Clean Air Stars
@cleanairstars.com
Non-profit. Helping businesses better protect their customers from viruses like SARS-CoV-2. Fix your air with the guides cleanairstars.com/steps.
Air filter recommendation tool (non-profit) at filters.cleanairstars.com
Air filter recommendation tool (non-profit) at filters.cleanairstars.com
Pinned
Clean Air Stars
@cleanairstars.com
· Nov 16
The “Clean Air”
bluesky feed algorithm is slowly improving over time to ensure relevant and useful posts appear.
It takes time to assess the sensitivity and specificity of certain phrases.
You can follow it here.
bsky.app/profile/did:...
bluesky feed algorithm is slowly improving over time to ensure relevant and useful posts appear.
It takes time to assess the sensitivity and specificity of certain phrases.
You can follow it here.
bsky.app/profile/did:...
Reposted by Clean Air Stars
Great to visit St Mary’s Primary School in Battersea today - one of the first schools to receive indoor air quality filters as part of my initiative to improve children’s health.
More than 200 schools will be getting indoor air quality filters soon.
More than 200 schools will be getting indoor air quality filters soon.
October 17, 2025 at 4:07 PM
Great to visit St Mary’s Primary School in Battersea today - one of the first schools to receive indoor air quality filters as part of my initiative to improve children’s health.
More than 200 schools will be getting indoor air quality filters soon.
More than 200 schools will be getting indoor air quality filters soon.
Reposted by Clean Air Stars
@london.gov.uk is delivering on his pledge to improve air quality in classrooms today, launching a £2.7m programme installing indoor air filters in 200 schools across London — benefitting tens of thousands of children & marking another step towards a greener London. www.london.gov.uk/mayor-invest...
October 17, 2025 at 9:58 AM
@london.gov.uk is delivering on his pledge to improve air quality in classrooms today, launching a £2.7m programme installing indoor air filters in 200 schools across London — benefitting tens of thousands of children & marking another step towards a greener London. www.london.gov.uk/mayor-invest...
Reposted by Clean Air Stars
Clean air is a social justice issue ⤵️
That’s why City Hall is targeting £2.7m in London areas with poorer air quality and higher deprivation.
By providing more than 200 schools with air filters, we’ll help tens of thousands of children breathe cleaner air.
That’s why City Hall is targeting £2.7m in London areas with poorer air quality and higher deprivation.
By providing more than 200 schools with air filters, we’ll help tens of thousands of children breathe cleaner air.
October 17, 2025 at 7:54 PM
Clean air is a social justice issue ⤵️
That’s why City Hall is targeting £2.7m in London areas with poorer air quality and higher deprivation.
By providing more than 200 schools with air filters, we’ll help tens of thousands of children breathe cleaner air.
That’s why City Hall is targeting £2.7m in London areas with poorer air quality and higher deprivation.
By providing more than 200 schools with air filters, we’ll help tens of thousands of children breathe cleaner air.
Reposted by Clean Air Stars
Having a bit of a reminisce today. Five years ago an email arrived that changed my life - a request to produce a paper on what we knew about the environmental transmission of covid-19 for the UK SAGE committee. 1/
April 7, 2025 at 6:35 PM
Having a bit of a reminisce today. Five years ago an email arrived that changed my life - a request to produce a paper on what we knew about the environmental transmission of covid-19 for the UK SAGE committee. 1/
Reposted by Clean Air Stars
Reposted by Clean Air Stars
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...
MarrPostdocAd20250219.pdf
drive.google.com
February 20, 2025 at 7:54 PM
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...
Reposted by Clean Air Stars
🧪Our new paper measuring the bio inactivation by Far UVC is out. We look at ventilation rate, two bacteria (S aureus, P aeruginosa) and some initial tests on distance www.sciencedirect.com/science/arti... 1/
Experimental analysis to quantify inactivation of microorganisms by Far-UVC irradiation in indoor environments.
Far-UVC irradiation at a 222 nm wavelength is a promising technology for inactivating microorganisms in indoor environments to mitigate transmission o…
www.sciencedirect.com
February 18, 2025 at 9:33 AM
🧪Our new paper measuring the bio inactivation by Far UVC is out. We look at ventilation rate, two bacteria (S aureus, P aeruginosa) and some initial tests on distance www.sciencedirect.com/science/arti... 1/
Reposted by Clean Air Stars
Several small air purifiers may be a better solution than one large one. You might think that this would improve the homogeneity of filtration in a room. But we've also built large purifiers to carry out a few tests, like this model with a capacity of 450 m3/h.
February 19, 2025 at 6:34 AM
Several small air purifiers may be a better solution than one large one. You might think that this would improve the homogeneity of filtration in a room. But we've also built large purifiers to carry out a few tests, like this model with a capacity of 450 m3/h.
Reposted by Clean Air Stars
Our latest paper on the efficacy of germicidal UV radiation just landed at Journal of Hazardous Materials.
Thank-you JHM for a smooth peer review process.
doi.org/10.1016/j.jh...
Thank-you JHM for a smooth peer review process.
doi.org/10.1016/j.jh...
doi.org
January 23, 2025 at 1:50 AM
Our latest paper on the efficacy of germicidal UV radiation just landed at Journal of Hazardous Materials.
Thank-you JHM for a smooth peer review process.
doi.org/10.1016/j.jh...
Thank-you JHM for a smooth peer review process.
doi.org/10.1016/j.jh...
Reposted by Clean Air Stars
Free webinar “improving air quality in schools. What can we do?”
Free to sign up. For teachers, parents, students, and anyone interested in improving the classroom.
events.teams.microsoft.com/event/7d54c6...
Free to sign up. For teachers, parents, students, and anyone interested in improving the classroom.
events.teams.microsoft.com/event/7d54c6...
February 7, 2025 at 9:23 AM
Free webinar “improving air quality in schools. What can we do?”
Free to sign up. For teachers, parents, students, and anyone interested in improving the classroom.
events.teams.microsoft.com/event/7d54c6...
Free to sign up. For teachers, parents, students, and anyone interested in improving the classroom.
events.teams.microsoft.com/event/7d54c6...
Reposted by Clean Air Stars
For all #ventilation fans, the Future Urban Ventilation Network @breathingcity.bsky.social has just joined Bluesky. Follow for events and updates around ventilation and IAQ from the network.
February 11, 2025 at 3:06 PM
For all #ventilation fans, the Future Urban Ventilation Network @breathingcity.bsky.social has just joined Bluesky. Follow for events and updates around ventilation and IAQ from the network.
Reposted by Clean Air Stars
We’re launching our Invisible Inclusion program! We’re seeking founding partners to co-design this initiative that helps businesses become safer, healthier, and more inclusive for employees and customers with chronic health conditions.
Learn more: 🎥 youtu.be/3nrpPM7OoBk
Learn more: 🎥 youtu.be/3nrpPM7OoBk
Invisible inclusion
YouTube video by The Safer Air Project
youtu.be
February 13, 2025 at 4:26 AM
We’re launching our Invisible Inclusion program! We’re seeking founding partners to co-design this initiative that helps businesses become safer, healthier, and more inclusive for employees and customers with chronic health conditions.
Learn more: 🎥 youtu.be/3nrpPM7OoBk
Learn more: 🎥 youtu.be/3nrpPM7OoBk
Reposted by Clean Air Stars
From a single data point (e.g. high CO2), you can’t know the ventilation rate. The rate that the CO2 changes over time is required. That said, it can tell you something. For example, if the room is crowded and the CO2 is low, you can assume that the ventilation must be pretty good.
February 2, 2025 at 12:18 PM
From a single data point (e.g. high CO2), you can’t know the ventilation rate. The rate that the CO2 changes over time is required. That said, it can tell you something. For example, if the room is crowded and the CO2 is low, you can assume that the ventilation must be pretty good.
Reposted by Clean Air Stars
Thread for those new to BlueSky. First of all, welcome. It feels like a safer space, doesn’t it? But also perhaps a bit disorienting initially? Here’s some tips for getting your bearings.
November 13, 2024 at 5:59 PM
Thread for those new to BlueSky. First of all, welcome. It feels like a safer space, doesn’t it? But also perhaps a bit disorienting initially? Here’s some tips for getting your bearings.
Reposted by Clean Air Stars
No, SARS-CoV-2 isn’t a little bit airborne. It’s not “situationally” airborne. It’s an AIRBORNE VIRUS, spreads via the air. I’m granting an amnesty on people who said (5y ago) that it wasn’t. I won’t say I told you so if you finally acknowledge the evidence. Let’s just get this right and move on.
January 17, 2025 at 5:36 PM
No, SARS-CoV-2 isn’t a little bit airborne. It’s not “situationally” airborne. It’s an AIRBORNE VIRUS, spreads via the air. I’m granting an amnesty on people who said (5y ago) that it wasn’t. I won’t say I told you so if you finally acknowledge the evidence. Let’s just get this right and move on.
Reposted by Clean Air Stars
Latest from Vic health dept SM:
Credit for acknowledging airborne transmission & educating about the importance of ventilation 👍
Nb: given they acknowledge transmission is airborne, advice to wear a respirator when ventilation is not optimal (eg crowded public indoor spaces) would’ve been helpful
Credit for acknowledging airborne transmission & educating about the importance of ventilation 👍
Nb: given they acknowledge transmission is airborne, advice to wear a respirator when ventilation is not optimal (eg crowded public indoor spaces) would’ve been helpful
January 12, 2025 at 11:52 PM
Latest from Vic health dept SM:
Credit for acknowledging airborne transmission & educating about the importance of ventilation 👍
Nb: given they acknowledge transmission is airborne, advice to wear a respirator when ventilation is not optimal (eg crowded public indoor spaces) would’ve been helpful
Credit for acknowledging airborne transmission & educating about the importance of ventilation 👍
Nb: given they acknowledge transmission is airborne, advice to wear a respirator when ventilation is not optimal (eg crowded public indoor spaces) would’ve been helpful
Reposted by Clean Air Stars
Many manufacturers will inflate room sizes and CADR figures.
Before you buy an air purifier, always check the actual CADR figures and the recommended room size.
Visit the ENERGYSTAR database www.energystar.gov/productfinde...
Or check the @cleanairstars.com tool filters.cleanairstars.com
Before you buy an air purifier, always check the actual CADR figures and the recommended room size.
Visit the ENERGYSTAR database www.energystar.gov/productfinde...
Or check the @cleanairstars.com tool filters.cleanairstars.com
Product Finder — ENERGY STAR Certified Room Air Cleaners
Compare ENERGY STAR Certified Room Air Cleaners, find rebates, and learn more.
www.energystar.gov
January 14, 2025 at 12:02 PM
Many manufacturers will inflate room sizes and CADR figures.
Before you buy an air purifier, always check the actual CADR figures and the recommended room size.
Visit the ENERGYSTAR database www.energystar.gov/productfinde...
Or check the @cleanairstars.com tool filters.cleanairstars.com
Before you buy an air purifier, always check the actual CADR figures and the recommended room size.
Visit the ENERGYSTAR database www.energystar.gov/productfinde...
Or check the @cleanairstars.com tool filters.cleanairstars.com
Reposted by Clean Air Stars
The total views on the channel is approaching 10k, which is pretty wild for a channel dedicated to explaining how aerosol affects human health.
January 12, 2025 at 8:33 PM
The total views on the channel is approaching 10k, which is pretty wild for a channel dedicated to explaining how aerosol affects human health.
Reposted by Clean Air Stars
Great paper on the theory of why not-HEPA is actually better. It makes two assumptions that I think need to be updated. My guess is with electret media, 90% is probably target
1. Doesn't consider electrostatic filter media
2. That blower efficiency curves are fixed, but still good first order est.
1. Doesn't consider electrostatic filter media
2. That blower efficiency curves are fixed, but still good first order est.
Steve Rudnick described the theory behind this phenomenon in a paper in Aerosol Science and Technology in 2004. For submicron particles, he estimated that 82% efficiency was optimal.
www.tandfonline.com/doi/abs/10.1...
www.tandfonline.com/doi/abs/10.1...
December 5, 2024 at 5:08 PM
Great paper on the theory of why not-HEPA is actually better. It makes two assumptions that I think need to be updated. My guess is with electret media, 90% is probably target
1. Doesn't consider electrostatic filter media
2. That blower efficiency curves are fixed, but still good first order est.
1. Doesn't consider electrostatic filter media
2. That blower efficiency curves are fixed, but still good first order est.
Reposted by Clean Air Stars
[1/2] All that matters is CADR! Ignore things super-hyper-mega HEPA. Often times a filter that only provides 70-80% actually provides more clean air than a filter that is 99.97%(HEPA). I used a 16x20 3M filter taped to a Taotronic AP-003(with no internal HEPA installed) and got a 30% boost in CADR.
December 1, 2024 at 10:46 PM
[1/2] All that matters is CADR! Ignore things super-hyper-mega HEPA. Often times a filter that only provides 70-80% actually provides more clean air than a filter that is 99.97%(HEPA). I used a 16x20 3M filter taped to a Taotronic AP-003(with no internal HEPA installed) and got a 30% boost in CADR.
Reposted by Clean Air Stars
This paper from 20 years ago has the math and theory for an greatly improved air cleaner design at ~80% filtration that has turned out to be correct. The "must be HEPA 99.97% filtration" is hard to overcome.
Steve Rudnick described the theory behind this phenomenon in a paper in Aerosol Science and Technology in 2004. For submicron particles, he estimated that 82% efficiency was optimal.
www.tandfonline.com/doi/abs/10.1...
www.tandfonline.com/doi/abs/10.1...
December 5, 2024 at 12:03 PM
This paper from 20 years ago has the math and theory for an greatly improved air cleaner design at ~80% filtration that has turned out to be correct. The "must be HEPA 99.97% filtration" is hard to overcome.
Reposted by Clean Air Stars
Steve Rudnick described the theory behind this phenomenon in a paper in Aerosol Science and Technology in 2004. For submicron particles, he estimated that 82% efficiency was optimal.
www.tandfonline.com/doi/abs/10.1...
www.tandfonline.com/doi/abs/10.1...
December 5, 2024 at 4:48 AM
Steve Rudnick described the theory behind this phenomenon in a paper in Aerosol Science and Technology in 2004. For submicron particles, he estimated that 82% efficiency was optimal.
www.tandfonline.com/doi/abs/10.1...
www.tandfonline.com/doi/abs/10.1...
Reposted by Clean Air Stars
The Midea is found in Europe, the Lago is found in the U.S.
We opened up both of them (and the AP003) and found the model KJ-350G-S1 stamped across all three. Same model with a license to be rebranded and sold.
Danny shared how it works starting at this point of the video youtu.be/HwrAv4Vah0s?...
We opened up both of them (and the AP003) and found the model KJ-350G-S1 stamped across all three. Same model with a license to be rebranded and sold.
Danny shared how it works starting at this point of the video youtu.be/HwrAv4Vah0s?...
Our BEST CHEAP Air Purifier is DISCONTINUED, NOW WHAT?!?! - TaoTronics AP003 - Lago - Midea Review
YouTube video by HouseFresh
youtu.be
December 4, 2024 at 8:31 AM
The Midea is found in Europe, the Lago is found in the U.S.
We opened up both of them (and the AP003) and found the model KJ-350G-S1 stamped across all three. Same model with a license to be rebranded and sold.
Danny shared how it works starting at this point of the video youtu.be/HwrAv4Vah0s?...
We opened up both of them (and the AP003) and found the model KJ-350G-S1 stamped across all three. Same model with a license to be rebranded and sold.
Danny shared how it works starting at this point of the video youtu.be/HwrAv4Vah0s?...
Reposted by Clean Air Stars
When it comes to the airborne transmission of viruses, how fast the air is physically removed from the room is important.
In my latest explainer video, I discuss how you can measure how well your home is ventilated, and what you can do improve it.
youtu.be/dMTOLgIc8-I
#ventilation
In my latest explainer video, I discuss how you can measure how well your home is ventilated, and what you can do improve it.
youtu.be/dMTOLgIc8-I
#ventilation
Science @home: Measuring Ventilation
YouTube video by Al Haddrell
youtu.be
November 28, 2024 at 4:55 PM
When it comes to the airborne transmission of viruses, how fast the air is physically removed from the room is important.
In my latest explainer video, I discuss how you can measure how well your home is ventilated, and what you can do improve it.
youtu.be/dMTOLgIc8-I
#ventilation
In my latest explainer video, I discuss how you can measure how well your home is ventilated, and what you can do improve it.
youtu.be/dMTOLgIc8-I
#ventilation
Reposted by Clean Air Stars
4/ To learn more, watch this excellent presentation "Equivalent Clean Airflow and Air Cleaners - key to sustainable IAQ" from Nov 18 2024: event.webcasts.com/starthere.js...
Bahnfleth describes the history at 39 minutes.
Bahnfleth describes the history at 39 minutes.
Equivalent Clean Airflow and Air Cleaners – Key to Sustainable IAQ - 1694657
event.webcasts.com
November 21, 2024 at 6:29 PM
4/ To learn more, watch this excellent presentation "Equivalent Clean Airflow and Air Cleaners - key to sustainable IAQ" from Nov 18 2024: event.webcasts.com/starthere.js...
Bahnfleth describes the history at 39 minutes.
Bahnfleth describes the history at 39 minutes.