Lancet Report: Impact of London’s low emission zone on air quality and children’s respiratory health (Nov 2018)
Impact of London’s low emission zone on air quality and children’s respiratory health 
This report covers a study on the health impacts of London's LEZ originally introduced in 2008. The report finds "no evidence of a reduction in the proportion of children with small lungs over this period, despite small improvements in air quality in highly polluted urban areas during the implementation of London’s LEZ." This is despite the fact that "The percentage of children living at addresses exceeding the EU limit value for annual NO2 (40 μg/m³) fell from 99% in 2009 to 34% in 2013"