Skip Navigation

Principal Investigators

Dr Evans    Dr. Greg Evans
Director, SOCAAR
Professor, Dept. of Chemical Engineering and Applied Science

(416) 978-1821



Dr. Greg J. Evans  obtained his B.A.Sc., M.A.Sc., and Ph. D. in Chemical Engineering from the University of Toronto. He is the co-Director, of Leaders of the Faculty’s leadership development program Leaders of Tomorrow. He teaches Environmental Chemistry, Physical and Inorganic Chemistry, and Nuclear Engineering.

Dr Evans’ research examines the source and composition of airborne particles, a key pollutant contributing to episodes of poor air quality in large cities. This research utilizes a combination of advanced instrumentation and modelling to understanding spatial and temporal trends in the concentration, composition and origins of these particles. The goal is to make key connections between emissions of pollutants, the quality and composition of urban air, and the impact of aerosols on human health and the environment. Focus areas include the development and application of high time resolution instruments in fieldwork, such as single particle mass spectrometry, the use of receptor modelling for sources identification and characterisation, and the exposure of urban populations to vehicle emissions.

Selected Publications

1. R.M. Healy, U. Sofowote, Y. Su, J. Debosz, M. Noble, C.-H. Jeong, J.M. Wang, N. Hilker, G.J. Evans, G. Doerksen, K. Jones, A. Munoz, "Ambient measurements and source apportionment of fossil fuel and biomass burning black carbon in Ontario" Atmospheric Environment 161, 34-47 (2017) [Online]

2. J.M. Wang, C.-H. Jeong, N. Zimmerman, R.M. Healy, N. Hilker, and G.J. Evans, "Real-World Emission of Particles from Vehicles: Volatility and the Effects of Ambient Temperature" Environmental Science & Technology 51 (7), 4081-4090 (2017) [Online]

3. C.-H. Jeong, A. Traub, G.J. Evans, "Exposure to ultrafine particles and black carbon in diesel-powered commuter trains", Atmospheric Environment 155, 46-52 (2017) [Online]

4. M.L. North, J.R. Brook, E.Y. Lee, V. Omana, N.M. Daniel, L.M. Steacy, G.J. Evans, M.L. Diamond, A.K. Ellis, "The Kingston Allergy Birth Cohort: Exploring parentally reported respiratory outcomes through the lens of the exposome", Annals of Allergy, Asthma & Immunology 118, (4), 465-473 (2017) [Online]

5. David S. Josey, Stephanie R. Nyikos, Richard K. Garner, Aleksa Dovijarski, Jeffrey S. Castrucci, Jonathan M. Wang, Greg J. Evans, and Timothy P. Bender, "Outdoor Performance and Stability of Boron Subphthalocyanines Applied as Electron Acceptors in Fullerene-Free Organic Photovoltaics," ACS Energy Letters 2 (3), 726-732 (2017) [Online]

6. K.V. Ryswyk, A.T. Anastasopolos, G. Evans, L. Sun, K. Sabaliauskas, R. Kulka, L. Wallace, and S. Weichenthal, "Metro Commuter Exposures to Particulate Air Pollution and PM2.5-Associated Elements in Three Canadian Cities: The Urban Transportation Exposure Study," Environmental Science & Technology Article DOI: 10.1021/acs.est.6b05775 (2017) [Online]

Prof. Jon Abbatt   

Dr. Jon Abbatt
Professor, Dept. of Chemistry

(416) 946-7358

Dr. Jonathan Abbatt is an atmospheric chemist interested in the various roles that sub-micron-sized particles play in the atmosphere. He obtained his BSc from the University of Toronto in 1984, and then spent 16 years in the United States as a PhD student at Harvard (Supervisor, Jim Anderson, Thesis Topic: Free-Radical Gas-Phase Kinetics), Postdoctoral studies at MIT (Supervisor, Mario Molina, Topic: Ozone Hole Heterogeneous Chemistry) and faculty member at the University of Chicago (Assistant and Associate Professor). He chose to return to Canada in 2000 where he joined the Department of Chemistry in the University of Toronto.

Dr. Abbatt has a number of research interests, including studies of atmospheric aerosol properties and composition, gas-particle chemistry, and the roles that particles play in the formation of both liquid water and ice clouds. Areas of interest extend from the urban setting where particles are known to have impacts on human health, to the regional and global scale where particles constitute an important component of the climate system. Studies are performed both in the laboratory and the field, using a combination of specialized in-lab-built and commercial state-of-the-art equipment. Prof. Abbatt has served on the editorial boards of Atmospheric Chemistry and Physics, and the Journal of Geophysical Research - Atmospheres. He is the recipient of a Premier’s Research Excellence Award and a New Opportunities Award from the Canada Foundation for Innovation, and he is also an Associate Director for University of Toronto’s Centre for Global Change Science.

Selected Publications

1. Abbatt, J.P.D.; Thomas, J.L.; Abrahamsson, K.; Boxe, C.; Granfors, A.; Jones, A.E.; King, M.D.; Saiz-Lopez, A.; Shepson, P.B.; Sodeau, J.; Toohey, D.W.; Toubin, C.; von Glasow, R.; Wren, S.N.; Yang, X. Halogen Activation via Interactions with Environmental Ice and Snow in the Polar Lower Troposphere and Other Regions. Atmos. Chem. Phys., 2012, 12, 6237-6271. [online]

2. Abbatt, J.P.D.; Lee, A.K.Y.; Thornton, J.A. Quantifying Trace Gas Uptake to Tropospheric Aerosol: Recent Advances and Remaining Challenges. Chem. Soc. Rev. 2012, 4, 6555 – 6581. [online]

3. Lee, A. K. Y.; Hayden, K.L.; Herckes, P.; Leaitch, W. R.; Liggio, J.; Macdonald, A. M.; Abbatt, J.P.D. Characterization of Aerosol and Cloud Water at a Mountain Site During WACS 2010: Secondary Organic Aerosol Formation Through Oxidative Cloud Processing. Atmos. Chem. Phys. 2012, 12, 7103-7116. [online]

4. McWhinney, R.D.; Gao, S.S.; Zhou, S.; Abbatt, J.P.D. Evaluation of the Effects of Ozone Oxidation on Redox Cycling Activity of Two-Stroke Engine Exhaust Particles. Environ. Sci. Tech. 2011, 45, 291-295.

5. George, I.J.; Abbatt, J.P.D. Heterogeneous Oxidation of Atmospheric Aerosol Particles by Gas-Phase Free Radicals. Nat. Chem. 2010, 2, 713-722. [online]


Dr. Edgar J. Acosta  
Associate Professor, Depart. of Chemical Engineering and Applied Chemistry, University of Toronto

(416) 946-0742

Edgar J. Acosta received his B.Sc. in Chemical Engineering (Summa Cum Laude) from the Universidad del Zulia (Venezuela) in 1996, and his M.Sc. and Ph.D. in Chemical Engineering from the University of Oklahoma in 2000 and 2004, respectively. He is currently an Associate Professor at the Department of Chemical Engineering and Applied Chemistry of the University of Toronto. Dr. Acosta received the Provost Dissertation Award from the University of Oklahoma (2005), the Akzo-Nobel “Ralph Potts” award (2002), and the AOCS S&D best paper award (2004 and 2008), the AOCS Young Scientist Award (2010). Dr. Acosta has published over 50 research articles, 5 book chapters, 2 patent applications, and has been author or coauthor of over 80 presentations at international conferences.

Dr. Acosta’s research involves the study of interactions and forces at interfaces, and more specifically, the use of surface active agents (surfactants) to modify those forces. One of those interfaces is the air-liquid interface of the alveoli. At this interface, lung surfactants (mixture of lipids and proteins secreted by the alveolar tissue) reduce the surface tension of the interface, preventing the collapse of the lungs upon exhalation and maintaining a large interfacial area for gas exchange. These lung surfactants are one of the gates that air pollutants need to pass in order to enter the body. We seek to understand the role of lung surfactants on the transport of these pollutants and the potential effects that lung pollutants might have on the behavior of lung surfactants. This understanding might help us assess risks of poor respiratory compliance for healthy and at-risk individuals for different exposure events.

head shot     Dr. Jeffrey Brook
Senior Scientist, Environment Canada

(416) 739-4916
Dr. Jeffrey R. Brook, B.S., Dip. Met., M.S., Ph.D., is a senior scientist at Environment Canada in Toronto, Ontario, and adjunct professors in the Depts. of Public Health Sciences and Chemical Engineering at the University of Toronto. Dr. Brook is an Associate Editor for the Journal of the Air&Waste Management Association and on the editorial board of the Journal Atmospheric and Air Quality Research. He currently serves on the research management committee for AllerGen, which is a Canadian National Centre of Excellence focusing on asthma, allergy, genes and the environment.

Dr. Brook began his career as a meteorologist before undertaking graduate work at The University of Michigan. Dr. Brook conducts original research in air pollutant deposition and urban/regional air quality, emphasizing fine particulate matter, ambient measurement, and exposure assessment in support of a wide range of health-effect study designs. This latter research involves the interface between air pollutant characterization, with source-receptor analysis, and toxicological, clinical and both retrospective and prospective epidemiological studies. 

Arthur Chan   

Dr. Arthur Chan
Assistant Professor,
Dept. of Chemical Engineering and Applied Chemistry

Dr. Arthur Chan received his B.S. degree in Chemical and Biomolecular Engineering from University of Pennsylvania in 2005, and his Ph.D. degree in Chemical Engineering from California Institute of Technology in 2010. He is currently a postdoctoral researcher at University of California, Berkeley, and will be joining the Department of Chemical Engineering and Applied Chemistry at University of Toronto in April 2013.

Dr. Chan’s research focuses on investigating the sources and processing of organic compounds in the atmosphere through detailed chemical characterization. Major topics include developing analytical techniques to speciate complex organic mixtures, studying detailed organic composition of emission sources, such as motor vehicles and forest fires, and investigating oxidation pathways of organic compounds to form aerosol. The goals of these field and laboratory studies are to understand the precursors and the formation pathways of atmospheric organic aerosol, and to provide essential constraints for atmospheric modeling and design of effective mitigation strategies.


Dr. Chung-Wai Chow  
Clinicial Scientist, Assistant Professor,
Division of Respirology, Dept. of Medicine
(416) 946-0092

Dr. Chow completed medical school at the University of Toronto, where she complete clinical training in General Internal Medical and Adult Respiratory Medicine. She pursued graduate studies in Cell Biology under the mentorship of Dr. Sergio Grinstein at the Hospital for Sick Children, University of Toronto and obtained her PhD in 1999. She did post-doctoral training at the Max Planck Institute in Germany as an Alexander von Humboldt fellow and with Dr. Gregory Downey at the University of Toronto. Dr. Chow is currently appointed as Clinician-Scientist, Assistant Professor in the Multi-Organ Transplant Programme, Division of Respirology, Department of Medicine. She divides her time between a clinical focus in lung transplantation, and research in the basic mechanisms that regulate airway inflammation and remodeling with a specific interest in the role of the Syk tyrosine kinase in the airway epithelia.

There are two major themes of research in Dr. Chow’s laboratory. The first is focused on underlying the role and regulation of Syk mediating airway inflammation following exposure to human rhinovirus (the most common cause of acute infections in humans and the cause of the common cold) and in response to environmental air pollution. The second theme focuses on the role of Syk in modulating tissue repair and airway remodeling, a common feature in chronic lung diseases such as asthma, chronic obstructive lung disease and graft rejection following lung transplantation.

Research is carried out in vitro using mono- and co-cultures of airway epithelial and airway smooth muscle cells, and in vivo using several animal models of allergen-induced asthma and real-time exposure to environmental airway pollution.

Selected Publications

1. Castellanos Penton P; Wang, X.; Amatullah, H.; Cooper, J.; Godri, K.; North, M.L.; Khanna, N.; Scott, J.A.; Chow, C.W. Spleen tyrosine kinase inhibition attenuates airway hyperresponsiveness and pollution-induced enhanced airway response in a chronic mouse model of asthma. J Allergy Clin Immunol. [Online early access]. DOI:pii: S0091-6749(12)01255-9. 10.1016/j.jaci.2012.07.039. Published Online: Sept 13, 2012. [online]

2. Amatullah, H.; North, M.L.; Akhtar, U.S.; Rastogi, N.; Urch, B.; Silverman, F.S.; Chow, C.W.; Evans, G.J.; Scott. J.A. Comparative cardiopulmonary effects of size-fractionated airborne particulate matter. Inhal. Toxicol. 2012, 24 (3),161-71. [online]

3. Wang, X.; Mychajlowycz, M.; Lau, C.; Gutierrez, C.; Scott, J.A.; Chow, C.W. Spleen Tyrosine kinase mediates BEAS-2B cell migration and proliferation and human rhinovirus-induced expression of vascular endothelial growth factor and interleukin-8. J. Pharmacol. Exp. Ther. 2012, 340 (2), 277-85. [online]


Dr. Miriam Diamond
Professor, Dept of Earth Sciences
(416) 978-1586

Miriam Diamond, B.Sc., M.Sc., M.Sc.Eng., Ph.D. is a Full Professor in the Department of Earth Sciences and School of the Environment. Miriam is involved with University governance as the Vice-Chair of the Planning and Budget Committee of Academic Board, member of the University's tribunal and as a tenure assessor. She is a member of the Science Advisory Board of the International Joint Commission, the editorial advisory board of Environmental Science and Technology, and a member of several committees in the United States.

Miriam's interests focus on chemical contaminants from source through to environmental behaviour, and ecosystem and human exposure. The chemicals of interest include persistent and pseudo-persistent organic compounds such as PCBs, brominated flame retardants and phthalates, and metals. Her research group looks at these chemicals by measuring their concentrations in the environment (outdoors and indoors) and mathematically modelling their fate. Their studies take multi-media (air, water, soil, etc.) and multidisciplinary perspectives (science and policy).

Selected Publications

1. ABBASI G*, A SAINI*, E GOOSEY+, ML DIAMOND. 2016. Product screening for sources of halogenated flame retardants in Canadian house and office dust. Sci Total Environ. 545-546: 299-307.

2. ZHANG X, R SŰHRING+, D SERODIO*, M BONNELL, N SUNDIN, ML DIAMOND. 2015. Novel flame retardants: estimating the physical-chemical properties and environmental fate of 94 halogenated and organophosphate PBDE replacements. Chemosphere. 144: 2401-2407. 10.1016/j.chemosphere.2015.11.017

3. BLUM, A, SA BALAN, M SCHERINGER, X TRIER, G GOLDENMAN, IT COUSINS, M DIAMOND, T FLETCHER, C HIGGINS AE LINDEMAN, G PEASLEE, P DE VOOGT, ZY WANG, R WEBER. 2015. The Madrid statement on poly- and perfluoroalkyl substances (PFASs). Environ Health Persp 123(5): A107-A111.

4. SAINI A*, JO OKEME*, E GOOSEY+, ML DIAMOND. 2015. Calibration of two passive air samplers for monitoring phthalates and halogenated flame retardants in indoor air. Chemosphere 137:166-173.

5. MELYMUK L, GOOSEY E+, N RIDDELL, ML DIAMOND. 2015. Interlaboratory study of novel halogenated flame retardants: InterFLab. Analytical Bioanalytical Chem 407(22): 6759-6769. DOI: 10.1007/s00216-015-8843-7

6. DIAMOND ML, CA DE WIT, S MOLANDER, M SCHERINGER, T BACKHAUS, R LOHMANN, R ARVIDSSON, Å BERGMAN, M HAUSCHILD, I HOLOUBEK, L PERSSON, B SUZUKI, M VIGHI, C ZETZSCH. 2015. Exploring the planetary boundary for chemical pollution. Environment International 78:8-15. DOI: 10.1016/j.envint.2015.02.001

7. ABBASI G*, AM BUSER, A SOEHL, M MURRAY, ML DIAMOND. 2015. Stocks and flows of PBDEs from use to waste in U.S. and Canada from 1970-2020. Environ Sci Technol 49(3): 1521-1528. DOI: 10.1021/es504007v


Dr. Marianne Hatzopoulou
Associate Professor, Depart. of Civil Engineering
(416) 978-0864

Dr Hatzopoulou holds degrees in environmental technology and physics from the American University of Beirut. She completed her PhD in Urban Transportation Planning at the University of Toronto in 2008 and did postdoctoral work at the Massachusetts Institute of Technology. Her expertise is in modelling road transport emissions and urban air quality as well as evaluating population exposure to air pollution. She has conducted monitoring campaigns to study individuals’ exposure to air pollution and investigated potential determinants of exposure including meteorological effects, road geometry, the types of built environments, and traffic composition. She works closely with epidemiologists in the development of improved measures for air pollution exposure and has received funding from federal and provincial health agencies to conduct integrative research in transportation, air pollution, and public health.

Selected Publications

1. Farrell, W., Deville-Cavellin, L., Weichenthal, S., Goldberg, M., Hatzopoulou, M. 2015. Capturing the urban canyon effect on particle number concentrations across a large road network using spatial analysis tools. Building and Environment, 92: 328-334. [online]

2. Shekkarrizfard, M., Shamsunnahar, Y., Valois, M.F., Goldberg, M., Crouse, D., Ross, N., Parent, M.E., Hatzopoulou, M. 2015. Investigating the role of transport models in epidemiologic studies of traffic related air pollution and health effects. Environmental Research, 140: 282-295. [online]

3. Ghafghazi, G. and Hatzopoulou, M. 2015. Simulating the air quality impacts of traffic calming schemes in a dense urban neighbourhood. Transportation Research Part D, 35: 11-22.[online]

4. Alam, A. and Hatzopoulou, M. 2014. Reducing transit bus emissions: Alternative fuels or traffic operations? Atmospheric Environment, 89: 129-139.[online]

jia   Dr. Charles. Q. Jia
Professor, Depart. of Chemical Engineering and Applied Chemistry, University of Toronto
(416) 946-3097
Dr. Charles Q. Jia directs the research in the Green Technology Lab where sciences and engineering principles are applied to solve environmental problems and challenges in sustainable energy. With projects addressing global issues such as clean air, clean water and climate change, efforts in his lab are devoted to developing new technologies that minimize or eliminate industrial emissions and maximize values of natural resources, and to understanding the fate, transport and impacts of pollutants, such as aerosols, in the natural environment. Novel technologies developed include the SOactive process for capturing sulfur dioxide-a precursor of sulfate aerosol, from industrial flue gases, and generating sulfurized nano-porous carbons for air and water purification. In collaboration with Environment Canada, the Green Technology Lab has contributed to the development of a new supercomputer-based tool for a more accurate assessment of the effect of aerosols on climate change. Recently, a systematic study has been carried out to investigate the transport of climate-affecting aerosols (black carbon and sulphate) to the Arctic, which helps devise strategies to deal with the challenge of global warming. At present, the research effort is being devoted to elucidate the fate and transport of motor vehicle-derived aerosols with mathematical models. Dr Jia teaches 2nd, 4th-year and graduate-level courses and enjoys cycling and playing badminton outside classroom and lab.

Selected Publications

1. Huang, L.; Gong, S.L.; Jia, C.Q.; D. Lavoué. Relative contributions of anthropogenic emissions to black carbon aerosol in the Arctic. J. Geophys. Res. 2010, 115, D19208. [online]

2. Huang, L.; Gong, S.L.; Jia, C.Q. Importance of deposition processes in simulating the seasonality of the Arctic black carbon aerosol. J. Geophys. Res.2010, 115, D17207. [online]

3. Huang, L.; Gong, S.L.; Sharm, S.; Lavoué, D.; Jia, C.Q. A trajectory analysis of atmospheric transport of black carbon aerosols to Canadian High Arctic in winter and spring (1990-2005). Atmos. Chem. Phys., 2010, 10 (11), 5065-5073. [online]

jennifer murphy     Dr. Jennifer Murphy
Associate Professor, Dept. of Chemistry
(416) 946-0260
Dr. Jennifer Murphy received a BSc in Chemistry from McGill University in 2000 and a PhD in Chemistry from the University of California, Berkeley in 2005. After a postdoctoral position at the School for Environmental Studies at the University of East Anglia, she began a faculty appointment in the Department of Chemistry at the University of Toronto in 2007. She holds a Canada Research Chair in Atmospheric and Environmental Chemistry and is a member of the graduate faculty of the Centre for Environment. She serves on the editorial board of Atmospheric Chemistry and Physics and teaches an upper level course in Atmospheric Chemistry.

Dr Murphy’s research focuses on field studies, in which state-of-the-art instrumentation is deployed to various locations to make in situ measurements of atmospheric constituents. These observations can be used to understand the emissions, chemical and physical processing and deposition of gaseous and aerosol pollutants in the atmosphere. An important research goal is to develop techniques to make accurate measurements of aerosol chemical speciation in the urban and remote atmosphere.

Jeremy     Dr. Jeremy A. Scott Assistant Professor of Medicine
Dr. Jeremy A. Scott received his BSc, MSc, and PhD in Pharmacology & Toxicology the University of Western Ontario. Following a post-doctoral fellowship at the University of Toronto, Dr. Scott joined the Faculty of Medicine in 2004, and is cross-appointed with the Division of Occupational Medicine and the Gage Occupational and Environmental Health Unit at St. Michael’s Hospital.

Dr. Scott’s research interests are focused on the mechanisms related to the airways hyperresponsiveness and remodeling in asthma, and the effects of occupational and environmental pollutants on the airways. Specific investigations are examining the role of L-arginine metabolism in airway responsiveness, the role of hematopoietic cell populations in pollution-induced exacerbation of pulmonary symptoms, and the effect of routes of exposure to allergens on the subsequent development of sensitization/tolerance.

Selected Publications

1. Akhtar, U. McWhinney, R.;Rastogi, N.; Abbatt, J.; Evans, G.J.; Scott, J.A. Cytotoxic and pro-inflammatory effects of ambient and source-related particulate matter (PM) in relation to the production of reactive oxygen species (ROS) and cytokine adsorption by particles. Inhal Toxicol. 2010, 22 (S2), 37–47. [online]

2. North, M.L.; Amatullah, H.; Khanna, N; Urch, B.; Grasemann, H.; Silverman, F.S.; Scott, J.A. Induction of arginase by exposure to air pollution exacerbates the airways symptoms in murine models of asthma. Respir Res. 2011, 12, No.19. [online]

3. Amatullah, H.; North, M.L.; Akhtar, U.S.; Rastogi, N.; Urch, B.; Silverman, F.S.; Chow, C.W.; Evans, G.J.; Scott J.A. Comparative cardiopulmonary effects of size-fractionated airborne particulate matter. Inhal Toxicol. 2012, 24 (3), 161–171. [online]

4. Rastogi, N.; McWhinney, R.D.; Akhtar, U.S.; Urch, B.; Fila, M.; Abbatt, J.P.D.; Scott, J.A.; Silverman, F.S.; Brook, J.R.; Evans, G.J. Physical characterization of a coarse, fine, and ultrafine high-volume particle concentrator system. Aerosol. Sci. Tech. 2012, 46,1015–1024.[online]

5. Castellanos Penton P.; North, M.L.; Amatullah, H.; Khanna, N.; Wang, X.; Scott, J.A.; Chow, C.W. Syk inhibition attenuates airway hyperresponsiveness and pollution-induced enhanced airway response in a chronic murine model of asthma. J Allergy Clin Immunol. [Online early access]. DOI: 10.1016/j.jaci.2012.07.039. Published Online: Sept 17, 2012. [online]

Jeffrey Siegel     Dr. Jeffrey Siegel
Associate Professor,
Dept. of Civil Engineering
(416) 978-7975
Dr. Jeffrey Siegel received his B.S. in engineering from Swarthmore College, and his M.S. and Ph.D. in mechanical engineering from UC Berkeley in 2002. He taught from 2002-2012 in the Department of Civil, Architectural, and Environmental Engineering at the University of Texas at Austin and in 2013 he chose to return to his native Toronto. His research broadly examines indoor air quality and especially the connections between indoor contaminant concentrations and air cleaning, ventilation, HVAC systems, building properties, and building energy use. Much of his aerosol-related research focuses on the primary and secondary consequences of particle filtration, as well as on the transport and deposition of indoor particles. Dr. Siegel and his research team use a wide variety of state-of-the-art field and laboratory instrumentation, including techniques for sampling, extracting and sequencing the DNA of indoor dust. He has active research projects on ventilation and indoor air quality in retail stores, passive and low energy air cleaning, the indoor microbiome, secondary organic aerosols, energy implications of filtration, and the use of HVAC filters as passive samplers for particulate contaminants.

Selected Publications

1. Stephens, B.R.; Siegel, J.A. Penetration of ambient submicron particles into single-family residences: associations with building characteristics. Indoor Air. 2012, 22, 501–513. [online]

2. Stephens, B.R.; Siegel, J.A. Comparison of test methods for determining particle removal efficiency of filters in residential and light-commercial central HVAC systems. Aerosol Sci. Tech. 2012, 46, 504-513. [online]

3. Waring, M.S.; Siegel, J.A. Indoor air quality implications of using ion generators in residences. Indoor Air. 2011, 21, 267-276. [online]

4. Noris, F.; Siegel, J.A.; Kinney, K.A. Evaluation of HVAC filters as a sampling mechanism for indoor microbial communities. Atmos. Environ. 2011, 45, 338-346. [online]

5. Mukai, C.; Siegel, J.A.; Novoselac, A. Impact of airflow characteristics on particle resuspension from indoor surfaces. Aerosol Sci. Tech. 2009, 43, 1022-1032. [online]  

Dr. Frances Silverman
Director Research, Gage Occupational and Environmental Health Unit
Associate Professor of Medicine

(416) 978-5883
Dr. Frances Silverman, Associate Professor of Medicine, Director Research, Gage Occupational and Environmental Health Unit, at the University of Toronto and St. Michael's Hospital, received her PhD from McGill University and has 30 years experience in inter-disciplinary research on health effects of air pollutants and the role they play in the development of inflammation and disease. She is recognized internationally for her innovative work on controlled human environmental chamber (clinical) studies. She has published numerous peer-reviewed articles, reports, serves on professional committees, speaks at national and international meetings. She serves as a reviewer for scientific journals and for granting agencies. Her work has led to recognition in the scientific literature, by the United States and Canadian Governments as well as other organizations. She is a research leader in AllerGen NCE, a member of Southern Ontario Centre for Atmospheric Aerosol Research(SOCAAR), and a principal investigator at the Harvard EPA Funded PM Centre.She also acts in an advisory capacity to government e.g. the Health Canada, Environment Canada, and the US Environmental Protection Agency. She developed and was Director of the Collaborative Program in Environment and Health at the University of Toronto, taught several courses and trains graduate students and research fellows.

Prof. Jim Wallace    Dr. Jim Wallace
Professor, Department of Mechanical & Industrial Engineering

(416) 978-4899
Dr. Jim Wallace obtained his BSME and AB degrees from Lehigh University and his Masters and PhD degrees in Mechanical Engineering from the University of Michigan. He teaches Thermal Energy Conversion, Alternative Energy Systems and Combustion Engine Processes.

Dr. Wallace’s research examines the generation of gaseous and particulate exhaust emissions in combustion engines, as well as the control of those emissions using exhaust aftertreatment devices such as catalytic converters, diesel oxidation catalysts, diesel particulate filters, and selective catalytic reduction (SCR) systems. The research has a strong focus on the use of alternative fuels as a means of reducing exhaust emissions. Current research ranges from fundamental ignition studies of natural gas injected in diesel engines to more applied projects examining how biodiesel fuel use affects the operation of diesel particulate filters. Fuels under investigation for spark ignition engines include ethanol-gasoline blends, biogas and hydrogen. The research is facilitated by the outstanding experimental facilities and instrumentation available in the Engine Research and Development Laboratory.