A Bill to make provision about urban air quality targets relating to diesel emissions; to require vehicle emissions targets and testing to reflect on-road driving conditions; to make the removal or disablement of pollution-reducing devices in vehicles a criminal offence; to provide powers for local authorities to establish low diesel emissions zones and pedestrian-only areas and to restrict the use of roads in urban centres by diesel vehicles; to promote the development of trams, buses and taxis powered by electricity or hydrogen in urban centres for the purpose of improving air quality; and for connected purposes.