Air pollution in London has plunged since Sadiq Khan became Mayor, with a 94% reduction in the number of people living in areas with illegal levels of nitrogen dioxide and the number of schools in such areas having decreased by 97%. The pollution cuts were achieved by changes that deterred dirty vehicles from entering the city center and that have led to the use of cleaner vehicles. Putting low-emission buses on the dirtiest routes, ending the licensing of new diesel taxis and extending the amount of protected space for cycling have also contributed. Dr. Gary Fuller, an air pollution expert at Imperial London College said, “The changes in NO2 in central London and along main bus routes were some of the fastest that we’ve ever measured” in 30 years of monitoring. London plans to extend the ultra low emission zone in 2021 to further reduce air pollution in the city.