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Eben Cross Profile picture
@ARISense_AQ
Nov 3, 2022 • 5 tweets • 3 min read • Read on X
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Looking forward to participating in tomorrow's #ClimatetechSummit and teaching folk that all AIR POLLUTION (not just CH4 + CO2) is worthy of their time/attention/resources.

The fight to save planet earth starts and ends with the air you breathe.

@GreentownLabs Photo of mid setup phase of...
Chairs less pile-ish. Nicely arranged chairs for ...
MOD-PM-eyed view of festivities. Not a lotta resuspended dust at the moment tho. Image
Some people take selfies with celebrities.. others take selfies with AQ sensors. Image
Bird's-eye view of today's @GreentownLabs #ClimateTechSummit Image

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More from @ARISense_AQ

Eben Cross Profile picture
Oct 9, 2022
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
Eben Cross Profile picture
Oct 7, 2022
Eben's air-airport cartoons #AAAR2022 out!
Incomplete combustion here, there & everywhere.
Air-lock (not)
Read 6 tweets
Eben Cross Profile picture
Oct 7, 2022
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.
Read 4 tweets
Eben Cross Profile picture
Oct 6, 2022
#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
Eben Cross Profile picture
Oct 6, 2022
#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
Eben Cross Profile picture
Oct 6, 2022
#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

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