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.

@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...

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.

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/

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...

🧪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/

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.

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...

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...

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.

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

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.

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.

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.

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

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

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

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.

[1/2] 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.

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...

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?...

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

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.

We published a video that looked at a few different versions of this air purifier as they are all based on the Midea KJ350G-S1 youtu.be/HwrAv4Vah0s?... If you search for this name you can find all the other filters that fit. Thanks @cleanairstars.com for originally sharing it was white-labelled.

The report released today by @saferairproject.bsky.social makes a strong case for safer shared air as an accessibility and inclusion issue. www.saferairproject.com/safer-shared...

Starts in 10 mins

Welcome @donmilton.bsky.social to the better place.

Our newest paper on #CorsiRosenthalBox es. pubs.rsc.org/en/content/a... Gr8 prolonged performance at 9 hrs/day & 7 days/week for $70. Degradation of CADR over study, but still well above $250-$600 HEPA units for particles in size range of respiratory aerosols. Never been rocket science, folks.

My 1st post on Blue Sky! Happy to be on this new platform and hoping that those who follow me on the other platform rejoin here. I'll continue to post about indoor air quality, College of Engineering at #UCDavis, and occasionally about dogs & music. 1st image = two #CRBox es & a dean.

📢 Speaker announcement 📢 Join us to hear Prof Jason Monty speak at the launch of our report, 'Safer shared air - a critical accessibility and inclusion issue'. Join us online - register here 👉 https://buff.ly/3UTlSPV #Inclusion #Accessibility #IAQ #SaferSharedAir #SaferAirProject

Soon to be launched, the report, 'Safer shared air - a critical accessibility and inclusion issue'. www.saferairproject.com/advocacy-rep...? h\t @colinkinner.bsky.social #HealthyAir #IAQ #SaferSharedAir #SaferAirProject

90-minute Primer on COVID Safety For Schools. A free resource for teachers and parents to get an overview of the issues and practical tips on what they can do to minimise health risks from COVID. www.covidsafetyforschools.org/primer @covidsafetyed.bsky.social

New paper by Corsi's group at UC Davis on long term clean air delivery rate performance of #CRBox. Held up well after an academic year of operation. pubs.rsc.org/en/content/a...

Time to make the move away from this platform

I'm loving this space. I will continue to share my life as an aerosol scientist, foodie, Italy lover, mom, advocate for clean indoor air for all, airborne infectious disease transmission, and truth teller.

If you are using a CO2 monitor to examine your ventilation remember: A difference between 750 and 850 ppm is not a big deal. Activity level, # people, calibration all impact values. You are looking for a difference between 750 and 3000 ppm. Find the bad rooms! #WorldVentil8Day

Welcome, and good to see so many new but familiar faces. Below is a custom feed of posts related to cleaner indoor air emphasising infection control. Took a bit of work to tailor inclusion and exclusions. Always happy to receive feedback to make it better. bsky.app/profile/did:...

Some hints and tips about ventilating your home to mark #WorldVentil8Day eps.leeds.ac.uk/news/article...

Today is #WorldVentil8Day, to raise awareness of the vital role played by ventilation in supporting our health, well-being, and productivity. Last year we sat down and talked about #airquality 👇👇👇👇👇👇👇👇👇👇👇👇👇👇 eps.leeds.ac.uk/faculty-engi... @cathnoakes.bsky.social @envleeds.bsky.social James Tate

A group of scientists, architects and other experts is calling for government action to mandate indoor air quality standards and improve "terrible" ventilation in Australian schools that can hamper learning. www.abc.net.au/news/2024-11...

Todays the day - #WorldVentil8Day 2024. We need good ventilation for our health and the health and sustainability of our buildings. Ventilation is critical for managing exposure to indoor pollutants, controlling infection spread, keeping damp and mould at bay, and also helps productivity and sleep!

From @BlakeMMurdoch on Twitter: "If you’re fighting for clean air in your school district [& other places...] you can now point to the US EPA’s guidance that ASHRAE should be consulted, specifically Standard 241: Control of Infectious Aerosols..." threadreaderapp.com/thread/18532...

Just one day to go to World Ventilation Day. Please share all of your best ventilation research and practical tips tomorrow to promote the importance of good ventilation for health #WorldVentil8Day #EnablingAction www.worldventil8day.com

Ionization can reduce pathogens in small chambers, but does it work in real life? Not according to our latest paper. We looked at airborne culturable bacteria in a lecture hall when an in-duct ionization system was on vs. off and found no differences. pubs.acs.org/doi/10.1021/... /1

Not every air cleaning claim is true. An important study (by @linseymarr.bsky.social's team) on the real world performance of in-duct ionization systems demonstrates minimal impact on culturable bacteria in a large lecture hall.

EPA infographic on reducing spread of common respiratory viruses indoors. www.epa.gov/indoor-air-q...

The official US agency EPA updates ventilation guidance to prevent the spread of respiratory viruses at home, school, and work. The updated guidance outlines how to implement ventilation strategies as part of a multi-layered approach. www.epa.gov/newsreleases...

U.S. Rep. Paul Tonko has introduced a bill in Congress giving @EPA the authority and resources to regularly study indoor air quality in schools and child care facilities. The bill also supports technical assistance, guidance and best practices. www.congress.gov/bill/118th-c...