Carys Williams (she/her)


I am a PGR based at the Wolfson Atmospheric Chemistry Laboratory at the University of York working with Prof James Lee, investigating urban NOx emissions. I previously completed an integrated master’s in chemistry at the University of York. Outside of work I enjoy hiking and cycling in the countryside in and around Yorkshire.


2018 – 2022: MChem from University of York

Research Interests

• Roadside NOx measurements
• Eddy covariance flux calculations of NOx emissions
• Crossover between science and policy

Project Title

Direct measurements of NOx emissions in central London: How are they changing and how can they be used to inform government policy?
Supervisors Prof James Lee, Dr Sarah Moller, Dr Will Drysdale

Project outline

The project will involve the investigation of NOx emissions in urban environments. Using eddy covariance calculations, NOx emissions can be measured at the BT tower in central London. These measurements are important as they inform how NOx levels, and their sources change over time in a major UK city. They offer the ability to directly compare to emissions estimates and can provide policymakers with a better understanding of whether emission control policies are achieving their goals. Additional measurements will be undertaken at roadside locations around the UK to gain a more complete understanding of vehicle NOx emissions.