Event Details

PHO Rounds: Indoor Air Quality and COVID-19

This webinar intends to provide an evidence-based discussion on current COVID-19 transmission knowledge and how it relates to buildings and Heating, Ventilation, and Air Conditioning (HVAC) systems. There is a particular focus on the opportunities to reduce transmission risk and to connect research evidence to practical guidance. The first portion of the webinar explores the main transmission routes for the SARS-CoV-2 virus and their interaction with HVAC systems. The second portion provides practical guidance on using HVAC strategies to reduce transmission risk while focusing on the context for these measures and why the same general approach (e.g., a high-efficiency filter) can lead to varying impact and transmission across different buildings. The third portion of the webinar addresses specific technologies utilized in buildings; including unipolar and bipolar ionization, hydroxyl radicals, ultraviolet irradiation, photocatalytic oxidation, and plasma air cleaning, to inform guidance on such techonology use. 

The objectives of the webinar are to: 

  1. Describe basic building HVAC systems and their role in COVID-19 transmission risk
  2. List the factors that impact the efficacy of filtration and ventilation strategies
  3. Critically evaluate marketing claims about air cleaning technologies to inform decision-making and technology selection

Presenter(s): Jeffrey Siegel

Jeffrey Siegel, Ph.D., is a Professor of Civil and Mineral Engineering at the University of Toronto, a fellow of ASHRAE and a member of the Academy of Fellows of the International Society for Indoor Air and Climate (ISIAQ). He holds joint appointments at the Dalla Lana School of Public Health and the Department of Physical & Environmental Sciences. He is internationally recognized for his general work on indoor air quality and specific work on air cleaning. 


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.


Public Health Ontario Rounds are 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 (RCPSC). In order to receive written documentation for Continuing Medical Education (CME) credits, please check “Yes” beside the question “Do you require CME credits?” on the registration form.

College of Family Physicians of Canada (CFPC) Affiliate Members may count RCPSC credits toward their Mainpro+ credit requirements. All other CFPC members may claim up to 50 Certified credits per cycle for participation in RCPSC MOC Section 1 accredited activities.

PHO Rounds are also approved by the Council of Professional Experience for professional development hours (PDHs) for members of the Canadian Institute of Public Health Inspectors (CIPHI).

For more information or for a record of registration for other Continuing Education purposes, please contact events@oahpp.ca


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 events@oahpp.ca.

Chat icon

Contact Events



Updated 24 March 2021