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Shelly Miller, PhD Profile picture
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May 10 • 4 tweets • 3 min read
A must read if you are using #CO2 as a proxy for #ventilation/#IAQ: The ASHRAE Position Document on Indoor Carbon Dioxide by the experts including Drs. Persily, Mandin, Kipen, Lau, Sekhar, Ms. Lan Chi Nguyen Weekes @WBahnfleth @WargockiPawel ashrae.org/file%20library…
"This position document discusses the role of indoor #CO2 in the context of building ventilation and IAQ based on ASHRAE’s long involvement with those topics as well as the interests of its members and stakeholders."
"The positions stated within address the use of #CO2 as a metric of #IAQ and ventilation, the impacts of CO2 on building occupants, the measurement of CO2 concentrations, ..."
"..the use of #CO2 to evaluate and control outdoor air ventilation, and the relationship of indoor CO2 to airborne infectious disease transmission."

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More from @ShellyMBoulder

Shelly Miller, PhD Profile picture
Jan 18
I keep wondering...why have so many (schools) thrown $$$ at ionization without any scientific evidence that it works, yet are scared of upper room UV lamps because it might be installed/maintained wrong; but there is solid science behind UV for disinfecting air.
We know how to do this. The first test was by some infectious disease docs wanting to disrupt measles transmission in schools. So they installed upper room UV. Guess what?
The school with the UV in the classroom had fewer measles cases. ajph.aphapublications.org/doi/10.2105/AJ… and ghdcenter.hms.harvard.edu/files/ghd_duba…
Read 12 tweets
Shelly Miller, PhD Profile picture
Oct 11, 2021
“this virus is one of the easiest, by far, to kill with UV light,” said senior author Karl Linden, #CUBoulder professor of environmental engineering.
colorado.edu/today/2021/10/…
“It takes a very low dose. This indicates that UV technology could be a really good solution for protecting public spaces.”
Germicidal UV at 254 nm commercially available now for upper room use in spaces such as restaurants, homeless shelters, hospital ERs, schools etc.
Read 4 tweets
Shelly Miller, PhD Profile picture
Sep 27, 2021
Very interesting study just published! Airborne SARS‐CoV‐2 surveillance in hospital environment using high‐flowrate air samplers and its comparison to surface sampling onlinelibrary.wiley.com/doi/full/10.11…
findings show air sampling as a successful tool for environmental surveillance of airborne SARS-CoV-2 in hospitals
Opt for higher air sampling flowrate-it improves the chance of successful airborne SARS-CoV-2 surveillance especially in sites that are highly ventilated
Read 4 tweets
Shelly Miller, PhD Profile picture
Sep 13, 2021
Check out our great new paper led by Dr. Wagner: Modeling the impacts of physical distancing and other exposure determinants on aerosol transmission. Glad to be a part of this analysis, with amazing colleagues Drs. Sparks, Chen, Waldman and Dr. Macher oeh.tandfonline.com/doi/full/10.10…
a particle size-dependent aerosol release model was developed to assess impact of near-field transport of infectious aerosol. This is essentially what is happening when you are standing close to someone that is infectious...
we find that short-range (proximity) and long-range (background) transmission is additive and so both must be mitigated at the same time.
Read 6 tweets
Shelly Miller, PhD Profile picture
Apr 14, 2021
Measurements and Simulations of Aerosol Released while Singing and Playing Wind Instruments.The preprint of our paper is now available! scholar.colorado.edu/concern/articl… Our amazing research team includes @marinavance @mspede @Don_Milton @James_Weaver_83
ABSTRACT: Outbreaks from choir performances, such as the Skagit Valley Choir, showed that singing brings potential risk of COVID-19 infection. There is less known about the risks of airborne infection from other musical performance,
such as playing wind instruments or performing theatre. In addition, it is important to understand methods that can be used to reduce infection risk. In this study, we used a variety of methods,
Read 8 tweets
Shelly Miller, PhD Profile picture
Jan 8, 2021
1/ ICYMI paper on variant linking epic and genetic data: imperial.ac.uk/media/imperial… 1. the variant does appear to be more transmissible. From my read of the paper, it accounts for about a half to 2/3 of an additional infection per every additional transmission.
2/ SO for example if I have COVID and I give it to my husband, highly likely, then if I had this variant, I might also give it to 1/2-2/3 of another person - which is not physically possible, of course!
3/ I might also give it to my son resulting in 2 infections, but then the next person with the variant may only give it to one additional person, so between the 2 of us with the variant, the result is 3 additional infections instead of 2 if we were transmitting the non variant.
Read 8 tweets

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