I wish I felt hopeful but we are in the grip of right wing populist antiscience. I think we will make incremental progress and grassroots is the place to be. The best way we can bring change this year is by doing tangible things. Fundraise for clean air, build crboxes, set up mask blocks, hand out 🧵
Any predictions from you or anyone else how the 7th year of the #Covid #pandemic will unfold? With #unions on board there would be some hope of establishing #IAQ #IndoorAirQuality in workplaces (including public buildings because they are also workplaces for some). #CovidisnotOver #CovidisAirborne
December 27, 2025 at 11:41 AM
I wish I felt hopeful but we are in the grip of right wing populist antiscience. I think we will make incremental progress and grassroots is the place to be. The best way we can bring change this year is by doing tangible things. Fundraise for clean air, build crboxes, set up mask blocks, hand out 🧵
Some HEPA units that filter classroom air are loud, but SO necessary to clean the air to help prevent airborne pathogen spread.
We turned this issue into a class project building PC fan #CRboxes to help filter the air in our classrooms.
Students need to learn how to measure air quality & clean it🙌
We turned this issue into a class project building PC fan #CRboxes to help filter the air in our classrooms.
Students need to learn how to measure air quality & clean it🙌
December 23, 2025 at 6:38 PM
Some HEPA units that filter classroom air are loud, but SO necessary to clean the air to help prevent airborne pathogen spread.
We turned this issue into a class project building PC fan #CRboxes to help filter the air in our classrooms.
Students need to learn how to measure air quality & clean it🙌
We turned this issue into a class project building PC fan #CRboxes to help filter the air in our classrooms.
Students need to learn how to measure air quality & clean it🙌
I've been exposed to flu and COVID daily at work, but my super powers are keeping me healthy👍
Never remove my Q100 in the school, use nasal sprays before and after entry, avoid large crowds whenever possible, always run #CRboxes in my classroom, doors/windows open.
Never remove my Q100 in the school, use nasal sprays before and after entry, avoid large crowds whenever possible, always run #CRboxes in my classroom, doors/windows open.
December 19, 2025 at 10:28 PM
I've been exposed to flu and COVID daily at work, but my super powers are keeping me healthy👍
Never remove my Q100 in the school, use nasal sprays before and after entry, avoid large crowds whenever possible, always run #CRboxes in my classroom, doors/windows open.
Never remove my Q100 in the school, use nasal sprays before and after entry, avoid large crowds whenever possible, always run #CRboxes in my classroom, doors/windows open.
If my classroom (with PM2.5=0 all day and desktop #CRboxes spread throughout) has 10 students sick, then imagine how bad things are in all other classrooms/schools throughout Ontario.
Our children DO NOT need to get sick to get stronger.
PREVENTING illness with N95s maintains a healthy immune system
Our children DO NOT need to get sick to get stronger.
PREVENTING illness with N95s maintains a healthy immune system
December 8, 2025 at 10:00 PM
If my classroom (with PM2.5=0 all day and desktop #CRboxes spread throughout) has 10 students sick, then imagine how bad things are in all other classrooms/schools throughout Ontario.
Our children DO NOT need to get sick to get stronger.
PREVENTING illness with N95s maintains a healthy immune system
Our children DO NOT need to get sick to get stronger.
PREVENTING illness with N95s maintains a healthy immune system
The key is to prevent illness.
How?
Iota-carrageenan nasal spray, N95 or Q100 respirator, CRboxes/HEPA filters, open windows/doors.
All work together to help prevent airborne pathogen spread.
How?
Iota-carrageenan nasal spray, N95 or Q100 respirator, CRboxes/HEPA filters, open windows/doors.
All work together to help prevent airborne pathogen spread.
December 8, 2025 at 10:08 PM
The key is to prevent illness.
How?
Iota-carrageenan nasal spray, N95 or Q100 respirator, CRboxes/HEPA filters, open windows/doors.
All work together to help prevent airborne pathogen spread.
How?
Iota-carrageenan nasal spray, N95 or Q100 respirator, CRboxes/HEPA filters, open windows/doors.
All work together to help prevent airborne pathogen spread.
To prevent infection we must open windows in shared air spaces, use hepa air purifiers or crboxes. Wear an ffp2 respirator. Of course vaccinate to reduce severity, if you can access one.
November 24, 2025 at 12:18 PM
To prevent infection we must open windows in shared air spaces, use hepa air purifiers or crboxes. Wear an ffp2 respirator. Of course vaccinate to reduce severity, if you can access one.
Adding to this CO2 monitoring tech, the perfect venue would include whisper-quiet PC fan #CRboxes spread throughout the facility because the MERV-8s will do virtually nothing to remove PM2.5s from the indoor air.
Here is a great DIY #CRbox
youtu.be/Ird0-orsSGM?...
Here is a great DIY #CRbox
youtu.be/Ird0-orsSGM?...
November 23, 2025 at 4:21 PM
Adding to this CO2 monitoring tech, the perfect venue would include whisper-quiet PC fan #CRboxes spread throughout the facility because the MERV-8s will do virtually nothing to remove PM2.5s from the indoor air.
Here is a great DIY #CRbox
youtu.be/Ird0-orsSGM?...
Here is a great DIY #CRbox
youtu.be/Ird0-orsSGM?...
Another 'Public Health' FAIL.
All advertisements re: Cold/Flu/COVID must include the importance of RESPONSIBLE socializing (including N95 use, improving ventilation by opening windows/doors, and using HEPA filters/CRboxes for improved air filtration) in public spaces.
...
All advertisements re: Cold/Flu/COVID must include the importance of RESPONSIBLE socializing (including N95 use, improving ventilation by opening windows/doors, and using HEPA filters/CRboxes for improved air filtration) in public spaces.
...
November 13, 2025 at 4:15 PM
Another 'Public Health' FAIL.
All advertisements re: Cold/Flu/COVID must include the importance of RESPONSIBLE socializing (including N95 use, improving ventilation by opening windows/doors, and using HEPA filters/CRboxes for improved air filtration) in public spaces.
...
All advertisements re: Cold/Flu/COVID must include the importance of RESPONSIBLE socializing (including N95 use, improving ventilation by opening windows/doors, and using HEPA filters/CRboxes for improved air filtration) in public spaces.
...
Norfolk measles outbreak (incubation time of 21 days) will likely start to see increased +ve cases during March Break.
Bigger than the outbreak in Texas already😓
#N95orbetter
#CRboxes
#⬆️ventilation
Public Health is ill-advised & are not protection the public from infection.
Their standards suck.
Bigger than the outbreak in Texas already😓
#N95orbetter
#CRboxes
#⬆️ventilation
Public Health is ill-advised & are not protection the public from infection.
Their standards suck.
Public Health and medical administrators have NO IDEA how to deal with #measles. They deal with disease based on "vibes". That won't work.
We need new people to deal with this.
We need new people to deal with this.
When faced with a capital-A Airborne community outbreak of measles Norfolk General Hospital in Ontario, Canada rolls out the same masking policy it uses for influenza and COVID-19, including maskoptional places like hallways, cafeteria, and hospital units that are not in outbreak.
March 4, 2025 at 11:58 AM
Norfolk measles outbreak (incubation time of 21 days) will likely start to see increased +ve cases during March Break.
Bigger than the outbreak in Texas already😓
#N95orbetter
#CRboxes
#⬆️ventilation
Public Health is ill-advised & are not protection the public from infection.
Their standards suck.
Bigger than the outbreak in Texas already😓
#N95orbetter
#CRboxes
#⬆️ventilation
Public Health is ill-advised & are not protection the public from infection.
Their standards suck.
They’re DIY air purifiers that are way more efficient and affordable than any HEPA filters you can buy on the market reddit.com/r/crboxes
They’re mainly used in schools but as hospitals now also stopped using masks ppl build portable ones to take to the doctor
wikipedia.org/wiki/Corsi–Rosenthal_Box
They’re mainly used in schools but as hospitals now also stopped using masks ppl build portable ones to take to the doctor
wikipedia.org/wiki/Corsi–Rosenthal_Box
Corsi–Rosenthal Box - Wikipedia
https://en.m.wikipedia.org/wiki/Corsi–Rosenthal_Box
May 1, 2023 at 6:42 PM
They’re DIY air purifiers that are way more efficient and affordable than any HEPA filters you can buy on the market reddit.com/r/crboxes
They’re mainly used in schools but as hospitals now also stopped using masks ppl build portable ones to take to the doctor
wikipedia.org/wiki/Corsi–Rosenthal_Box
They’re mainly used in schools but as hospitals now also stopped using masks ppl build portable ones to take to the doctor
wikipedia.org/wiki/Corsi–Rosenthal_Box
This happened after I had already caught COVID due to lack of public health safeguards/policies & hazardous guidance.
The mechanical ventilation/filtration upgrades are NOT enough to prevent airborne pathogen spread due to crowded classrooms.
Schools are still unsafe in this respect.
#N95+
#CRboxes
The mechanical ventilation/filtration upgrades are NOT enough to prevent airborne pathogen spread due to crowded classrooms.
Schools are still unsafe in this respect.
#N95+
#CRboxes
January 17, 2025 at 2:25 PM
If I could go back in time to speak to myself one year ago, then I would say, " You have always been doing the right thing by wearing your Q100 at work, and cleaning the indoor air with #CRboxes."
I would've also said to get a Doppler ultrasound of my neck & legs. It might have prevented my MI.
I would've also said to get a Doppler ultrasound of my neck & legs. It might have prevented my MI.
June 30, 2025 at 12:52 AM
If I could go back in time to speak to myself one year ago, then I would say, " You have always been doing the right thing by wearing your Q100 at work, and cleaning the indoor air with #CRboxes."
I would've also said to get a Doppler ultrasound of my neck & legs. It might have prevented my MI.
I would've also said to get a Doppler ultrasound of my neck & legs. It might have prevented my MI.
We save the most money right now by purchasing Ikea Uppatvïnd filters, and building smaller, table top #CRBoxes with 2 adjacent PC fans/filter. Very efficient for cleaning air & quieter than the big fan models (we use both, but set the large fan models on low speed due to noise)
May 13, 2025 at 7:34 PM
We save the most money right now by purchasing Ikea Uppatvïnd filters, and building smaller, table top #CRBoxes with 2 adjacent PC fans/filter. Very efficient for cleaning air & quieter than the big fan models (we use both, but set the large fan models on low speed due to noise)
Looking at last year's class data compared to this year's absenteeism there has been about a 30% reduction in absences.
Why?
Cleaner indoor air, more informed children willing to act to help clean their air (wear N95s), more tabletop #CRboxes.
What could boards do to help? Reduce class sizes...
Why?
Cleaner indoor air, more informed children willing to act to help clean their air (wear N95s), more tabletop #CRboxes.
What could boards do to help? Reduce class sizes...
September 26, 2025 at 2:18 AM
Looking at last year's class data compared to this year's absenteeism there has been about a 30% reduction in absences.
Why?
Cleaner indoor air, more informed children willing to act to help clean their air (wear N95s), more tabletop #CRboxes.
What could boards do to help? Reduce class sizes...
Why?
Cleaner indoor air, more informed children willing to act to help clean their air (wear N95s), more tabletop #CRboxes.
What could boards do to help? Reduce class sizes...
Thanks to @corsiaq.bsky.social , Dr. Rosenthal, Rob Wiss & so many others, we have many amazing design ideas for #CRboxes 🙌🙌
photos.app.goo.gl/QSc67keCyXAa...
Why not custom make them within pre-existing furniture🙌
photos.app.goo.gl/QSc67keCyXAa...
Why not custom make them within pre-existing furniture🙌
November 19, 2024 at 1:06 AM
Thanks to @corsiaq.bsky.social , Dr. Rosenthal, Rob Wiss & so many others, we have many amazing design ideas for #CRboxes 🙌🙌
photos.app.goo.gl/QSc67keCyXAa...
Why not custom make them within pre-existing furniture🙌
photos.app.goo.gl/QSc67keCyXAa...
Why not custom make them within pre-existing furniture🙌
I've been reviewing attendance statistics re: student illness for September.
There was a confirmed case of COVID reported in my classroom (never disclosed to me - I had to look it up myself😓).
Even with a +ve case in my classroom, our free N95s & desktop #CRboxes prevented rampant spread...
There was a confirmed case of COVID reported in my classroom (never disclosed to me - I had to look it up myself😓).
Even with a +ve case in my classroom, our free N95s & desktop #CRboxes prevented rampant spread...
September 26, 2025 at 1:59 AM
I've been reviewing attendance statistics re: student illness for September.
There was a confirmed case of COVID reported in my classroom (never disclosed to me - I had to look it up myself😓).
Even with a +ve case in my classroom, our free N95s & desktop #CRboxes prevented rampant spread...
There was a confirmed case of COVID reported in my classroom (never disclosed to me - I had to look it up myself😓).
Even with a +ve case in my classroom, our free N95s & desktop #CRboxes prevented rampant spread...
So so true.
COVID levels the playing field.
Doesn't matter how fit you are, or how well you eat.
COVID will still cause vascular damage to healthy individuals that can quickly become life-threatening.
I'm VERY lucky I survived my MI.
Prevent COVID infection!
#N95+
#CRboxes
#GetVaccinated
COVID levels the playing field.
Doesn't matter how fit you are, or how well you eat.
COVID will still cause vascular damage to healthy individuals that can quickly become life-threatening.
I'm VERY lucky I survived my MI.
Prevent COVID infection!
#N95+
#CRboxes
#GetVaccinated
If you are a person who loves being fit and healthy and toned, I can tell you that it would probably be better for you to eat a whole large pizza every single day of your life than to get long covid.
January 30, 2025 at 3:08 AM
So so true.
COVID levels the playing field.
Doesn't matter how fit you are, or how well you eat.
COVID will still cause vascular damage to healthy individuals that can quickly become life-threatening.
I'm VERY lucky I survived my MI.
Prevent COVID infection!
#N95+
#CRboxes
#GetVaccinated
COVID levels the playing field.
Doesn't matter how fit you are, or how well you eat.
COVID will still cause vascular damage to healthy individuals that can quickly become life-threatening.
I'm VERY lucky I survived my MI.
Prevent COVID infection!
#N95+
#CRboxes
#GetVaccinated
Here is our data at the end of our ~2hr tracking period.
#CRboxes assisted in consistent,effective removal of 91-93% of PM2.5 particulate even under additional stress (e.g., Outside PM2.5 ⬆️ by 7, indoor only went up 2 at the most)
CO2 ppm stayed at or below 600 ppm in the classroom.
Keep kids safe.
#CRboxes assisted in consistent,effective removal of 91-93% of PM2.5 particulate even under additional stress (e.g., Outside PM2.5 ⬆️ by 7, indoor only went up 2 at the most)
CO2 ppm stayed at or below 600 ppm in the classroom.
Keep kids safe.
June 6, 2025 at 2:17 PM
Here is our data at the end of our ~2hr tracking period.
#CRboxes assisted in consistent,effective removal of 91-93% of PM2.5 particulate even under additional stress (e.g., Outside PM2.5 ⬆️ by 7, indoor only went up 2 at the most)
CO2 ppm stayed at or below 600 ppm in the classroom.
Keep kids safe.
#CRboxes assisted in consistent,effective removal of 91-93% of PM2.5 particulate even under additional stress (e.g., Outside PM2.5 ⬆️ by 7, indoor only went up 2 at the most)
CO2 ppm stayed at or below 600 ppm in the classroom.
Keep kids safe.
Schools truly are not the safest places for children.
Why? Too many bodies in limited, indoor spaces promotes airborne pathogen spread.
Class sizes & school buses are the biggest threats to student health.
We use desktop #CRboxes in our classroom to help reduce close-contact spread to some degree...
Why? Too many bodies in limited, indoor spaces promotes airborne pathogen spread.
Class sizes & school buses are the biggest threats to student health.
We use desktop #CRboxes in our classroom to help reduce close-contact spread to some degree...
July 4, 2025 at 11:29 AM
Schools truly are not the safest places for children.
Why? Too many bodies in limited, indoor spaces promotes airborne pathogen spread.
Class sizes & school buses are the biggest threats to student health.
We use desktop #CRboxes in our classroom to help reduce close-contact spread to some degree...
Why? Too many bodies in limited, indoor spaces promotes airborne pathogen spread.
Class sizes & school buses are the biggest threats to student health.
We use desktop #CRboxes in our classroom to help reduce close-contact spread to some degree...
With the Pacific Northwest in fire mode, have a reminder that masks and CR boxes and filter fans can all make breathing a little easier indoors and out! (And seriously, stay safe everyone!)
And here's a great roundup of DIY tutorials and ready made CR boxes! www.reddit.com/r/crboxes/co...
And here's a great roundup of DIY tutorials and ready made CR boxes! www.reddit.com/r/crboxes/co...
From the crboxes community on Reddit: DIY or Buy Guide for CR Boxes
Explore this post and more from the crboxes community
www.reddit.com
September 8, 2025 at 12:36 AM
With the Pacific Northwest in fire mode, have a reminder that masks and CR boxes and filter fans can all make breathing a little easier indoors and out! (And seriously, stay safe everyone!)
And here's a great roundup of DIY tutorials and ready made CR boxes! www.reddit.com/r/crboxes/co...
And here's a great roundup of DIY tutorials and ready made CR boxes! www.reddit.com/r/crboxes/co...
I've now been illness free since August 2023 due to current protocols. Due to lack of government health & safety support, I've relied heavily on the help of experts through social media.
What works?
-N95+ in all public indoor spaces
-Norizite & Viraleze together
-#CRboxes
-probiotics
-curcumin
What works?
-N95+ in all public indoor spaces
-Norizite & Viraleze together
-#CRboxes
-probiotics
-curcumin
November 21, 2024 at 11:30 AM
I've now been illness free since August 2023 due to current protocols. Due to lack of government health & safety support, I've relied heavily on the help of experts through social media.
What works?
-N95+ in all public indoor spaces
-Norizite & Viraleze together
-#CRboxes
-probiotics
-curcumin
What works?
-N95+ in all public indoor spaces
-Norizite & Viraleze together
-#CRboxes
-probiotics
-curcumin
I work with grade 6 students. Our classroom is a lab in which we learn about ON curriculum including the importance of ventilation and filtration experimentation, airborne pathogens, general health and safety, and environmental stewardship.
We build & use #CRboxes too🙌
#TeachSDGs
We build & use #CRboxes too🙌
#TeachSDGs
October 18, 2024 at 10:05 AM
I work with grade 6 students. Our classroom is a lab in which we learn about ON curriculum including the importance of ventilation and filtration experimentation, airborne pathogens, general health and safety, and environmental stewardship.
We build & use #CRboxes too🙌
#TeachSDGs
We build & use #CRboxes too🙌
#TeachSDGs
I've never stopped wearing my Q100 & cleaning the indoor air around me.
COVID nearly killed me in January.
Its not a joke.
Prevent infection. Wear an N95 or better. Filter indoor air with #CRboxes & HEPA units.
Open windows/doors for better ventilation.
We know how to prevent infection.
#JustDoIt
COVID nearly killed me in January.
Its not a joke.
Prevent infection. Wear an N95 or better. Filter indoor air with #CRboxes & HEPA units.
Open windows/doors for better ventilation.
We know how to prevent infection.
#JustDoIt
Hey listen, covid is really heating up again. I know it sucks. You'll get no judgement from me if you haven't been masking, but now's the time to pull some back out.
You don't want long covid. It sucks way worse than masking.
You don't want long covid. It sucks way worse than masking.
August 11, 2025 at 2:33 AM
Didn't take long from there. By Oct 2022, with the help of @robwissink.bsky.social I had constructed many, affordable, PC-fan, #CRboxes out of foamboard. They were all whisper quiet & VERY effective at removing airborne pathogens from the classroom.
June 30, 2025 at 2:20 AM
Didn't take long from there. By Oct 2022, with the help of @robwissink.bsky.social I had constructed many, affordable, PC-fan, #CRboxes out of foamboard. They were all whisper quiet & VERY effective at removing airborne pathogens from the classroom.