Embedded Files
[1] Web Links and Educational Resources:
Google sheet:
Prof. Huffman is curating an open (Google sheet) website with information about the airborne spread of SARS-CoV-2, which causes COVID-19. Click on the button below the sheet to go directly to the full spreadsheet.
Educational presentations & slide decks:
Prof. Huffman recently prepared some educational materials and given presentations on the airborne spread of SARS-CoV-2. A summary and links shown here.
Modules for the Univ. Denver "Pathway Back to Campus" online course required for all students, staff, and faculty. Those files will be posted here soon.
Seminar to Physics & Astronomy Department at the University of Denver; 10/28/2020
Presentation title: "Viral Aerosol Transmission in a Time of COVID"
Presentations, media contributions, and articles with interviews:
Click here for a summary of recent media interviews & appearances by Prof. Huffman, most of which relate to COVID aerosol transmission & prevention.
[2] Simple, DIY-level experiments on indoor air quality:
Carbon dioxide sensors for indoor AQ monitoring
When people exhale, they emit droplets/aerosols and carbon dioxide (CO2). For this reason, CO2 can be used as a very rough proxy for exhaled emissions from the people (+ animals) in an indoor space. Lots has been written about the use of CO2 as measure of indoor air quality, including some resources linked here. Prof. Huffman has recently been playing around with CO2 sensors (i.e. these home-versions purchased from Amazon) and will help deploy and monitor a set of the pro-versions of the same Aranet-4 sensors in DU classrooms. I will post some results of simple experiments here. See also Twitter thread here.
Summary presentation about CO2 monitoring and how to measure air exchange/ventilation rate at home
Document link, Associated Twitter thread
Box fan + filter for indoor air particle removal
It has become commonly reported and understood (e.g. here) that SARS-CoV-2 traveling via aerosols can infect people in indoor environments, especially when unprotected by masks and increased ventilation. One way to lower the probability of infection in any given indoor environment is to add air filtration to remove suspended aerosols in the room. There are lots of great resources for which commercial air purifiers to buy. A related, but cheaper idea is to build an inexpensive DIY air filter at home using a box fan and an air filter, both of which can be purchased at any home-improvement store. Prof. Huffman recently did some basic tests on a few versions of these and will post results here soon.
[3] Indoor airborne aerosol/virus probability modeling:
A simple aerosol modeling tool was released by Prof. Jose-Luis Jimenez at the University of Colorado-Boulder. That tool relies on the Wells-Riley model (1978) and utilizes simplifying assumptions about the indoor air space (e.g. full mixing of aerosol into room volume, known decay rates for gravitational settling and virus decay) to calculate probabilities of airborne COVID-19 infection. Prof. Huffman re-wrote the spreadsheet model onto a separate platform (Wavemetrics: Igor Pro) and has been using the tool to predict airborne infection probabilities in a variety of spaces on the DU campus and other locations. Simplified results will be posted here.
Model used to estimate COVID aerosol risk in university classrooms and music rehearsal activities
"Overview of COVID aerosol modeling related to music & lecture classroom activities for pre-Fall 2020 preparation at the University of Denver" (December 17, 2020)
Document link, Associated Tweet thread
Model used to estimate COVID aerosol risk at holiday meal gatherings
"Thanksgiving Dinner during COVID: Overview of Aerosol Transmission Risk Modeling" (November 17, 2020)
Document link, Associated Tweet thread
Email Prof. Huffman with any comments or questions about the above topics.
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