1/ As inferno of infection kills & drives nation to the abyss, many governors starting to take stricter action. Many waited too long, frozen in headlights, or in denial. Need strong leadership (courage) to reduce inhalation dose (& so cases & deaths). Just Do It!
2/ "Fits & starts" has been a HORRIBLE approach & only added to suffering, deaths, economic crisis, lost jobs, detriment to education of children. The correct approach was all-out assault on reducing inhalation dose to "starve" virus of hosts and then manage it like others did.
3/ Much more difficult to do this now because of lack of leadership & long delay in listening to experts related to transmission by and control of aerosol particles that are ride share for virus. Need an all-out assault to reduce inhalation dose now to save lives. Let's do it!
4/ Stay home when possible. Stay away from non-essential indoor spaces. Wear a mask. Avoid ANY indoor space where others do not. Reduce time in essential indoor spaces (including home if non-immediate family visit. Test before if possible / meet outside if possible). Just do it!
5/ Physically distance. Increase ventilation. Improve filtration. Employ portable HEPA filters. Hand hygiene. Isolate those w/ symptoms under negative pressure (box fan w/ flow pointing out of open window). Just do it!
6/ Use your noggin. Protect yourself. Protect those you love. Protect your friends & colleagues. Protect front-line health care workers. Protect those you don't know, for they may infect those you know & others. Protect health and longer-term economy of community. Just Do It!

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More from @CorsIAQ

15 Nov
1/ Much of US is on fire w/ COVID-19 infection & the flames are only getting hotter. Politicians & the general public who continue to be cavalier about, or blind to, this inferno are adding fuel to fire. People are burning. People are dying.1st responders are exhausted & dying.
2/ We know what to do. Wear a mask in indoor spaces outside of own home w/ immediate family, avoid non-essential indoor spaces, limit time in indoor spaces where you must go, physically distance. Just do it!
3/ Business or building owners/building managers: Require masks, design for physical distancing, reduce density, increase ventilation, improve filtration and/or employ UV. Just do it!
Read 5 tweets
13 Nov
1/ Heading to 200K/day this month & 300K/day in Dec. Increased death rates to follow. What got us here is obvious. Failed leadership. Ill preparedness. Stubbornness. Failed communication. Irresponsible behavior. Water under bridge now. Learn from it, but move on w/ urgency.
2/ Do we act now to save hundreds of thousands more from gasping for breath & dying without family around them, the heartache of losing loved ones, the struggles of those who survive, the horrific impacts on our economy? Acting now is responsible, empathetic, and patriotic.
3/ Please be a patriot. Act. Wear a mask in any indoor space other than your own home w/ immediate family present. Visit only essential indoor spaces where everyone wears a mask. Reduce time in those spaces. Distance. Ventilate. Filter. Sanitize hands. Help to educate others.
Read 5 tweets
12 Nov
1/ Complexity of Close Contact

Inhaled deposited dose of aerosol particles via close contact is difficult to model, even if two people stay facing each other at 4 - 6 feet apart, due to huge variations in emissions as well as dispersion of the plume between them.
2/ If the indoor space is a crowded event (e.g., wedding reception, bar, etc.) in which people move around, the complexity becomes even greater. How often does a person come in close contact with one or more infectors? What is the average contact time?
3/ I have been thinking back to my PhD dissertation (way back in the day) when I studied and applied surface renewal theory for gas transfer at interfaces where liquid-phase mass transfer dominates.
Read 5 tweets
11 Nov
1/ Gr8 that @cdc has discovered the dual (lower emissions & less inhalation dose) benefits of masks. A 5 min Sci Citation Index search leads to several past papers of relevance. Here is one by researchers @cdc's very own @NIOSH from 2010.

2/ This paper was cited in tweets by several researchers earlier in the pandemic & shows 40% to 60% removal efficiency (100% - penetration%) for 1 um particles at receptor end (& so even better for > 1 um) for some materials (much worse for others).
3/ More recent results reported by @linseymarr, @Smogdr, & their colleagues/teams significantly increase knowledge of different materials, layered materials, particle size effects, etc.

My previous tweet illustrating dual benefits. 40+40 = 64%, 50+40 = 70%, 60+60=84%, etc.
Read 4 tweets
7 Nov
1/ Yes! Right on, @CathNoakes. Infection via ride share (for both drivers and passengers) has indeed been a concern of mine for a long time given its increasing use.

Op-ed w/ Joe Allen here. And simulation below.

2/ Simulation I did for background aerosol particles in the cab of a typical-sized vehicle and realistic ventilation. The vertical axis is inhaled deposited dose in ride share normalized by that of those infected in Restaurant X in China with same infector emissions. Image
3/ That red bar with windows closed and no outdoor intake underscores high risk. Simulation is without masks, so bars lower if driver and passenger(s) wear masks. Opening windows (even a small amount) dramatically reduces dose. Avoiding busy commutes (shorter time) also helps.
Read 4 tweets
6 Nov
1/ Important move. Tamp it down before losing control.

"Oregon has recorded more coronavirus cases over the past week than at any point since the pandemic began"

"Active hospitalizations and the test positivity rate are also at record highs."
2/ But we could use more than limits (or recommendations) on social gatherings. Responsible businesses, gov agencies, school districts, etc., should require & enforce masks, employ strict physical distancing, increase outdoor air supply rates, & employ advanced filtration.
3/ If we are relentlessly committed to actions that dramatically reduce inhaled dose (whether from close contact or far field) of SARS-CoV-2 (it's wholly possible to reduce dose by 90 to 95% in most buildings), we can stop the frustrating cycle of starting & stopping in fits.
Read 4 tweets

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