International Society of Indoor Air Quality and Climate - Event Information

Event Name:Webinar: Modelling Infection Risk from Indoor Aerosol Exposure to SARS-CoV-2 (US-Europe Option)
Event Type(s):Webinar
Description:This two-part webinar series will provide a platform for developers to summarize their risk assessment tools so that they may be better understood and compared by potential users among the ISIAQ community. The panel format will facilitate exchange of information and ideas and encourage active participation by the audience in a technical dialogue. Identification of limitations and future areas for improvement will be discussed.

Summary: The COVID-19 pandemic has highlighted the urgent need for improved methods of risk assessment for airborne transmission of infectious disease in public and residential indoor spaces.  Such settings rely either on natural ventilation, which is often weather dependent, or on HVAC systems typically designed and operated for comfort rather than infection control.  In attempt to fill this need over the past several months, numerous quantitative tools have been developed by a variety of scientists and engineers to model the risk of indoor occupancy during the pandemic.  While these tools all incorporate ventilation as a primary control measure, they differ in their inclusion of epidemiological aspects, in how emission sources are represented, and in how risk is calculated based on a time-dependent exposure to infectious aerosols.  They also differ in terms of their platform, target users, and overall degree of technical complexity.

For these tools to be widely used and drive policy and/or regulatory change, they must be applicable to a diverse building stock, validated by real-world epidemiological studies, and apply the most up to date scientific knowledge of aerosol fate and transport and human infectivity.  They must also be easy to use and understand, contributing towards a broader understanding of “airborne transmission” and improved scientific consensus surrounding its importance in public, non-hospital settings.

Format: The webinar will be presented in two (2) groups to accommodate all time zones, and each webinar will be 2 hours in length.  Each webinar will begin with a pre-recorded video containing an introduction by Professor Morawska, followed by 5-minute presentations of each tool by the author(s) present at that webinar session.  This video will be approximately 35 minutes long and will be followed by a 30-minute discussion and Q&A period with the tool developers present at that session.  Following this discussion component, a second ~35 minute long video will be played containing 5-minute presentations from the developers who are not present at that particular session.  The webinar will then conclude with a second, 20-minute discussion and Q&A period, focusing on comparisons between the tools and recording questions for the developers in the other session.  A technical query sheet for each tool that summarizes key aspects will be posted on-line to the ISIAQ web page prior to the webinars.

Developers Present:
Co-Chairs: Professor Jose L. Jimenez, PhD, University of Colorado-Boulder
Alex Mikszewski, PE, The City University of New York Building Performance Lab
  1. COVID-19 Aerosol Transmission Estimator & Monte Carlo Version, Jose L. Jimenez
  2. Harvard-University of Colorado Boulder Portable Air Cleaner Calculator for Schools, Shelly Miller
  3. The SAFEAIRSPACES COVID-19 Aerosol Relative Risk Estimator, Hooman Parihizkar
  4. Indoor Aerosol Exposure-Infection Risk Modeling based on the Mollier Chart, Fahmi Yigit
  5. Work and Personal Predictors of COVID-19 Transmission Risk, Paul Anand
  6. Fate and Transport of Indoor Microbiological Aerosols (FaTIMA), Lisa Ng

Additional Developers:
  1. VUE COVID-19 Analyser, Brad Prezant
  2. Personal Relative COVID Risk Modelling Tool, Matti Jantunen
  3. COVID-19 Multi-rooms Calculator, Livio Mazzarella
  4. Air Exchange Estimator for Infective Aerosol Prevention, Detlef Hennings
  5. RESET Index: Real-time Aerosol Infection Estimator, Anjanette Green
  6. Indoor Scenario Simulator, Michael Riediker
Event Date:Wednesday December 2, 2020
Event Time:5pm UTC (Confirm local time at
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ISIAQ Modeling Infection Risk Webinars

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