Pollution problem is just being pushed around | Letters

London’s proposed ultra-low emissions zone will do nothing to address the capital’s problem with polluting vehicles, writes Felix LeachThe mayor of London’s proposed ultra-low emission zone, to come into effect from 8 April 2019 (Report, 24 October), risks perpetuating the problem. The discourse currently focuses on NOx emissions, specifically those from diesel engines, but this is hardly the only pollutant. By insisting on Euro 4 (2005) standards for petrol cars and the signif