Seminar talk by Dr. Arthur Chan

An upcoming seminar talk:

Airway Hypersensitivity Induced by Exposure to Organic Aerosol

by Dr. Arthur Chan

Assistant Professor, Department of Chemical Engineering and Applied Chemistry, University of Toronto

Host: Dr. Allan Bertram, Chemistry & Dr. Chris Carlsten, SPPH

Date: Tuesday, March 8th, 3:30-4:30pm

Location: Room D215, Chemistry Building, 2036 Main Mall


Epidemiologic studies have shown that particulate matter (PM) is associated with the incidence, morbidity and mortality of cardiopulmonary diseases. PM is mostly comprised of Secondary Organic Aerosols (SOA), formed through secondary reactions in the atmosphere. Here we study the in vivo pulmonary effects on mice exposed to lab-generated SOA. Healthy 8-10 weeks old female mice were exposed for 1 hr/day for 3 consecutive days to SOA from naphthalene oxidation (N-SOA), maintained at levels to simulate street-level concentrations during exposures. Pulmonary function and methacholine (MCh)- responsiveness were assessed 24 hours after the final exposure. After exposure to N-SOA, significant increases in total respiratory resistance were observed when compared to control filtered-air mice, and in a dose-dependent manner. However, the total and differential leukocyte counts in the broncho-alveolar lavage fluid were similar in all experimental groups, suggesting that increase in airway responsiveness was not associated with airway inflammation and may be triggered by non-inflammatory pathways.


Dr. Arthur Chan has been an Assistant Professor in Chemical Engineering and Applied Chemistry at University of Toronto since 2013. His research focuses on the sources, transformations and impacts of organic aerosol in the atmosphere. Arthur Chan received his Ph.D. in 2010 from Caltech studying the oxidation chemistry of organic compounds leading to SOA formation, and completed his postdoctoral work developing analytical techniques for atmospheric organic mixtures. 


(Last updated: March 2nd, 2016)



Seminar talk by Dr. Andrew Grieshop

From the kitchen to the clouds: towards an improved understanding of biomass cookstove emissions and their atmospheric aging

by Dr. Andrew Grieshop

Assistant Professor, Dept. of Civil, Construction and Environmental Engineering, North Carolina State University

Host: Dr. Milind Kandlikar, IRES

Date: Thursday, March 24th – 3-4 pm

Location: Case room, Liu Institute for Global Issues, 6476 NW Marine Drive


Roughly 40% of the world’s population cooks over rudimentary biomass fires that emit gaseous and particulate species with enormous public health and climate impacts. The potential to mitigate these impacts has spurred numerous large- and small-scale efforts to introduce alternative technologies, ostensibly with reduced emissions and impacts. This talk will provide an overview of research activities in my group to improve the understanding of the ‘lifecycle’ of aerosol emissions from cookstoves. Our experimental work examines the performance of both baseline and alternative technologies and helps build a better understanding of how emissions photochemically ‘age’ in the atmosphere. In-home emission tests completed in India and Malawi reveal that alternative stove designs neither deliver the emission reductions desired nor those observed during laboratory tests. The activity levels and aerosol emission rates, characteristics, and optical properties associated with in-field stove use are distinct from those from standard laboratory Water Boiling Tests (WBTs). We are leveraging the large field emission dataset to develop a lab testing protocol that better represents real-world cooking activity and emissions. However, factors beyond activity alone (e.g. fuel characteristics) have important influence on emissions, highlighting the continued need for field testing. Another thread of research indicates that atmospheric aging can dramatically change the mass and chemical composition of organic aerosols from biomass combustion emissions. Ongoing laboratory experiments with a ‘smog chamber’ and a newly developed, field-portable oxidation flow reactor allow us to simulate the aging of emissions over days to weeks under various oxidant conditions. Preliminary data show that aging can enhance organic aerosol concentrations by several-fold, with important implications for the regional air quality and climate impacts of current and proposed future combustion systems. Future work will combine these efforts to accurately represent emissions and aging conditions in both laboratory and field settings.

Dr. Andy Grieshop has been an Assistant Professor in the Department of Civil, Construction and Environmental Engineering, North Carolina State University (NCSU) since January, 2012. Dr. Grieshop’s research focuses on interactions between energy use and the environment, and more specifically on improving our technical understanding of the emission and atmospheric transformations of air pollutants. This work aims to inform effective policies to improve air quality and mitigate climate impacts in both developed and developing countries. Ongoing research includes a collaborative project to quantify the emission, indoor concentration, and health and climate impacts of two cookstove replacement programs in rural India, field measurements to characterize evolution of vehicle emissions in a near-road environment and lab and field measurements of the volatility of organic aerosols. His work integrates laboratory and field based experimentation with modeling and policy analysis efforts to address environmental problems. He teaches Environmental Engineering courses at the graduate and undergraduate levels and is the Faculty Advisor for the NCSU Chapter of Engineers Without Borders. Dr. Grieshop received his BS in Mechanical Engineering from UC Berkeley and his MS in Mechanical Engineering and PhD in Mechanical Engineering and Engineering and Public Policy from Carnegie Mellon University. Before joining NC State he was a Postdoctoral Research Fellow at the University of British Columbia.



CREATE-AAP student Erin Evoy wins Robert Caton Scholarship

Congratulations to Erin for the 2015 Robert Caton Scholarship.

Erin receiving her award last week


CREATE-AAP 2016 Symposium Slides


CREATE-AAP 2016 Symposium Schedule

Below is the symposium schedule (revised Feb 3rd, 2016).

Download the full program here.