$4 provides clean air for 1 student for an entire year. $100 provides clean air for a classroom for a year. We are 15% of the way to our goal of raising $25,000. Please help us provide clean air for more children & teachers. DONATE: givebutter.com/buildabox2025 #GivingTuesday

Our biggest week yet!! We are thrilled to have the resources to approve 7 new grants this week, totaling 275 CR Boxes. That is clean air for approx. 10,000 kids & community members. Please DONATE to help us continue: givebutter.com/buildabox2025

What a sweet memory from 2023! ❤️ @crfoundationus.bsky.social corsirosenthalfoundation.org/showcase/pro...

Just this month, the @CRFoundationUS has received applications for 275 CR boxes to be deployed to 7 schools & community centers. That is clean air for thousands & thousands of people. Please help us meet these needs.🙏🙏 Donate now: givebutter.com/buildabox2025

More and more people around the world are talking about the importance of clean air! Join the movement and donate today and help us reach our goal of getting clean air to 10,000 students! Donate today: givebutter.com/buildabox2025

🥹Look at our elders keeping their community healthy🥹 This is Air Alliance Houston building CR Boxes. If you are inspired by these folks, please donate so we can sponsor more events like this: givebutter.com/buildabox2025

Is your air cleaner a money suck? ⬆️up front cost ⬆️cost of replacement filters The CR box is a fraction of the cost of other units, with greater efficacy. It just moves SO much air, providing mixing and many more passes through the filters. Can your air cleaner do this?⤵️

Please post a photo of your Corsi-Rosenthal Box if you are decorating one or more for Halloween. @crfoundationus.bsky.social

Please help out the Corsi-Rosenthal Foundation, it's already done so much good in the world!!

Please consider donating. As we know this is an indoor pandemic and to give our kids the best chance is to clean the air in the schools using air filters if their IAQ is subpar(which most are 🥺) I have built countless Corsi boxes over these past 5 yrs and they have kept us safer! #CleanTheAirWeShare

Check out these adorable CR box earrings made by an 8yo. Such creativity. The young ones continue to inspire us, and motivate us to do better to protect them.

Many of you have been with us from the beginning, as champions for clean air. We have put thousands of CR boxes into schools & community spaces across the country. Help us continue the movement making clean air accessible to all by donating today: givebutter.com/buildabox2025

This week's top fan is a soon-to-be Eagle Scout who has decided to do his big Eagle Project on building and donating CR Boxes to a local school with data showing poor indoor air quality. The youth are fired up about IAQ. And we are here for it!

directions for filtering indoor air

Hope this is the start of many more schools (*+ daycares) using air filters, in UK + beyond. One option: @crfoundationus.bsky.social filters are inexpensive and EFFECTIVE. We need to protect children + those who care for them. This works. @mark-carney.bsky.social x.com/SadiqKhan/st...

Research says ... CR boxes are: - effective - quiet - durable - easy to move - not a distraction to teachers or students If you want to get CR Boxes into your classroom, the CR Foundation can give you all the supplies ... for FREE. Apply for a grant today: corsirosenthalfoundation.org/apply/

How many CR Boxes do you need for a particular space? Check out our new handy charts to help gauge your needs for: - school settings - residential settings *Notice the guidance is different based on your goals: - mitigating wildfire smoke - mitigating bioaerosols

We are looking forward to participating in this Global IAQ event next week at UN Headquarters in NYC. We will be joining orgs from around the world to address the need for clean indoor air. Register here 🔽 to watch the event from anywhere: bit.ly/461pNPq

“By coming together to build these purifiers, neighbors are taking a meaningful step toward ensuring that children and educators have a safer, cleaner place to learn and grow.” Read how Safe Streets Wichita used our grant process to build CR boxes. www.communityvoiceks.com/2025/08/01/d...

🥳The Corsi-Rosenthal Foundation is celebrating the donation of our 2,000th CR Box.🥳 That is A LOT of clean air ... all thanks to your generous donations that allow us to do this work. Thank you! Feel free to join our efforts by donating here: corsirosenthalfoundation.org/donate/

Check out these amazing kids teaching 🔥🚒🧑‍🚒fire fighters🔥🚒🧑‍🚒 how to make a Corsi-Rosenthal Box to clean their indoor air. Fire fighters are exposed to horrendous amounts of particulate matter. The students captured 102 pgs of data to analyze! www.avfire.org/red-rock-gat...

💥NEW RESOURCE💥 We're excited to share a new BIG BUILD GUIDE to help those who are building a large quantity of CR Boxes. It's an amazing combination of: - tips - printable instructions - editable files Check it out: corsirosenthalfoundation.org/instructions/

Thanks @usepa.bsky.social for including us in the team of Air Cleaning Allies super heroes! Check out their new Activity Book for kids to learn about the importance of clean indoor air and ways to improve IAQ. Give DJ a ❤️!! Download it here: www.epa.gov/system/files...

Want to get [FREE] Corsi-Rosenthal Boxes in your child's school this year? We've created an email you can share with the school principal to make the process easier. You can access it through the link on STEP 2 of our grant process. corsirosenthalfoundation.org/apply/ Please share!

Inspired by our friends in Kansas who are doing amazing work to get clean air in classrooms in Wichita. Grateful to be able to do our part to contribute all the supplies. Check out this news story about their project: www.kake.com/community/lo...

Tune in to this 11-minute interview with Dr. Richard Corsi on Canadian radio. How a DIY air purifier can help deal with wildfire smoke. @corsiaq.bsky.social Affordability - Accessibility - Efficiency They continue to be our driving values. www.cbc.ca/listen/live-... Pic of the OG.

This week's update: 12 CR boxes granted to heat relief and respite centers in the Phoenix, AZ area. @airsupportproject.bsky.social Back-to-school season is upon us. Be sure you are following us to get updates on all our new resources to help kids and teachers have cleaner air this school year.

This week's Top Fan is our friends at @airsupportproject.bsky.social . Their VP, Melissa Smallwood, built CR boxes to be placed in heat relief centers around Phoenix, AZ. These cooling & respite centers ease one public health crisis. Happy to minimize the impacts of other crises.

This week's update: 12 more CR Boxes deployed to schools and community centers around the US. We are working hard to get ready for back-to-school season! Please consider donating $$ so we can get clean air in as many classrooms as possible. Donate here: corsirosenthalfoundation.org/donate/

This week's Top Fan!! The Ohio Clean Air Coalition recently received a grant from us. They gathered, built, and distributed several CR boxes to public spaces in their community! We are honored to have played a small part in this story.

Another great week of helping folks access cleaner indoor air. Be sure to follow us and RT. We've got A LOT of new resources to share in preparation for back-to-school season. @corsiaq.bsky.social @polsiewski.bsky.social @jimrosenthal5.bsky.social @jaydocovid.bsky.social @jehnml.bsky.social

Drop a 👋 below to say hi to Liesl McConchie (@Liesl4CleanAir.bluesky.social), our new interim Executive Director for the Corsi-Rosenthal Foundation. We are thrilled to have Liesl's energy and expertise on board as we deliver cleaner air to improve human health.

Wildfire smoke is covering large areas of the US. Time to make a Corsi-Rosenthal Box. They work! www.spokesman.com/stories/2025...

Check out Mark Robinson from @weathernetwork.bsky.social making a #CorsiRosenthal box filter - www.theweathernetwork.com/en/video/99J... @corsiaq.bsky.social @crfoundationus.bsky.social

Tornadoes devastated many areas of St. Louis & we are mobilizing to provide DIY air filters to combat “Tornado Lung,” a serious respiratory threat. We are committing $2.5k and raising another $2.5k. Please share & donate: tinyurl.com/CRFSTL2025 In partnership with @maskblocstlouis.bsky.social

The BC Wildfire Research group did tests to develop a "clean air shelter" for firefighters. One test used a 14'X24' Ranger tent. They attached a MERV 13 CR box onto the tent - facing in. The positive pressure from the fan and the CR Box filters reduced PM 2.5 by 91%! Ingenuity triumphs again!

Needed some motivation today and so went back and watched this wonderful video made by a teacher and her students in Round Rock Arizona, recipients of a grant from the Corsi-Rosenthal Foundation. Worth a watch! www.youtube.com/watch?v=dUYL...

3/ However, for the first 4 years of this (ongoing) pandemic, we used DIY air cleaners, courtesy of @crfoundationus.bsky.social. And I still highly recommend #CorsiRosenthalBoxes, make, & give them away. And will do this indefinitely -

Nice article on friend & CR Foundation co-founder Jim Rosenthal. I am so proud of Jim for his altruism and kindness, and for efforts of the CR Foundation Board of Directors to provide healthier indoor air for schools in underserved communities. 💙 thepeak.coloradocollege.edu/2025/04/22/j...

We spend 90% of our time indoors, where #IndoorAirQuality affects our health every day. Dust, allergens and airborne illnesses build up, but a simple, affordable DIY solution — co-designed by @corsiaq.bsky.social — can help. See how to make one at youtu.be/1aMOtwcmvpo

At #MaskTogetherAmerica Clean Air Emergency Q&A, Liesl @lieslmcconchie.bsky.social CleanAirAllies.org talked about how US indoor air quality regulations for schools evolved and became sufficient only to mitigate “odors.” Yikes.😬 MC: @christinaauriana.bsky.social @crfoundationus.bsky.social

Wow! Thanks @ucdavisenergy.bsky.social for this excellent video - although now I see myself as a puppet in a Jack in the Box toy 😅. The video is to point, scientifically accessible & defensible, Hope it helps some improve their IAQ. It's not rocket science, folks! @crfoundationus.bsky.social

I am so proud of our Foundation and the effects we are having on schools across the US. These wonderful young students and their awesome teacher at Red Rock Elementary made a video for us to share. I feel like we are standing on the shoulders of future giants! 👇

Outstanding video on the success of Red Rock Elementary in building Corsi-Rosenthal Boxes. Many thanks to this great teacher and her students. Others can do the same. Just apply for a grant!

Hear how frequent illness and poor air quality posed major problems for students at Red Rock Elementary, and how Corsi-Rosenthal Boxes boosted their health and ability to learn. Learn more at: CleanAirK12.com CorsiRosenthalFoundation.org #CRBox #CleanAirK12 Full Video: youtu.be/dUYLPUfkv0g

Any recent PhD (2023 or later) aerosol scientists out there interested in studying airborne transmission of respiratory infections? My group is looking for a postdoc to work on human challenge studies with influenza virus at Emory University. Full description at drive.google.com/file/d/1HzJZ...

🚨 Speaker Alert! 🚨 Join Dr. Paula Olsiewski, trailblazer in microbiology & biosecurity, at our Leadership in Indoor Air Webinar! Gain insights from Dr. Olsiewski on March 3, 2025, 4-5pm EST, free for ISIAQ members. Register now: www.isiaq.org/leadership_i... #IAQ

This translates to roughly $3 per student per year (< a small American coffee/student/year). It costs on average $13K/year to educate one student in the US. For an extra $3 we could significantly lower flu and COVID cases in schools. More ...

It would cost $160M per year to retrofit EVERY public K-12 classroom in the US with a Corsi-Rosenthal Box (and students could learn by helping to build them). Estimate includes capital cost, filter replacement, duct tape and electricity, w/ 3-year average. More ... www.today.com/health/cold-...

Appreciative of the media coverage on Corsi-Rosenthal Foundation efforts. One correction (glitch in article). 3M provided MERV-13 and not MERV-8 filters (a big difference in effectiveness of removing wildfire smoke or even respiratory aerosols). fortworthreport.org/2025/02/05/h...