Results of a cluster RCT on HEPA filters in care homes tldr; finds no effect on winter respiratory infections respiratory infection rate per bedroom resident ❌ Staff absenteeism ❌ the additional CADR is pretty meagre a 🧵 1/n

New preprint on randomized crossover trial of HEPA air cleaners on school classroom attendance tldr; no statistical significant impact on absenteeism or symptom scoring deeper dive, read on... 1/n

barely visit here these days, too much to keep track across platforms, might post some interesting studies...

New study looking at influenza transmission 1 infected person shared small low humidity and poorly ventilated room with 8 uninfected subjects (plus 2 observers). Chatting, playing uno, bit of exercise 5000+ppm CO2 no one got infected 🧵 1/n

New study looking at influenza transmission 1 infected person shared small low humidity and poorly ventilated room with 8 uninfected subjects (plus 2 observers). Chatting, playing uno, bit of exercise 5000+ppm CO2 no one got infected 🧵 1/n

New thesis on HEPA air cleaners in school classrooms: 🧵 TL;DR: In this school study, HEPA air cleaners showed little reliable impact on absenteeism, and air-quality improvements were limited during actual classroom use.

New study protocol for a pragmatic, cluster-randomised, parallel, two-arm, group sequential superiority trial of HEPA filters in school classrooms to commence later this year in Norway pmc.ncbi.nlm.nih.gov/articles/PMC... -Using school absence as outcome -be interesting to see the results

Classroom air purifiers for reducing school absence: study protocol for a pragmatic, cluster-randomised, parallel, two-arm, group sequential superiority trial

Respiratory infections like influenza and SARS-CoV-2 pose significant global health risks due to their high transmissibility and severity. SARS-CoV-2 has caused over 7 million deaths worldwide, and the Lancet Commission estimates a >20% chance of a ...

pmc.ncbi.nlm.nih.gov

The stuff you find when you actually read the RCTs in a systematic review... This paper is one of the foundational studies on vitamin D to prevent respiratory infections in kids. Cited 1,400 times as per Google Scholar.

New study on HEPA air cleaners in Finnish school study. Kids fill in daily diary of respiratory symptoms and the prevalence of symptoms reduced when the air cleaner was on. However the prevalence also decreased when the air cleaner was on but HEPA removed 🧵

During the COVID-19 pandemic in 2021, researchers monitored air quality in marquees and semi-outdoor venues at UK mass gatherings to understand ventilation and airborne infection risk — work that directly informed how such events could safely reopen. 🧵

A lot of the analysis on this misses the mark: • “They weren’t on” — maybe, but filtration data says otherwise • “Too small / not ASHRAE 241” — data disagrees. And none of it actually says anything about transmission of respiratory illnesses. 🧵1/n

CIDRAP@cidrap.bsky.social · 10mo ago

HEPA purifiers not tied to less #viral exposure in elementary classrooms, analysis finds #HEPA purifiers were associated with a 33% decrease in viral diversity, but the reduction wasn't linked to fewer school absences. www.cidrap.umn.edu/i...

A lot of the analysis on this misses the mark: • “They weren’t on” — maybe, but filtration data says otherwise • “Too small / not ASHRAE 241” — data disagrees. And none of it actually says anything about transmission of respiratory illnesses. 🧵1/n

CIDRAP@cidrap.bsky.social · 10mo ago

HEPA purifiers not tied to less #viral exposure in elementary classrooms, analysis finds #HEPA purifiers were associated with a 33% decrease in viral diversity, but the reduction wasn't linked to fewer school absences. www.cidrap.umn.edu/i...

With UK heatwaves intensifying, are passive cooling strategies enough? At CIBSE’s seminar, experts explored natural ventilation limits, AirCon efficiency, façade carbon trade-offs & why overheating in schools is a learning crisis. cibsejournal.com/technical/pu...

Pushing the cooling limit: CIBSE Natural Ventilation Group - CIBSE Journal

The limits of passive cooling, healthy learning environments and mitigating overheating were the core subjects of a topical summer event hosted by the CIBSE Natural Ventilation Group in July. Chair Ch...

cibsejournal.com

With UK heatwaves intensifying, are passive cooling strategies enough? At CIBSE’s seminar, experts explored natural ventilation limits, AirCon efficiency, façade carbon trade-offs & why overheating in schools is a learning crisis. cibsejournal.com/technical/pu...

Pushing the cooling limit: CIBSE Natural Ventilation Group - CIBSE Journal

The limits of passive cooling, healthy learning environments and mitigating overheating were the core subjects of a topical summer event hosted by the CIBSE Natural Ventilation Group in July. Chair Ch...

cibsejournal.com

ASHRAE Standard 241 sets guidelines for how much “clean air” (via ventilation, filtration, etc.) is needed in buildings to reduce the airborne spread of infectious diseases like COVID-19. But how were these numbers chosen? 1/n

New oped from @benjonesieq.bsky.social & me 💨 The push for better school ventilation is well-meaning, but claims that it boosts cognition or learning lack strong, causal evidence. Many studies are low quality, poorly controlled, and often overstate effects. #IAQ #ventilation #education 1/5

The June issue of the #REHVA #Journal is out now! 📯 "#Education #Buildings: a Net Zero Transition Conducive to #Health and #Cognitive Performance". 📱 Read it online: www.rehva.eu/rehva-journa... 📨 Want to receive the #REHVA Journal in your inbox? Subscribe here: www.rehva.eu/newsletter-s...

New oped from @benjonesieq.bsky.social & me 💨 The push for better school ventilation is well-meaning, but claims that it boosts cognition or learning lack strong, causal evidence. Many studies are low quality, poorly controlled, and often overstate effects. #IAQ #ventilation #education 1/5

Just read one of the most ridiculous claims in a scientific journal discussion I've ever seen 👀 a therapeutic approach to gut microbiome to improve lung health impacts from air pollution 🤯 in rural Uganda! read on if you want to see how..1/n

New paper describes an in vitro method to infect cell culture with different flu strains by direct inoculation and by aerolised viral solution. Whilst it is an interesting novel methodology, I think it is limited in what it can tell us about the nature of aerosol transmission 1/n

The pandemic was a time when you would have thought people might want to improve their ventilation. But, behaviour change is hard because there are many barriers to change.

Chris Iddon@chrisiddon.bsky.social · last yr.

Great new study by on behavioural aspects of ventilation in hospitality venues. Many monitored venues had poor ventilation, but hosts list many barriers to improve - tho some venues attempt to improve following info campaign. let's see why it's not always simple to ⬆️ ventilation:

Great new study by on behavioural aspects of ventilation in hospitality venues. Many monitored venues had poor ventilation, but hosts list many barriers to improve - tho some venues attempt to improve following info campaign. let's see why it's not always simple to ⬆️ ventilation:

Great new study by on behavioural aspects of ventilation in hospitality venues. Many monitored venues had poor ventilation, but hosts list many barriers to improve - tho some venues attempt to improve following info campaign. let's see why it's not always simple to ⬆️ ventilation:

or a new study shows that either, or a combination of: ▪️reduced viral emission (bcos air cleaner added several days later from initial readings) ▪️changes to window ventilation ▪️presence of an air cleaner see below for fag packet calc to show it can't all be due to air cleaner...

Danielle Beckman@daniellebeckman.bsky.social · last yr.

A new study shows that air cleaners can reduce up to 98,1 % of viral load in the air of a #COVID patient's room with confirmed positive airborne viral RNA. Rooms with HEPA ventilation had zero virus detected. 👏 #CleantheAir in hospitals and schools!👏 www.sciencedirect.com/science/arti...

or a new study shows that either, or a combination of: ▪️reduced viral emission (bcos air cleaner added several days later from initial readings) ▪️changes to window ventilation ▪️presence of an air cleaner see below for fag packet calc to show it can't all be due to air cleaner...

Danielle Beckman@daniellebeckman.bsky.social · last yr.

A new study shows that air cleaners can reduce up to 98,1 % of viral load in the air of a #COVID patient's room with confirmed positive airborne viral RNA. Rooms with HEPA ventilation had zero virus detected. 👏 #CleantheAir in hospitals and schools!👏 www.sciencedirect.com/science/arti...

Off to see Bjork's cornucopia experience today. Trips to see her at the cinema are always an experience. Be that the harrowing Dancer in the Dark or the strangely hypnotic Matthew Barney art film Drawing Restraint 9. I'm sure there will be something to remember

a woman in a green fur coat is standing in front of a blue background

ALT: a woman in a green fur coat is standing in front of a blue background

media.tenor.com

This really interesting paper on SARS-CoV-2 viral emission dynamics in a hamster model has just been published. There’s lots to unpack, but thought I’d start on this expt that investigates characteristics of close range emission 1/n

Had a great time watching Stranger Things: The First Shadow. Fantastic special effects and illusions brought a gripping story to life.

Nice headline, scant on details. it's just a report based on a presentation given by a researcher. Look forward to seeing the methods and data. Researchers report that unknown if reduced exposure to pollution or pathogens or both is causative factor in reported absence reduction

New Scientist@newscientist.com · last yr.

Putting air filters in classrooms seems to reduce student sick days by more than 10 per cent.

Anyone know why the DHHS in the US have pulled the funding for this clinical trials for far UV to reduce indoor transmission of respiratory infections? nationalacademies.org/our-work/cli...