Children living in London’s ultra-low emission zone (Ulez) were almost four times as likely to switch to travelling to school by cycling, walking or scootering than those residing outside the area, new research has found. A University of Cambridge study, published on Wednesday, examined 2,000 children aged six to nine across 84 primary schools in London and Luton. The Ulez, which requires motor vehicles that do not meet minimum emissions standards or are exempt to pay a £12.50 ($16.5) daily fee for entering the zone, was introduced by London Mayor Sadiq Khan in April 2019 to improve air qualit…