Group Members

Jon Abbatt (PI)

Jon obtained his BSc from the UofT Chemistry Department in 1984 and spent 16 years in the United States (Harvard PhD, MIT Post Doc, University of Chicago Assistant/Associate Professor) before returning to UofT. His research interests are in atmospheric and environmental chemistry, with a focus on particulate, cloud, and indoor chemistry. Specific research topics include: rates and mechanisms of multiphase chemistry in outdoor and indoor environments; the role of particles in promoting the formation of both liquid water and ice  clouds; field measurements of VOCs and aerosol composition especially in remote regions such as the Arctic; aerosol chemistry related to  health effects.


Jon has been on the editorial boards of Atmospheric Measurement Techniques, Scientific Reports, Energy and Environmental Science, and Journal of Geophysical Research – Atmospheres. He is a member of the NASA/JPL Data Evaluation Panel for Atmosphere Modeling and was co-chair of the 2011 Gordon Conference on Atmospheric Chemistry.  He has served on the scientific steering committee of the International Global Atmospheric Chemistry project (2011-2014) and on the NSERC Grant Selection Committee for physical and analytical chemistry. He has been given the Canadian Institute for Chemistry (CIC) Environmental Research Award (2012), was made a Fellow of the American Geophysical Union (2013), was elected to the Royal Society of Canada (2014) and was given a Killam Research Fellowship (2015).   He is the principal investigator of a large NSERC-funded climate-clouds-aerosols research network, NETCARE (Network on Climate and Aerosols: Addressing Key Uncertainties in Remote Canadian Environments).   

Jenna Ditto

Jenna completed her Ph.D. at Yale University in 2020 with Dr. Drew Gentner. Her graduate research focused on developing and applying non-targeted liquid chromatography and tandem mass spectrometry tools for the detailed chemical characterization of functionalized gas- and particle-phase organic compounds. Jenna joined the Abbatt group in September 2020. She is currently studying the chemical transformations of cannabis smoke on indoor surfaces, and impacts on indoor air quality. 

Jillian Downey


Jillian received her B.Sc. in Chemistry at Mount Allison University in May 2022. In her undergraduate degree, she studied the relationship between antioxidant decay and oxidant production from the inhalation of common quinones found in aerosol. Jillian joined the Abbatt group in September 2022, her research focuses on the heterogenous chemistry of ozone on indoor surfaces. 

William Fahy

Will received a joint B.Sc./M.Sc. in chemistry at Carnegie Mellon University in 2021 under Professor Ryan Sullivan where he studied how atmospheric transformations of volcanic ash can influence its ice nucleation activity. He joined the Abbatt and Mabury groups at U of T for his PhD in September 2021 to study aqueous and heterogeneous transformations of environmental contaminants.

Han Huynh

Han completed her Ph.D. in Chemical Engineering at Columbia University in August 2021 with Dr. V. Faye McNeill. For her graduate work, she studied calcite aerosol heterogeneous chemistry in the stratosphere and its impact on stratospheric ozone impact using both offline (FTIR) and online (CIMS) experimental techniques. The goal of her work was to evaluate the role of calcite aerosol as a candidate for solar radiation management (SRM). She joined the Abbatt group in December 2021 as a postdoctoral fellow. Her current research focuses on the surface characterization and chemistry of indoor surfaces, in particular the partitioning of VOCs/SVOCs from the use of disinfecting personal and household care products.

Spiro Jorga

Spiro completed his Ph.D. at Carnegie Mellon University in chemical engineering in May 2021. During his graduate studies he worked with Dr. Spyros Pandis where he improved a dual chamber system for ambient perturbation experiments studying the physical and chemical properties of ambient atmospheric aerosol. He joined the Abbatt group as postdoctoral fellow in August 2021. His current research focuses on halogen activation reactions in aerosol particles.

Carolyn Liu-Kang

Carolyn completed her B.Sc. in chemistry from Université de Montréal. During her undergraduate studies, she did some work involving the identification of a sediment sample using Raman spectroscopy, as well as the characterization of pesticides using HPLC. She joined the Abbatt group for her PhD graduate studies in September 2019 where her research will focus on the formation of nitrogenated BrC (brown carbon) compounds from biomass burning sources.

Laura-Helena Rivellini

Laura did her PhD as a collaboration between the SAGE department of Douai Engineering School and the Laboratory of Atmospheric Optics from Lille University (France). The aim was to link the chemical composition and optical properties of aerosols in West Africa (Senegal) by coupling on-line aerosol mass spectrometry with in situ and remote sensing instruments. In 2018, she pursued a post-doctoral research under the supervision of Dr. Alex K. Y. Lee at the National University of Singapore, by investigating carbonaceous aerosol sources and mixing state using a Soot-Particle aerosol mass spectrometer (SP-AMS). She joined the Abbatt group as postdoctoral fellow in July 2022 to study the chemical and optical properties of biomass burning emissions and their impact on outdoor / indoor air quality. 

Stephanie Schneider

Stephanie completed her B.Sc. at the University of Alberta in chemistry in June 2017. During her undergraduate studies, she worked with Dr. Sarah Styler to quantify the reactive oxygen species produced photochemically from both road dust and mineral dust. It was this project that got her interested in studying atmospheric chemistry, and she joined the Abbatt group in September 2017 for her PhD. Her current work focuses on the quantification of the organic compounds volatilizing from the sea-surface microlayer, and how those compounds interact with common oxidants in the atmosphere. 

Yutong (Maggie) Wang

Yutong received her H.B.Sc. in environmental chemistry from University of Toronto in June of 2020. During her undergraduate studies, she briefly worked on the quantification of isocyanate ion’s photo-oxidation rate using relative rate kinetics. Her undergraduate thesis involved using Ion Chromatography for isocyanate concentration determination. Yutong started her PhD in the Abbatt group in September 2020, where her research focuses on brown carbon and factors that may impact its optical properties. 

Kristen Yeh

Kristen received her B.Sc. in forensic science from Trent University in May of 2020. During her undergraduate studies, she briefly worked with Giardia intestinalis to investigate the localization of proteins during in vitro encystation. Her undergraduate thesis used MALDI FT-ICR-MSI to examine changes to fingerprint residues after implementing a cleaning process. Kristen started her PhD in the Abbatt group in September 2020, where her research focuses on heterogenous surface interactions of third-hand cannabis smoke indoors.

Jie Yu

Jie obtained her H.B.Sc. Degree in Chemistry at University of Toronto in April 2019. Her undergraduate research with Dr. Abbatt focused on heterogeneous chlorination of reduced nitrogen species using ATR-FTIR and DART-MS. She joined the Abbatt group again in September 2019 to pursue a PhD in Environmental Chemistry, with research focus on VOC partitioning in indoor surface reservoirs.

Zilin Zhou

 Zilin completed his B.Sc. in chemistry at the University of Ottawa in April 2017. His undergraduate research at the A.E. Lalonde AMS laboratory at uOttawa focused on the development of new analytical techniques for radium, plutonium and polonium measurements in environmental samples utilizing accelerator mass spectrometry (AMS). He joined the Abbatt group in summer 2017 for his PhD. His current and future research includes indoor air studies on the formation of Criegee biradicals resulting from the heterogeneous oxidation of unsaturated compounds (e.g. cooking oil) with ozone, with primary focuses on the kinetics and products. New analytical techniques for measuring complex triglycerides and oxygenated products using LC-MS will be developed in this project.

Past Group Members