iiinova — where your digital self keeps evolving

Reposted by Clean Air Stars

Mayor of London, Sadiq Khan @london.gov.uk · 17/10/2025

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.

1528562

Reposted by Clean Air Stars

Mayor of London Press Office @ldn-pressoffice.bsky.social · 17/10/2025

@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...

06819

Reposted by Clean Air Stars

Mayor of London, Sadiq Khan @london.gov.uk · 17/10/2025

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.

621244

Reposted by Clean Air Stars

Prof Cath Noakes @cathnoakes.bsky.social · 07/04/2025

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/

36215

Clean Air Stars @cleanairstars.com · 20/04/2025

There are many white labelled brands of these devices and so a variety of sources of replacement filters tend to appear. This is an outdated list of sources simp.ly/publish/0P5fBm

simp.ly

Midea/Taotronics TT-AP003 Replacement Filters

100

Reposted by Clean Air Stars

Linsey Marr @linseymarr.bsky.social · 20/02/2025

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...

drive.google.com

MarrPostdocAd20250219.pdf

58738

Reposted by Clean Air Stars

Prof Cath Noakes @cathnoakes.bsky.social · 18/02/2025

🧪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/

sciencedirect.com

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…

25921

Reposted by Clean Air Stars

LET'S AIR @nousaerons.bsky.social · 19/02/2025

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.

1122

Reposted by Clean Air Stars

Simon A. Joosten @simonjoosten.bsky.social · 23/01/2025

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...

doi.org

0138

Clean Air Stars @cleanairstars.com · 17/02/2025

It’s has a GB/T tested CADR at turbo speed of 600m3/hr at a reported 51.5dBA. The issue is that there is no mention on CADR and noise levels at the other 4 speeds which is what’s needed for it to be useful in the tool (unless noise isn’t an issue at 50dBA)

100

Clean Air Stars @cleanairstars.com · 17/02/2025

If you find any send it through and it will be added to the tool

100

Reposted by Clean Air Stars

Clean Air Where @cleanairwhere.bsky.social · 07/02/2025

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...

1128

Reposted by Clean Air Stars

Prof Cath Noakes @cathnoakes.bsky.social · 11/02/2025

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.

01612

Reposted by Clean Air Stars

The Safer Air Project @saferairproject.bsky.social · 13/02/2025

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

youtu.be

Invisible inclusion

YouTube video by The Safer Air Project

32515

Reposted by Clean Air Stars

Al Haddrell @ukhadds.bsky.social · 02/02/2025

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.

26812

Reposted by Clean Air Stars

Trish Greenhalgh @trishgreenhalgh.bsky.social · 13/11/2024

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.

66547711272

Reposted by Clean Air Stars

Trish Greenhalgh @trishgreenhalgh.bsky.social · 17/01/2025

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.

20998308

Clean Air Stars @cleanairstars.com · 17/01/2025

Pricing and availability of devices is a year or two out of date. There are some newer DIY options missing too. Anyone can message this account with new devices and specs to be added

060

Reposted by Clean Air Stars

Sue J @smpwrgr.bsky.social · 12/01/2025

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

1306

Reposted by Clean Air Stars

HouseFresh.com @housefresh.bsky.social · 14/01/2025

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

energystar.gov

Product Finder — ENERGY STAR Certified Room Air Cleaners

Compare ENERGY STAR Certified Room Air Cleaners, find rebates, and learn more.

1145

Reposted by Clean Air Stars

Al Haddrell @ukhadds.bsky.social · 12/01/2025

The total views on the channel is approaching 10k, which is pretty wild for a channel dedicated to explaining how aerosol affects human health.

1142

Clean Air Stars @cleanairstars.com · 09/12/2024

You could also argue that a larger space/higher ceilings is somewhat protective as aerosols have more room to dilute into, but as mentioned they won’t necessarily dissipate as quickly as CO2.

030

Clean Air Stars @cleanairstars.com · 09/12/2024

But importantly, it takes longer for CO2 to reach its steady state in a large space. Someone could be in a poorly ventilated space for a while before CO2 reveals poor ventilation.

140

Clean Air Stars @cleanairstars.com · 08/12/2024

In a large space where someone is in close proximity to an emitter and there’s little active or passive mixing. CO2 will generally diffuse more evenly throughout a space than aerosols.

120

Clean Air Stars @cleanairstars.com · 07/12/2024

Ultimately the question is how actionable the output is. What’s the sensitivity and specificity of the number in detecting high risk of infection scenarios. There will be scenarios where CO2 is low and risk of infection is high, and those where CO2 is high but risk of infection is low.

281

Reposted by Clean Air Stars

Aaron Collins @masknerd.bsky.social · 05/12/2024

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.

1314

Reposted by Clean Air Stars

Aaron Collins @masknerd.bsky.social · 01/12/2024

[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.

1621053

Clean Air Stars @cleanairstars.com · 05/12/2024

And source control hoods such as this one tested by @simonjoosten.bsky.social pubmed.ncbi.nlm.nih.gov/35156259/

110

Reposted by Clean Air Stars

David Elfstrom 🍁 @davidelfstrom.bsky.social · 05/12/2024

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.

415164

Clean Air Stars @cleanairstars.com · 05/12/2024

That’s close to the single pass efficiency of the 3M Filtrete 1900s in those configurations with a total high filter surface area that result in low face velocities.

040

Reposted by Clean Air Stars

Don Milton @donmilton.bsky.social · 05/12/2024

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...

tandfonline.com

Optimizing the Design of Room Air Filters for the Removal of Submicrometer Particles

Room air filters, which usually closely resemble high-efficiency particulate air (HEPA) filters, should be designed to maximize the clean air delivery rate (CADR) rather than operate at the very hi...

95313

Clean Air Stars @cleanairstars.com · 04/12/2024

You can also get a 15% CADR boost using the 3rd Party Pureburg filter and simply removing the layer of carbon bsky.app/profile/clea...

0100

Reposted by Clean Air Stars

HouseFresh.com @housefresh.bsky.social · 04/12/2024

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?...

youtu.be

Our BEST CHEAP Air Purifier is DISCONTINUED, NOW WHAT?!?! - TaoTronics AP003 - Lago - Midea Review

YouTube video by HouseFresh

295

Clean Air Stars @cleanairstars.com · 04/12/2024

Great insights. Should be noted that if you remove the carbon layer from the Pureburg (easy to do) you actually get a CADR boost above the original OEM filter with the HEPA component being the same thickness. bsky.app/profile/clea...

061

Clean Air Stars @cleanairstars.com · 03/12/2024

The folks at @housefresh.bsky.social tested the UK Midea version and apparently found it to be quieter at each fan speed relative to the Taotronics device, so it’s possible they may have slight manufacturing differences.

190

Clean Air Stars @cleanairstars.com · 03/12/2024

They are likely the same generic device white labeled under many different brands, but not aware of any specific testing of the Lorell 420 device.

160

Reposted by Clean Air Stars

Al Haddrell @ukhadds.bsky.social · 28/11/2024

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

youtu.be

Science @home: Measuring Ventilation

YouTube video by Al Haddrell

1814057

Clean Air Stars @cleanairstars.com · 28/11/2024

But assessing actual individual risk isn’t possible. CO2 can still be valuable though in helping determine where there is likely “addressable” elevated risk.

010

Clean Air Stars @cleanairstars.com · 28/11/2024

Yes. A high CO2 can tell you there’s room for improvement with ventilation (engineering perspective i.e. modifiable environment factors) or reducing occupancy (public health perspective i.e. numbers of potential emitters and susceptibles that could continue chains of transmission).

110

Clean Air Stars @cleanairstars.com · 28/11/2024

This specifies the conditions under which that risk was calculated (even then it would be challenging to read this chart reliably due to the additional variables of emission rate which can vary by orders of magnitude due to variables such as emitter’s viral load, vocalisation etc)

120

Clean Air Stars @cleanairstars.com · 28/11/2024

There would be at least a couple of considerations. 1. Relative risk from poor ventilation (Need to estimate ventilation which is not straightforward) 2. Relative risk from modified viability (still too early to verify significance) Goal is deriving some semblance of actionable data.

010

Clean Air Stars @cleanairstars.com · 27/11/2024

Unfortunately you won’t be able to calculate risk of transmission as its function is dependent on variables you have no ability to assess (emission rate, distance to emitter, airflow direction, etc). Best you can do is calculate relative risk against another scenario with adjusted variables.

191

Reposted by Clean Air Stars

David Elfstrom 🍁 @davidelfstrom.bsky.social · 21/11/2024

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.

event.webcasts.com

Equivalent Clean Airflow and Air Cleaners – Key to Sustainable IAQ - 1694657

1142

Clean Air Stars @cleanairstars.com · 21/11/2024

They are great. Even at lowest fan speed noise can be problematic however in quiet classrooms. Sub 40dBA is really the minimum and with an acceptable noise characteristic.

110

Clean Air Stars @cleanairstars.com · 21/11/2024

You would need to be running them on the lowest speed at 153CFM each unless it was a very noisy classroom and you could run them at a higher speed.

150

Clean Air Stars @cleanairstars.com · 21/11/2024

While the wall mounting is useful, the CADR achieved for a given noise level is fairly low meaning you would need a large number in a classroom to deliver meaningful risk reduction.

140