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Having led the development of the London Air Quality Network to become the largest urban network in Europe I have solid grounding in air quality measurement techniques. I have also pursued network data analysis techniques to characterise sources, trends and changes in urban air pollution to determine if policies to improve air pollution are actually working. Much of my research is focused on the source apportionment of PM10 concentrations; again using a network perspective to create simple models to separate trends in primary PM concentrations from sources in London from changes in PM imported from outside the city; from Europe and beyond. This led to the important finding that primary PM10 in London has increased from 1998 to 2004 despite technological and policy measures to abate vehicle tailpipe emission. These apportionment techniques have been applied to quantify the local impacts of PM arising from sources that are not currently represented in emissions inventories including construction activity, waste management and more recent measurement programmes have focused on PM from urban wood burning.

As a member of the Medical Research Council, Health Protection Agency Centre for Environment and Health I have been able to work with toxicologists, clinicians and epidemiologists promoting the best use of air pollution measurements in health studies. I am a member of Defra’s Air Quality Expert Group, a regular contributor to the Guardian newspaper since 2010 and author of “The Invisible Killer – the rising global threat of air pollution and how we can fight back” published by Melville House Books.