London air quality improves after expansion of levy on polluting cars, says report Reuters UK Politics
ULEZ lowers air pollution most in London boroughs that opposed it, data reveals Sky News Politics
Nitrogen dioxide down 4.8%, carbon dioxide down 1% but traffic increases Politics
London air pollution down since Ulez extended to outer boroughs, study finds The Guardian Politics
London boroughs which opposed Ulez expansion see biggest pollutant cut – study The Independent Politics