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OEH Seminar: Exposure to Ultrafine Particles and Black Carbon in Diesel-Powered Commuter Trains
Friday, November 10, 2017 12:30 pm to 01:30 pm
Venue: University of Toronto, Gage Building, Room 108, 223 College Street (enter off Ross Street)
Environmental and Occupational Health
City: Toronto
Type: Seminar
Format: In Person; Webinar

Please note: This is an open invitation and may be forwarded to interested parties. 

A wide range of adverse health outcomes are associated with diesel exhaust. We collected measurements inside commuter trains and inter-city diesel trains to determine the concentration of ultrafine particles (UFP), lung deposited surface area (LDSA), and black carbon (BC) in air. Walking measurements were taken on the sidewalks of busy streets in downtown Toronto.
Under certain conditions, diesel-powered passenger trains had elevated concentrations of UFP, BC, and LDSA. When the passenger coaches were pulled by a locomotive, UFP, LDSA, and BC were 18, 10, and 6 times higher, respectively, than the exposure levels when the locomotive pushed the coaches. Exposure to these pollutants was most elevated in the coach located closest to the locomotive. The pollutant concentrations in pull-trains were substantially higher than those measured while walking on city sidewalks and other commuter options reported in the literature. Additional measurements of gaseous pollutants, particulate matter, and trace metals were conducted.

Presenter: Dr.  Cheol-Heon Jeong

Cheol Jeong is a senior research associate in Southern Ontario Centre for Atmospheric Aerosol Research (SOCAAR) at the University of Toronto. He completed his Ph.D. in Civil and Environmental Engineering from Clarkson University, New York, USA. His research interests primarily involve physicochemical characterization of airborne particles, source identification of air pollution using a combination of advanced instruments and modeling, spatial variations of traffic-related air pollution near roadways, and personal exposure to traffic emissions in urban microenvironments. 

The Occupational and Environmental Health Seminar Series is a self-approved group learning activity (Section 1) as defined by the Maintenance of Certification program of The Royal College of Physicians and Surgeons of Canada. The series is also approved by Council of Professional Experience for professional development hours (PDHs) for members of the Canadian Institute of Public Health Inspectors (CIPHI), and by the Canadian Registration Board of Occupational Hygienists (CRBOH) for Registration Maintenance (RM) points. For more information, please contact Elaina MacIntyre (
DISCLAIMER: The opinions expressed by speakers and moderators do not necessarily reflect the official policies or views of Public Health Ontario, nor does the mention of trade names, commercial practices, or organizations imply endorsement by Public Health Ontario.


Stay up to date on upcoming Occupational and Environmental Health Seminars by visiting our schedule. For comments or questions about this series, please email Elaina MacIntyre (

Public Health Ontario is committed to complying with the Accessibility for Ontarians with Disabilities Act (AODA). If you require accommodations to participate in this event, please contact 647-260-7100 or

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Page updated on [date/time] 2017-11-01 1:51 PM
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