – study

Findings of lower diesel and PM2.5 emissions may fortify mayor as he extends scheme across whole city

The initial expansion of London's ultra low emissions zone (Ulez) for motor vehicles has brought notable benefits in reducing pollution, a study has found as the mayor prepares for a big extension to its boundaries.

The report by officials at the Greater London authority and Transport for London could help Sadiq Khan counter a political backlash to the imminent further expansion.