Discover and read the best of Twitter Threads about #IAQ
Most recents (24)
Efficiency vs. Effectiveness - They are Not the Same
Over the past 3+ years there has been a sharp rise in interest related to indoor air cleaners. I have consistently seen confusion over the terms efficiency and effectiveness. This thread is about the difference. 1/
Over the past 3+ years there has been a sharp rise in interest related to indoor air cleaners. I have consistently seen confusion over the terms efficiency and effectiveness. This thread is about the difference. 1/
When thinking about air cleaners, make sure not to conflate efficiency and effectiveness.
An air cleaner that is intended to remove aerosol particles from indoor air can be close to 100% efficient at removing particles as they flow through the device. 2/
An air cleaner that is intended to remove aerosol particles from indoor air can be close to 100% efficient at removing particles as they flow through the device. 2/
That sounds great, right? Maybe. Maybe not. In fact, a device that is 100% efficient (captures all particles that move though it) may be highly ineffective. What? How can this be? 3/
Are you looking for a tool to help estimate the risk of contagion transmission in indoor spaces? Well, look no further!
This open-source #IAQ tool considers variables of space to calculate the risk and number of purifiers needed. thememeticist.github.io/VaporWarehouse/
This open-source #IAQ tool considers variables of space to calculate the risk and number of purifiers needed. thememeticist.github.io/VaporWarehouse/
With #VaporWarehouse you can even use the particle simulation feature to visualize the number of infectious particles in the air!
With the tool, you have two options to get an estimate for the best air purifier unit for your space. Firstly, you can choose from a list of air purifiers that we have provided. Alternatively, you can input your own values and preferences to get a personalized estimate.
CO2.click monitor firmware update adds 66x more storage space
One thing I love about co2.click (by @IndianaTux) is the upgradeable firmware so I keep getting new features and improvements added to the device I bought more than a year ago. š§µ1/ #IAQ
One thing I love about co2.click (by @IndianaTux) is the upgradeable firmware so I keep getting new features and improvements added to the device I bought more than a year ago. š§µ1/ #IAQ
The latest v1.12.0 firmware update for the Model C allows the user to store 66x more data when it is offline allowing you to record data for the following lengths of time before storage is full depending on how frequently you are saving measurements: 2/
For various sampling rates you can be offline for:
66 hours = 1 sample/min
133 hours = 1 sample/2 min
333 hours = 1 sample/5 min
666 hours = 1 sample/10 min
1000 hours = 1 sample/15 min
3/
66 hours = 1 sample/min
133 hours = 1 sample/2 min
333 hours = 1 sample/5 min
666 hours = 1 sample/10 min
1000 hours = 1 sample/15 min
3/
1/8 "#Ultraviolet #germicidal #irradiation (#UVGI) is known to #inactivate various #viruses and #bacteria, including #SARSCoV2, and is widely applied especially in #medical facilities."
#COVID19 #CovidIsNotOver #COVIDisAirborne
pubs.acs.org/doi/10.1021/acā¦
An abstract thread š§µ...
#COVID19 #CovidIsNotOver #COVIDisAirborne
pubs.acs.org/doi/10.1021/acā¦
An abstract thread š§µ...
2/8 "This #inactivation results from the #high #photon #energies causing #molecular #bonds to break, but when #nonpathogen #molecules are affected, #unwanted #effects may occur."
3/8 "Here, we explored the effect of a commercial high-intensity (ā¼2 kW) #UVC #disinfection device on the #composition and #concentration of #gases and particles in #indoor #air."
š§µDo-it-yourself (DIY) air cleaners: Evidence on effectiveness and considerations for safe operation
Angela Eykelbosh, Environmental Health and Knowledge Translation Scientist, @ncceh National Collaborating Centre for Environmental Health
Jan 18/23
LINK: ncceh.ca/documents/evidā¦
Angela Eykelbosh, Environmental Health and Knowledge Translation Scientist, @ncceh National Collaborating Centre for Environmental Health
Jan 18/23
LINK: ncceh.ca/documents/evidā¦
Do-it-yourself (DIY) air cleaners: Evidence on effectiveness and considerations for safe operation
Angela Eykelbosh, Environmental Health and Knowledge Translation Scientist, @ncceh National Collaborating Centre for Environmental Health
Jan 18/23
PDF: ncceh.ca/sites/default/ā¦
Angela Eykelbosh, Environmental Health and Knowledge Translation Scientist, @ncceh National Collaborating Centre for Environmental Health
Jan 18/23
PDF: ncceh.ca/sites/default/ā¦
š¢ HAZ LO QUE DIGO vs HAZ LO QUE HAGO
1/
ā”ļøĀæQuĆ© estĆ”n haciendo realmente los lĆderes y polĆticos para si mismos en este momento?
Traduzco, interpreto y aƱado.
š
forbes.com/sites/bruceleeā¦
1/
ā”ļøĀæQuĆ© estĆ”n haciendo realmente los lĆderes y polĆticos para si mismos en este momento?
Traduzco, interpreto y aƱado.
š
forbes.com/sites/bruceleeā¦
2/
Muchos de ellos han estado presionando pĆŗblicamente para que se eliminen las precauciones Covid-19. De hecho, algunos incluso han afirmado que la pandemia ha concluido.
Muchos de ellos han estado presionando pĆŗblicamente para que se eliminen las precauciones Covid-19. De hecho, algunos incluso han afirmado que la pandemia ha concluido.
3/
Sin embargo, la pandemia no parece que haya terminado en esa reuniĆ³n anual de lĆderes polĆticos y empresariales en Davos, Suiza, conocida como el Foro EconĆ³mico Mundial (WEF).
Sin embargo, la pandemia no parece que haya terminado en esa reuniĆ³n anual de lĆderes polĆticos y empresariales en Davos, Suiza, conocida como el Foro EconĆ³mico Mundial (WEF).
"Surviving the COVID-19 #Pandemic: Things I Have Learned (So Far)"
A pandemic mitigation primer geared toward my students.
Full video (40 mins):
vimeo.com/showcase/10115ā¦
Refs in the PPT notes:
psychmike.com/Hoerger_pandemā¦
Video segments in threadš§µ
A pandemic mitigation primer geared toward my students.
Full video (40 mins):
vimeo.com/showcase/10115ā¦
Refs in the PPT notes:
psychmike.com/Hoerger_pandemā¦
Video segments in threadš§µ
1. Introduction
COVID cases and deaths were surging in New Orleans right when I launched a project working with people who are seriously ill.
Thus, I began studying COVID mitigation.
vimeo.com/789390581
COVID cases and deaths were surging in New Orleans right when I launched a project working with people who are seriously ill.
Thus, I began studying COVID mitigation.
vimeo.com/789390581
2. COVID is NOT "A Cold or the Flu"
It is among the most serious illnesses.
COVID has caused life expectancy to plummet. Ppl are getting disabled. 1.5 million Americans can't work. Vascular dysregulation is concerning. Effects are cumulative.
vimeo.com/789392012
It is among the most serious illnesses.
COVID has caused life expectancy to plummet. Ppl are getting disabled. 1.5 million Americans can't work. Vascular dysregulation is concerning. Effects are cumulative.
vimeo.com/789392012
US federal agency considering a ban on gas stoves
"US Consumer Product Safety commissioner said gas stove usage is a āhidden hazard.ā Any option is on the table. Products that canāt be made safe can be banned"
Would be great win for #IAQ #EndFossilFuels
cnn.com/2023/01/09/busā¦
"US Consumer Product Safety commissioner said gas stove usage is a āhidden hazard.ā Any option is on the table. Products that canāt be made safe can be banned"
Would be great win for #IAQ #EndFossilFuels
cnn.com/2023/01/09/busā¦
We have to get rid of gas turbines and home furnaces as fast as possible too (for climate reasons especially). But those ony pollute outdoor air, so we breathe 1000 times less of those exhausts vs. cooking stoves. Stoves are terrible for indoor pollution.
Electric induction cooks as well as gas and is much more energy efficient. And even if everyone switched, it is small in overall electricity consumption
NO reason to not get rid of cooking stoves already. Other than the pervasive influence of FF industry
NO reason to not get rid of cooking stoves already. Other than the pervasive influence of FF industry
Welcome to our š§µon clean indoor air! Each Monday weāll post threads about indoor air quality (IAQ) and its significance to health. Weāll cover the composition of air, how to measure harmful elements, and how to improve unhealthy indoor air. 1/6
#IAQ #IndoorAir #AirQuality
#IAQ #IndoorAir #AirQuality
We canāt see or touch the air around us. However, itās key to the planet and to life. It surrounds the earth and provides a protective, insulating cushion. It contains gasses vital to life: oxygen, carbon dioxide, water vapor and nitrogen. 2/6
Did you know our atmosphere is composed of 78% nitrogen and only 21% oxygen? These gasses support plants, animals and the nitrogen cycle, which keeps all life on earth in balance. 3/6
In an Invited Editorial in @JAMAOnc today, my colleagues & I call for health systems to develop āComprehensive #Pandemic Support Programsā for their most vulnerable patients.
These are our Top 10 Tips!
THREAD š§µ
jamanetwork.com/journals/jamaoā¦
These are our Top 10 Tips!
THREAD š§µ
jamanetwork.com/journals/jamaoā¦
Tip #1: Health systems should explain to all patients that #COVIDisAirborne and is best avoided through multi-layered mitigation.
Tip #2: Health systems should prioritize getting the most vulnerable patients vaccinated & boosted.
Offer #vaccines on-site w/the SAFEST options.
Vulnerable patients want highly-ventilated or outdoor options & high-quality (e.g., N95) masks for safety. Make it happen.
Offer #vaccines on-site w/the SAFEST options.
Vulnerable patients want highly-ventilated or outdoor options & high-quality (e.g., N95) masks for safety. Make it happen.
Terna perfetta: @MilaSpicola, Giorgio Buonanno e Luca Pauletti agli #StatiGeneralidellaScuola su QualitĆ dell'Aria Indoor #IAQ a #scuola.
Sintesi:
- ĆØ necessario un cambiamento epocale per rendere quanto piĆ¹ #salubre l'aria nei luoghi al chiuso condivisi, a partire dalle #scuole.
Sintesi:
- ĆØ necessario un cambiamento epocale per rendere quanto piĆ¹ #salubre l'aria nei luoghi al chiuso condivisi, a partire dalle #scuole.
- l'esigenza di salubritĆ dell'aria al chiuso non ĆØ solo riferita al #Covid, ma a qualsiasi agente #patogeno aereo, non solo biologico, ma anche non biologico (per es #Radon, ma anche #VOC e #particolato atmosferico in genere).
- l'esigenza di ricambio dell'aria al chiuso non puĆ² essere affidata alle "finestre aperte", ma ad adeguati sistemi automatici di ricambio dell'aria (alias #VMC), non solo per motivi di maggiore #efficacia del ricambio d'aria, ma anche di maggiore #efficienza (energetica).
Mr. Nick Rice @ihrice w/@Intermountain presented a powerful, under recognized presentation in #Utah on #IAQ
& 100% in line with @linseymarr @CorsIAQ @JimRosenthal4 @WBahnfleth š#SARS_CoV_2.
Entire #SLC #IAQ Summit: #UTed
A few clips in this š§µfollow:
& 100% in line with @linseymarr @CorsIAQ @JimRosenthal4 @WBahnfleth š#SARS_CoV_2.
Entire #SLC #IAQ Summit: #UTed
A few clips in this š§µfollow:
š2/n Start with #MERV13
(In the Q&A at the end of the full presentation we learn that @slcschools has now fully implemented #MERV13 filters in all schools.)
@SaltLakeHealth #UTed
(In the Q&A at the end of the full presentation we learn that @slcschools has now fully implemented #MERV13 filters in all schools.)
@SaltLakeHealth #UTed
3/n More on #MERV13
Keep the fan on 24/7 (Do Not USE "Auto") on your HVAC.
Change filters more often.
Keep the fan on 24/7 (Do Not USE "Auto") on your HVAC.
Change filters more often.
CO2 monitors are a great tool for managing indoor air quality. <3
ASHRAE Position Doc on Indoor Carbon Dioxide (2022): ashrae.org/file%20libraryā¦
My Canadian source for Aranet4 is @Prescientx1: prescientx.com/products/araneā¦
Rebreathed CO2 decal is by @amandalhu: 1eb3b6.myshopify.com/products/araneā¦
ASHRAE Position Doc on Indoor Carbon Dioxide (2022): ashrae.org/file%20libraryā¦
My Canadian source for Aranet4 is @Prescientx1: prescientx.com/products/araneā¦
Rebreathed CO2 decal is by @amandalhu: 1eb3b6.myshopify.com/products/araneā¦
#COVIDisAirborne #BringBackMasks #CleanTheAir #engineering #IAQ #SARSCoV2 #humanrights #COVID19 #VaccinesPLUS #DisabilityRights #inclusion #accessibility
Shared spaces with mandates for clean indoor air as per ASHRAE & high efficacy masking are safer and more accessible for all.
Shared spaces with mandates for clean indoor air as per ASHRAE & high efficacy masking are safer and more accessible for all.
On @DonateMask's store, you can find CO2 monitors under $100 and support a good cause at the same time.
#COVIDisAirborne #CleanTheAir donatemask.ca/store
#COVIDisAirborne #CleanTheAir donatemask.ca/store
Also, fangen wir mal hinten an, Ich werde jetzt nach und nach #Literatur zu den #Luftreinigern twittern, um die Diskussion zu substantivieren.
I'll do that mainly in English, at times in German.
Let's start. (AC-1) Nature News, October 2021.
1
I'll do that mainly in English, at times in German.
Let's start. (AC-1) Nature News, October 2021.
1
Of course, this is only a #News article in @Nature. The paper, at that time only a preprint, now appeared here:
AC-2 = bit.ly/3EMNQWs
2
AC-2 = bit.ly/3EMNQWs
2
In this work, authos state "Here we present
the first data providing evidence for the removal of SARS-CoV-2 and microbial bioaerosols from the air using portable air filters with UV sterilization on a COVID-19 ward."
I think this is true, in the paper actually particles...
3
the first data providing evidence for the removal of SARS-CoV-2 and microbial bioaerosols from the air using portable air filters with UV sterilization on a COVID-19 ward."
I think this is true, in the paper actually particles...
3
"Indoor Air Management of Airborne Pathogens: Lessons, Practices, and Innovations" eventbrite.com/e/indoor-air-mā¦
Workshop by @theNASEM focusing on the current state of knowledge ā”ļø practical lessons learned. Session 1 starting now.
Live-tweets below
#EHMI #NASEM #EnviroHealthMatters
Workshop by @theNASEM focusing on the current state of knowledge ā”ļø practical lessons learned. Session 1 starting now.
Live-tweets below
#EHMI #NASEM #EnviroHealthMatters
2/ @Don_Milton summarizes evidence that saliva PCR much better at catching COVID positive cases than PCR from nasal swabs.
3/ @Don_Milton: It's the *combination* of masks, ventilation, filtration that can dramatically reduce spread
@fordnation
@SylviaJonesMPP
#Wave7 of BA5 is here
#Wave8 of BA2.75 on its heels
Re/infection prevention of #SARS2 is your job on a population level
Please act #FASSST
@SylviaJonesMPP
#Wave7 of BA5 is here
#Wave8 of BA2.75 on its heels
Re/infection prevention of #SARS2 is your job on a population level
Please act #FASSST
Hereās what #SARS2 can do to our children now
H/T @itosettiMD_MBA
Re/infection prevention of #SARS2 is your job on a population level
Please act #FASSST
H/T @itosettiMD_MBA
Re/infection prevention of #SARS2 is your job on a population level
Please act #FASSST
I donāt want #LongCovid for myself or my child,
which can happen no matter how mildly initially infected,
for which there is no treatment or cure
Re/infection prevention of #SARS2 is your job on a pop level
#LongCovid PHO=51-80%
publichealthontario.ca/-/media/Documeā¦
Please act #FASSST
which can happen no matter how mildly initially infected,
for which there is no treatment or cure
Re/infection prevention of #SARS2 is your job on a pop level
#LongCovid PHO=51-80%
publichealthontario.ca/-/media/Documeā¦
Please act #FASSST
Goodbye Kuopio,goodbye #IndoorAir2022. Thank you @isiaq and all the organisers for a wonderful conference with great venues, great science, great food and lots of conversations 1/
After 2 years of working under enormous pressure, this week has been the biggest mental reset Iāve had in a very long time. Being able to share experiences and have time to reflect on the future research has been amazing 2/
Iāve met up with many #IAQ friends who I last saw in 2018 and it has been great to catch up on the work theyāve been doing and all the social aspects 3/
A must read if you are using #CO2 as a proxy for #ventilation/#IAQ: The ASHRAE Position Document on Indoor Carbon Dioxide by the experts including Drs. Persily, Mandin, Kipen, Lau, Sekhar, Ms. Lan Chi Nguyen Weekes @WBahnfleth @WargockiPawel ashrae.org/file%20libraryā¦
"This position document discusses the role of indoor #CO2 in the context of building ventilation and IAQ based on ASHRAEās long involvement with those topics as well as the interests of its members and stakeholders."
Iāve been seeing a push to get MCPS teachers KN95 masks.
Obviously, getting vaccinated is hugely important.
Ventilation in schools is important.
ā¦and masks are certainly part of the mix keeping the air clear, because after all, #COVIDisairborne
Obviously, getting vaccinated is hugely important.
Ventilation in schools is important.
ā¦and masks are certainly part of the mix keeping the air clear, because after all, #COVIDisairborne
As you are thinking about mitigating occupational hazards, youāve got to think about the NIOSH hierarchy of controls. That upside-down pyramid is a good reminder to take care of the most important things first. cdc.gov/niosh/topics/hā¦
š§µ I made another #corsirosenthalbox air cleaner today for my wife's HS classroom. Our city is on fire with infections today, so I wanted to take the opportunity to show others how EASY it is to assemble something that can š COVID transmission in a classroom or home. 1/n
All of the supplies can be found at Lowe's for $85. I upgraded the filters to MERV 14 (3M Filtrete 2500), so that added another $25. Four filters, a 20ā box fan, roll of duct tape, and a sharp utility knife is all that's required. Here I have cut the top & bottom off the box. 2/n
Next start standing up your filters, use a small piece of tape to hold them together while you get it figured out. Each side will be 21ā long. Make a cube. The filters are directional, & have an arrow on the sides to indicate airflow. š©Make certain all ā”ļø point in to center. 3/n
1/8 What we need is;
#CommunityAction
#MaskUp
#BackToSchool
Thanks to @CoSchoolsTools @guardian @zoesqwilliams
@HenryBurridge @Elodie_A_N
#LongCovidKids #Education #TEACHers #SpotCovid
shoutout.wix.com/so/24Nugz070?lā¦
#CommunityAction
#MaskUp
#BackToSchool
Thanks to @CoSchoolsTools @guardian @zoesqwilliams
@HenryBurridge @Elodie_A_N
#LongCovidKids #Education #TEACHers #SpotCovid
shoutout.wix.com/so/24Nugz070?lā¦
2/8 To assist with @GOVUK rollout of CO2 monitors to schools @CoSchoolsTools have created 4 videos, and other materials, that aim to explain how #CO2monitors can help #teachers manage their classroom #ventilation for comfortable healthier learning.
coschools.org.uk
coschools.org.uk
3/8
@MichaelRosenYes please could you help us get these videos to schools?
#CommunityAction #LongCovidKids #BackToSchool
#Education #MaskUp #Kids #SpotCovid
@MichaelRosenYes please could you help us get these videos to schools?
#CommunityAction #LongCovidKids #BackToSchool
#Education #MaskUp #Kids #SpotCovid
ICYMI, @By_CJewett did an excellent job last week on #ScienceFriday w/ @iraflatow. Worth a 14-min listen on key points about air cleaners for school & elsewhere.
Here are some additional thoughts & links on in-room air cleaners as a š§µ (1/x)
soundcloud.com/scifri/are-higā¦
Here are some additional thoughts & links on in-room air cleaners as a š§µ (1/x)
soundcloud.com/scifri/are-higā¦
2/ I think this bit from @By_CJewett takes it home:
"Your HEPA filter is kind of like a pair of kaki pants or a garden hose. It's not on-patent, it's not expensive, it's not that hard to find, and there's not a salesforce for it."
soundcloud.com/scifri/are-higā¦
"Your HEPA filter is kind of like a pair of kaki pants or a garden hose. It's not on-patent, it's not expensive, it's not that hard to find, and there's not a salesforce for it."
soundcloud.com/scifri/are-higā¦
3/ "But what you do see is the more electronic air cleaners. Those are the companies going to the school boards, talking about ionization ... they sound spectacular"
The Concord project opted to go with Solar (PV) connected to an energy storage system (battery storage) in lieu of a backup generator.
This system has been designed to keep the critical loads for the home operational even if the utility power is knocked out.
This system has been designed to keep the critical loads for the home operational even if the utility power is knocked out.
This includes the backup heating and domestic hot water system (gas boiler with radiant floor heat + indirect hot water tank), the refrigerator, freezer, microwave, TV/WiFi, lighting and receptacles in strategic areas.
The Generac PwrCell provides 18 kWh of battery storage in a single cabinet, and up to 9 kW of continuous power output, enough to power the critical loads for extended periods of time. It can also be expanded to 36 kWh of battery storage in the future should it ever be needed.
