The movie above illustrates a visualisation of N02 in London by CASA, University College London,in association with the Environmental Research Group at Kings College London.

Nitrogen dioxide (NO2): NO2 is produced in high temperature combustions processes and chemical reactions in the atmosphere. Road transport is responsible for 60 per cent of emissions of NOx (the pollutant that causes NO2) in London. It can affect the lungs and airways when exposed over long periods or at high concentrations over a short period.