My interests lie in the application of atmospheric science to policy on air quality, the relationship between air quality and health, and on the linkages between air quality and climate change. I have a particular interest in the effectiveness of air quality policies on urban and regional air quality as evidenced by measurement. Recent studies on NOx trends are a good example.
Further interests include the establishment of more detailed relationships between air quality and health in the UK as part of projects funded by the MRC at the MRC-HPA Centre at King's College. Prior to joining Defra (see below) I carried out air quality impact assessments prior to developments at three major UK airports – Heathrow, Gatwick and Stansted, and have maintained an interest in the impact of aviation on air quality. More recently I have an interest in the effect of climate change policies on air quality and identifying optimal strategoes to maximise the co-benefits to air quality, health and climate change.
I have a continuing interest in ozone as a pollutant and was the first to demonstrate the impact of stratospheric air on ground level concentrations in the UK. I developed a simple, fast but accurate model used in the daily government air quality forecast for ozone.
I was until recently head of the air quality programme in Defra responsible for air quality policy and research to inform it. I currently chair the Executive Body of the UNECE Convention on Long Range Transboundary Air Pollution, and chair the Modelling Review Steering Group for Defra. I am lead author of policy section of the UNEP Assessment of Short Lived Climate Forcers.