Tomorrow sees the launch of the world’s first Ultra Low Emission Zone in central London. ULEZ will reduce traffic emissions by 45% in just two years and improve the lives of the 2 million Londoners living in areas that exceed current pollution limits. | Mayor of London

London's Mayor Sadiq Khan has got the green light to extend his controversial ultra low emission zone, Ulez. The High Court has thrown out a challenge by five Conservative-led outer London councils to stop it expanding to cover the whole of the city. The scheme hits drivers of the most polluting cars with a £12.50 daily charge. Its expansion was blamed for Labour's failure to win Boris Johnson's Uxbridge and South Ruislip seat in last week's by-election. | Channel 4 News

The Ultra Low Emission Zone expands from Tuesday 29 August to cover all roads in London boroughs. Here's what you need to know with our transport correspondent Tom Edwards. #ulezexpansion #ulez #london | BBC London