Eben Cross Profile picture
Oct 5 8 tweets 1 min read
#AAA2022 Performance of Plantower PMS Sensors and the Alphasense Optical Particle Counter for Measuring PM10 Concentration in the Laboratory and Field. KERRY KELLY, Kamaljeet Kaur, Ross Whitaker, University of Utah. 1/
The "Great" Salt Lake is no longer 'so great' -

We have a large 750 mile stretch of dry lake bed. Prevailing wind pushes the air into population of over 1M people.
5 dust events in a single month this past Spring. That's unusual. Used to be maybe ~ 1 dust event/mo.
Running VOAG 2 micron particles PA-IIs are completely BLIND. Blind people. Doesn't detect them. Any of them.

Same story for the 10 micron particles.
Alternatively - good sensitivity from the OPC-N3 to 2 micron and 10 micron DOS particles in the lab.
Field stuff: Comparing the PMS5003 and OPC-N3 PM10 results against BAM PM10. PMS is trash. OPC-N3 is good. No surprises here folks - physics matters.
PM2.5/PM10 ratio correction factors... try and reconcile PMS5003 response to dust..
But you still need to make a legit measurement of PM2.5 and PM10 to get the ratio, right? (I am confused - Eben speaking here..)

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More from @ARISense_AQ

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
Oct 6
#AAAR2022 Suppressing Spread of Viral Sneeze Droplets Using Transparent Curtains in Large Food Processing Facilities. SUNIL KUMAR, Maria King, David Klassen, Texas A&M University
Modeling rooms with and without partitions
Many studies show HVAC matters (a lot) in reducing spread of virus.
Read 18 tweets
Oct 6
#AAAR2022 Spray Droplet Size in Liquid Sheets Containing Surfactants and Oil Emulsions. IAROSLAV MAKHNENKO, Long Nguyen, Cari Dutcher, Christopher J. Hogan, Elizabeth Alonzi, Christine Colby, Steven Fredericks, University of Minnesota
Agricultural spraying - spraying drift is a problem. 30% of all complaints come from this phenom. Droplets are traveling long distances airborne.

100-150 micron droplets.

Need to prevent spray drift: Trees around your field.
droplet size distribution - controls -

Chemical composition and Nozzle type
Read 12 tweets
Oct 6
#AAAR2022 Cleaning the Indoor Air with Low-Cost DIY Air Cleaners. Nirmala Thomas Myers, Taewon Han, Kevin Dillon, GEDIMINAS MAINELIS, Rutgers, The State University of New Jersey

#CorsiRosenthalBox talk
CR/DIY Filtration -

Measured dB, fan temp, power consump. (kWh), air velocity, particle concentraitons

Purchased a bunch of Lasko fans

Bunch of filters MERV 8-13 1-4" thick.
Made single panel versions
2-filter version (triangle)
CR 4-filter version
Read 12 tweets
Oct 5
#AAAR2022 Characterizing and Comparing Respiratory Aerosol Emission for Pre-adolescent, Adolescent, and Adults during Sustained Phonation. MAHENDER SINGH RAWAT et al. Clarkson University
Respiratory aerosol emissions.. size distribution matters, virality matters.
Motivation - respiratory aerosols well reported for adults - but less for kids / young adults
Read 20 tweets

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