By Jack Mendel London has emerged as a “world leader” in tackling toxic air pollution according to a new report by chief medical officer Sir Chris Whitty. His latest findings reveal the dangers of pollution in the capital, but show Nitrogen Dioxide (No2) concentrations by roads are down a fifth in inner London and 44 per cent in central. The implementation and expansion of the Ultra Low Emissions Zone was heralded as a key contributor to the decline by Mayor of London Sadiq Khan. The report also said the improvement had narrowed the “inequality gap in exposure” to pollution, with socio-economi…