Elliott Gall

Associate professor at Portland State University. Working on indoor air quality and building science.

[Elliott Gall @etgall]

Summer's here and wildfires are looming large - now is the time to prep for woodsmoke events. I'm sharing some of my thoughts on creating a "clean room" in your home using air cleaning, air sealing, and simple strategies for managing indoor emissions:
https://t.co/nl1IEBLPEe

[Environmental Science & Technology Journals @EnvSciTech]

.@linseymarr of @virginia_tech @VirginiaTechCEE evaluated the impact of an in-duct #BipolarIonization system in a lecture hall and found that #ionization did not significantly affect culturable #Airborne bacteria.

#OpenAccess ACS ES&T Air: https://t.co/WbPI6FPivo

[Elliott Gall @etgall]

@CorsIAQ Thanks, Rich!

[Elliott Gall @etgall]

Thrilled to announce the launch of a 16-credit graduate certificate in Healthy+Efficient Buildings @MaseehCollege @MMEpdx

https://t.co/yzzqAZpXrC

Over 1-year you'll learn fundamentals of HVAC, building energy, indoor air quality + elective. DM me for more info!

[Environmental Health Perspectives @EHPonline]

NEW FOCUS: After the Smoke Clears: Wildland–Urban Interface Fires and Residues in Nearby Homes ➡️ https://t.co/37RHCGDAYu @GouwLab @ChemDelphine @etgall @arthurmcchan @j_g_allen @ShantanuJathar

[Elliott Gall @etgall]

Great work by @brettwstinson Full paper at: https://t.co/wR6uAMTY00

[Richard Corsi, PhD, PE (Texas) @CorsIAQ]

One more study presented by Brett Stinson comparing PM removal from simulated wildfire smoke. CR box wins again.

#IndoorAir2024

[Elliott Gall @etgall]

Fantastic work by Amity and @brettwstinson. Check out the open access paper here: https://t.co/jR7I69sBKN

[Richard Corsi, PhD, PE (Texas) @CorsIAQ]

Amity Deters of Portland State University presented conclusions of outstanding research on CR Boxes. Once again, CR Boxes work very well with effectiveness (reductions in wildfire smoke particles) of approximately 90% or higher in model spaces.

[Elliott Gall @etgall]

Declaring victory on #IndoorAir2024 day 1 w/ @KarenCDannemiller. Excited for tech program to begin tomorrow.

[Elliott Gall @etgall]

@CorsIAQ @ut_caee Thanks, Rich. So thrilled you were there, and so very glad you sent that letter 17 years (!) ago

[Elliott Gall @etgall]

Fantastic cover for the great work, by lead author @brettwstinson

[Environmental Science & Technology Journals @EnvSciTech]

In this ACS ES&T Air article, @etgall of @Portland_State characterizes and evaluates the ability of #aircleaners to remove particle and gas-phase pollutants under realistic indoor #wildfiresmoke conditions.

Read the cover story here 👉 https://t.co/qPgjvN3FWK

[Environmental Science & Technology Journals @EnvSciTech]

In this ACS ES&T Air article, @etgall of @Portland_State characterizes and evaluates the ability of #aircleaners to remove particle and gas-phase pollutants under realistic indoor #wildfiresmoke conditions.

Read the cover story here 👉 https://t.co/qPgjvN3FWK

[Elliott Gall @etgall]

@Stoffel78179983 @ShivenTaneja True overall. Though the specific claim by the CDC post that motivated this work was that construction quality issues may result in leaks and gaps that impact effectiveness. Our aim was to try to isolate that effect in our study.

[Elliott Gall @etgall]

The CDC has stated "construction quality...could substantially affect the performance of DIY air filtration units". Our new study on CR Boxes sought to investigate this claim. Main result? 8 novices built 8 different CR Boxes w/ 8% variability in CADR.
https://t.co/6QkLAmuUdH

[Elliott Gall @etgall]

This was a really fun study, with great work by @brettwstinson and enabled by a fantastic summer undergrad Amity Deters, who will be presenting this work @IndoorAir2024!

[Elliott Gall @etgall]

Finally, we modeled a scenario where a newly-built CR box is immediately deployed, e.g. to a bedroom during a wildfire smoke event. Across AER 0.1-1 /h, CR box significantly reduces PM2.5 while there was a short period of elevated BTEX due to off-gassing from tape.

[Elliott Gall @etgall]

@nadineborduas @UBCNews cool paper! our journal club reading for next week.

[Elliott Gall @etgall]

@ParentMishmash Yes, unit D/S1 was a CR-Box air cleaner made with carbon impregnated filters. Not very effective. We have since tested some other filters that, on their own, have higher single pass removal efficiency such that we'd expect higher BTEX CADRs.

[Elliott Gall @etgall]

Glad to share our recently published study in ES&T Air evaluating 13 different air cleaners for PM and VOC removal under wildfire smoke conditions. We evaluated 13 different commercial and DIY air cleaners in a test chamber w/ pine needle wildfire smoke challenge

[Elliott Gall @etgall]

@LazarusLong13 @CorsIAQ @JimRosenthal4 @DavidElfstrom @amandalhu @CleanAirCrewOrg @sri_srikrishna @cleanairkits @JoshuaCAgar @edsuom For clarity, D/S1 is a CR box style air cleaner with carbon-impreganted filters. I'm aware of other groups who tested different filters with the same idea and claim higher removal, though I'm not aware if they've yet reported CADR type results to help compare.