Accessibility statement

Freya Squires


I am a PhD student working within Wolfson Atmospheric Chemistry Laboratories (WACL) at the University of York. I studied Chemistry at the University of York, during which I fell in love with atmospheric science! I was lucky enough to spend a placement year working at the Facility for Airborne Atmospheric Measurements (FAAM) which inspired me to carry on with research in atmospheric chemistry. My undergraduate project involved upgrading a commercial sulfur dioxide analyser for spatially resolved airborne measurements. I am excited at the prospect of continuing to work within the atmospheric science community.


MChem Chemistry with a Year in Industry (University of York, 2016)

Research interests

My predominant research interest is air quality. Specifically, my PhD project focuses on measurement of oxides of nitrogen (NOx) in megacities, including two field campaigns in Beijing. NOx is a significant air pollutant as well as being a precursor species for the formation of ozone (O3) with its major source being traffic exhausts. It is hoped that through improved measurement techniques, sources of NOx can be better identified and this research used to improve atmospheric emissions inventories.

Project title

Gas Phase Pollution in a Chinese Megacity.



Leeds York NERC SPHERES Doctoral Training Partnership (DTP)

Project outline

A series of NOx measurements will be made during two intensive field campaigns, forming part of a larger project investigating air pollution in central Beijing. NOx measurements will be made using a time-resolved state-of-the-art chemiluminescence instrument which will allow calculation of NOx flux (the rate of change NOx concentration moving through an area per unit time) using the eddy covariance technique.

Data obtained will then be inputted into a model to calculate a flux footprint for measured NOx. This enables measurements to be compared to existing emissions inventories from Beijing and be used to evaluate these inventories.


“Improving the performance of airborne measurements of atmospheric sulfur dioxide” at the Gas Analysis and Sensing Group 64th Colloquium, Cranfield University, Bedfordshire, 21st April 2016.

Wolfson Atmospheric Chemistry Laboratory

General enquiries:

Postal address: Wolfson Atmospheric Chemistry Laboratory, Department of Chemistry, Innovation Way, Heslington, York, YO10 5DD