Eben Cross Profile picture
Oct 7 4 tweets 2 min read
This passing comment in tonight's #AAAR2022ID panel is one that really sticks with me. For much of this pandemic the thing that has F'd our collective response more than anything else is ppl's PERCEPTIONS of costs and benefits.
The strongly held BELIEF that running a box fan on low for 12h a day in every classroom of a school building for an entire school year will somehow bankrupt the district is straight up NOT TRUE.

Your PERCEPTION is wrong. Your off-hand comment is counter-productive. Your ability to do math is sub-par.

But this BELIEF is very strongly held by nearly all those in positions of power at schools bc frankly they WANT this statement to be true, so they don't have to deal w it.
Bullshit cost:benefit analyses lie at the core of our country's inability to do the right thing and deliver clean, healthy, safe air in all our kids' classrooms.

MATH v. Humans

Don't bet on MATH.

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More from @ARISense_AQ

Oct 9
aerosol-intuition 101

Where there is light, there are particles.

Where there isn't light, there are particles.
These are dust particles / 1-1000 micrometers in diameter / as far as air pollution particles go, these are BIG, way bigger than particles emitted from burning stuff (wood, gasoline, jet fuel, plastic bags, dung).
Being BIG means these particles will scatter light predominantly in the forward direction, relative to the light source (☀️) ⏩💨⏩👁️. In this video my eye is the detector, thus 'seeing' all that scattered light as I look back towards the setting sun.
Read 6 tweets
Oct 7
Eben's air-airport cartoons #AAAR2022 out! Image
Incomplete combustion here, there & everywhere. Image
Air-lock (not) Image
Read 6 tweets
Oct 6
#AAAR2022 PANEL #2

Gaps in the Aerosol Science Identified During the COVID-19 Pandemic
Q: What is the one thing we still need to know about infectious transmission?
Ans: We talked about this a little bit already.. it would be really really nice to collect a virus and say yes/no on infectious without a lab.

Most of my stuff is PCR analysis. How do you know if it's infectious?

Avoid the culture.
Read 58 tweets
Oct 6
#AAAR2022 Panel 1 - Lesson Learned from the COVID- 19 Pandemic and Panel 2 - Gaps in the Aerosol Science Identified During the COVID-19 Pandemic

1. Lessons
2. Gaps

Here we go! Hope I can learn some stuff.. 1/
Provide opportunity to have discussion. Recording video and audio to hopefully later -

@huffman just gave me permission to live tweet all this. Phew.

@PollittKrystal is tag-teaming on moderation.
Key thing you learned -

- Expect the unexpected. In beginning we focused on healthcare facilities.. fitness centers.. restuarants - realized homes bc of poor ventilation were highest problem areas for virus aerosols.

Expect what you don't expect
Read 69 tweets
Oct 6
#AAAR2022 Improvement of Air Quality in Vehicles – Simulation of Two Different Use Cases of HEPA Filtration. Matisse Lesage, David Chalet, Jérôme Migaud, Christoph Krautner, SHIKHAR ARORA, Nilesh Tharval, Martin Lehmann, MANN+HUMMEL GmbH
Ultrafine particles matter a lot. In number. 90% of the number conc. 10% of the mass (they are not heavy). But they follow gas streamlines into your body - direct route to the deepest, dearest parts of your body. You don't want this. Lots of unknowns how terrible this..
UFPs can be solved w. improved filtration in the car cabin. Cabin air filters. We manufacturer filters. Bunch of fancy filters.
Read 7 tweets
Oct 6
#AAAR2022 Aerosol Dispersion of Submicrometer Particles in an Aircraft Cabin. Stephanie Vannarath, Peter Kim, Mitchell Ford, Arvind Santhanakrishnan, Yu Feng, CHANGJIE CAI, The University of Oklahoma Health Sciences Center
Airplane cabins! Oh boy.. excited for this one.
infectious aerosols exist. Particularly interested in submicron ones - deep in our respir. tract. Travel further. Remain airborne longer. For the same mass, they have higher surface area.

Settling times of different particles 1 um. They can be suspended in the air for 9h.
Read 21 tweets

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