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Reposted by Clean Air Where

Hazel Newlevant @newlevant.bsky.social · 24/09/2026

New study suggests that raising school ventilation levels to ASHRAE 241 targets could reduce flu cases by 33% for the WHOLE POPULATION! We need clean air in schools so bad!!! www.medrxiv.org/content/10.6...

Climate-Ready Buildings: Insights from U.S. Schools in a Global Context

Climate Week NYC • Sept 23
Projected Health Impacts of Cleaner Air in NYC Schools
Geetha Jeyapragasan and Charlie Whittaker I University of California, Berkeley
We modelled the projected impact of higher levels of ventilation and filtration in NYC schools. We did this by assessing the impact of achieving a field-recognized standard for healthy indoor air (ASHRAE Standard 241), developed by the American Society for Heating, Refrigeration and Air Conditioning, the professional association of ventilation engineers. Adopting it in schools would reduce the burden of seasonal respiratory illness and improve preparedness for future epidemics.
We developed an epidemiological modelling framework to estimate how improving building air quality affects airborne disease transmission in schools. Here, using seasonal influenza as a case study, we share results about the potential public health impact of raising ventilation such that all schools met ASHRAE 241 targets, approximately 9 equivalent air changes per hour (ACH).
INFLUENZA INFECTIONS AVERTED
PER YEAR
54%
IN CHILDREN
33%
IN OVERALL POPULATION
Share of influenza infections averted in children and the general population if all schools achieved ASHRAE 241 filtration targets. This also results in 30% reduction in hospitalizations across all ages.
IMPACTS
261K
SCHOOL ABSENTEE DAYS
ELIMINATED PER YEAR
$25M
IN PARENTAL
PRODUCTIVITY LOSSES
SAVED
Days of school absenteeism prevented each year through reduced influenza transmission, and the value of the parental working time no longer lost to caring for sick children.

Why This Matters for New York City
ALL FLU CASES
New York City operates the largest public school system in the United States, with approximately 880,000 students across 1,800 schools. A large portion of this infrastructure predates modern ventilation standards, with the average school building around 70 years old. An inspection of NYC schools i…

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Clean Air Where @cleanairwhere.bsky.social · 06/10/2026

7/7 It’s miserable and disruptive. If cleaner shared air can help reduce some of that, it’s worth taking seriously. Prevention first and then everything else on top. #IndoorAirQuality #InfectionPrevention #Ventilation #CleanAirWhere

Light blue Clean Air Where graphic titled “What helps?” It lists ways to reduce infection risk: handwashing, fresh air and ventilation, filtration, staying home when ill, and respirators or masks in higher-risk settings. Decorative illustrations show handwashing, an open window, an air purifier, a house and a respirator. A highlighted line at the bottom reads: “Shared air matters too.”

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Clean Air Where @cleanairwhere.bsky.social · 06/10/2026

6/7 Ventilation, filtration and respiratory protection all have a part to play alongside the things we already do to stay healthy. We make jokes about this time of year, but no one wants to be smashing off the Calpol, cancelling everything and watching the whole family go down one after another.

Light blue Clean Air Where graphic titled “Fungi.” Text explains that it isn’t only viruses and that some fungal spores can also be inhaled from the air. Examples listed are aspergillosis, blastomycosis, coccidioidomycosis and histoplasmosis. Stylised fungal spores and mould-like structures are shown on the right.

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Clean Air Where @cleanairwhere.bsky.social · 06/10/2026

5/7 We’re very used to thinking about hand hygiene, but infection prevention isn’t only about what we touch. What we breathe matters too. We wouldn’t share our drinks with everyone around us, yet in poorly ventilated spaces we can end up repeatedly breathing air others have already breathed out.

Light blue Clean Air Where graphic titled “Bacteria.” It lists examples of bacterial diseases that can be transmitted through the air we breathe: Bordetella pertussis and whooping cough; Corynebacterium diphtheriae and diphtheria; Legionella pneumophila and Legionella; Streptococcus pneumoniae and meningitis; and Mycobacterium tuberculosis and tuberculosis. A note at the bottom says these are examples from a larger list of airborne diseases.

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Clean Air Where @cleanairwhere.bsky.social · 06/10/2026

4/7 Children’s spaces are a big one. Classrooms, nurseries and soft play can be crowded and poorly ventilated. Lots of people. Lots of breathing. Lots of time indoors. Public transport is another obvious example.

Light blue Clean Air Where graphic titled “Viruses 2.” It lists examples of viruses and associated illnesses that can spread through shared air: morbillivirus and measles; mumps virus and mumps; rhinovirus and the common cold; rubivirus rubellae and rubella; respiratory syncytial virus, RSV, and bronchiolitis; and variola virus and smallpox. Text at the bottom reads: “Many respiratory infections spread through shared air.”

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Clean Air Where @cleanairwhere.bsky.social · 06/10/2026

3/7 If we can reduce how much infectious material people are exposed to in the first place, that has to be a good thing. And that really matters in places where lots of people are sharing the same air.

Light blue Clean Air Where graphic titled “Viruses 1.” It lists examples of viruses and associated illnesses that can be transmitted through the air we breathe: adenovirus; bocavirus; varicella zoster virus, which can cause chickenpox; coronaviruses including MERS, SARS and SARS-CoV-2, associated here with COVID-19; influenza type A viruses including H1N1 and H5N1; and influenza type B virus. Stylised virus icons and airflow graphics appear around the list.

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Clean Air Where @cleanairwhere.bsky.social · 06/10/2026

2/7 Handwashing is great. Looking after ourselves matters too. Keeping fit, eating well, getting enough sleep and taking vitamins if they’re right for you all have a place. But prevention should always be the first layer.

Light blue graphic titled “Why handwashing isn’t the whole story.” Four illustrated steps show a person breathing, particles being released into the air, particles building up in a poorly ventilated room, and another person breathing them in. Text at the bottom reads: “Infection prevention is about what we touch and what we breathe.” The words “Clean Air Where” appear at the bottom.

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Clean Air Where @cleanairwhere.bsky.social · 06/10/2026

🧵 1/7 Last week we posted about the common misconception that cold air makes you sick. As the weather cools, we all head indoors more, just as virus season gets going. That means more shared air, more infections and more disruption.

Light blue Clean Air Where graphic reading: “Handwashing is great. But it’s not the whole story. How many illnesses are linked to pathogens we can inhale from shared air?” Illustrated hands being washed appear at the top right, with stylised airborne particles and virus icons moving through shared air below. Clean Air Where written at the bottom.

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Clean Air Where @cleanairwhere.bsky.social · 02/10/2026

Absolutely - cold, dry air may affect some of our respiratory defences and potentially make us more susceptible. But cold air itself can’t give you a viral infection - you still need to be exposed to the virus.

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Clean Air Where @cleanairwhere.bsky.social · 01/10/2026

4/4 You may have seen people talking about “burping” the house. A few minutes with windows wide open can refresh indoor air and help with condensation. Purifiers reduce particles, not CO₂. For that, you need ventilation. Cold weather isn’t the problem. Infected shared air is. #IndoorAirQuality

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Clean Air Where @cleanairwhere.bsky.social · 01/10/2026

3/4 Handwashing still matters, but many respiratory infections also spread through the air when we breathe, talk, cough or sneeze. In poorly ventilated spaces, infectious particles can build up in the shared air around us. We can then breathe them in and become infected.

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Clean Air Where @cleanairwhere.bsky.social · 01/10/2026

2/4 Temperature and humidity can affect virus survival and our respiratory defences, but cold air itself doesn’t create a viral infection. So no, the flu is not waiting for you in the park.

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Clean Air Where @cleanairwhere.bsky.social · 01/10/2026

🧵 1/4 Cold weather doesn’t give you a “chill” that makes you sick. What actually happens is that colder weather pushes us indoors, where we spend more time sharing air in spaces that are often poorly ventilated.

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Clean Air Where @cleanairwhere.bsky.social · 25/09/2026

4/4 Sometimes we generate it ourselves. Source control matters, and understanding what we’re adding to indoor air is a pretty good place to start. Study: www.sciencedirect.com/science/arti... #IndoorAirQuality #PM25

sciencedirect.com

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Clean Air Where @cleanairwhere.bsky.social · 25/09/2026

3/4 This doesn’t show that lighting a candle will make you ill, and different types of PM₂.₅ aren’t necessarily equally harmful. But it’s a good reminder that indoor pollution isn’t only coming in from outside.

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Clean Air Where @cleanairwhere.bsky.social · 25/09/2026

2/4 Hourly peaks reached: Incense: 1,293 µg/m³ Oil diffusers: 858 µg/m³ Candles: 622 µg/m³ Exposure was highest in smaller homes and where ventilation was poorer.

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Clean Air Where @cleanairwhere.bsky.social · 25/09/2026

🧵 1/4 New research involving Imperial College London and UKHSA measured indoor air in 112 London homes and found routine fragrance-product use could substantially increase indoor PM₂.₅.

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Reposted by Clean Air Where

Clinically Vulnerable Families 💙💜💗 @cvcev.bsky.social · 24/09/2026

Why should we clean the air in schools? - Reduces pollutants which cause asthma, multiple cancers, and dementia. - More resilient to airborne disease and pandemics We need health-based standards for air quality in schools. Fund ventilation filtration and maintenance. #HIAS2026

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Reposted by Clean Air Where

Clinically Vulnerable Families 💙💜💗 @cvcev.bsky.social · 24/09/2026

💨Healthy Indoor Air in Schools France : 3 Priorities 1. We must make indoor air quality a fully integrated component of public health and prevention policies, particularly in schools and facilities serving the most vulnerable populations.

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Reposted by Clean Air Where

Dr. Lucky Tran @luckytran.com · 24/09/2026

Happy to report the UN has fantastic indoor air quality! But I did get questioned by multiple security guards about why I was wearing a mask. I told them we were attending meetings about preventing pandemics 🤷🏻‍♂️

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Clean Air Where @cleanairwhere.bsky.social · 24/09/2026

4/4 Training can be for a whole team or a smaller group of relevant staff. Not ready for a full booking? One place is £75, and if you later book the wider setting, I’ll deduct that £75 from the total. 📩 training@cleanairwhere.co.uk

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Clean Air Where @cleanairwhere.bsky.social · 24/09/2026

3/4 Schools and childcare settings already think about allergens, cleaning products, temperature, infection control, hazardous substances and medical needs as part of safeguarding and health & safety. Indoor air quality is another part of that picture.

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Clean Air Where @cleanairwhere.bsky.social · 24/09/2026

2/4 The session covers ventilation, filtration, CO₂, allergens, respiratory health, pollution and other airborne hazards. A big part of it is explaining the why behind the guidance, policies and everyday procedures settings are already asked to follow.

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Clean Air Where @cleanairwhere.bsky.social · 24/09/2026

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Clean Air Where @cleanairwhere.bsky.social · 24/09/2026

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Clean Air Where @cleanairwhere.bsky.social · 24/09/2026

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Clean Air Where @cleanairwhere.bsky.social · 24/09/2026

🧵 1/4 Indoor air quality training for schools, nurseries & childminders. Autumn term introductory prices: Childminders £75 Nurseries £195 Schools £295 In person or remote.

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Clean Air Where @cleanairwhere.bsky.social · 18/09/2026

Enjoyed this conversation with LEYF and Air Aware Labs about what children are breathing - indoors and out. Pollution, ventilation, filtration, monitoring, cleaning products, green space and practical action. Loads in here for Early Years settings and parents: www.leyf.org.uk/news/what-ar...

leyf.org.uk

Air Pollution & Early Years

What does air pollution mean for children? Explore indoor and outdoor air quality, ventilation and practical ways Early Years settings can support cleaner air.

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Clean Air Where @cleanairwhere.bsky.social · 14/09/2026

7/7 Respirators aren’t only useful for infection prevention. They can also help reduce exposure to wildfire smoke, mould spores, fine-particle pollution and occupational dusts. Thankfully, no broken finger 🙌 And it’s nice to know it’s unlikely we’ve come out with anything extra either. 🦠

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Clean Air Where @cleanairwhere.bsky.social · 14/09/2026

6/7 Flu is starting to creep up too, with RSV and other seasonal viruses joining the mix as we head into autumn and winter. Even a “normal” infection can mean missed school, missed work and cancelled plans. Some can also lead to post-viral complications, including Long COVID.

UKHSA graph comparing rolling seven-day influenza test positivity in England across recent flu seasons. The 2026–27 line is beginning to rise from its low summer baseline as September progresses.

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Clean Air Where @cleanairwhere.bsky.social · 14/09/2026

5/7 I also keep an eye on @skeuomorphology’s PCR positivity maps. They’re useful for seeing how much things can vary locally rather than relying on one national number.

UK map shared by @skeuomorphology showing COVID PCR test positivity by local area. The latest figures shown are 4.03% positivity in Scotland and 6.66% adjusted positivity in England, with substantial regional variation.

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Clean Air Where @cleanairwhere.bsky.social · 14/09/2026

4/7 COVID certainly isn’t just a winter virus, but (on X) @BuDs_UK are reporting infection levels rising in England as we move into autumn. Their latest estimate is around 1 in 675 people infected.

Screenshot of a BuDS Disability Service COVID update for England. It says infection levels are continuing to rise, with an estimated 1 in 675 people infected as of 6 September 2026. Their overall COVID risk level remains Moderate and is approaching Moderately High.

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Clean Air Where @cleanairwhere.bsky.social · 14/09/2026

3/7 Kiddo wears a @flomask.bsky.social and I wear a fit-tested 3M Aura FFP3. They’re respirators, rather than the loose blue surgical masks most of us got used to seeing in 2020. If I have the choice, I’m choosing the respirator.

Close-up of an opened white 3M Aura respirator resting on someone’s lap, showing the inside seal, red head straps and folded respirator shape.

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Clean Air Where @cleanairwhere.bsky.social · 14/09/2026

2/7 So off to hospital we went. Because we went in with one problem and really didn’t fancy coming home with another, we wore respirators. I try not to let people breathe on me if I can help it.

A picture of me, female, brown hair, yellow coat with an FFP3 respirator on.

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Clean Air Where @cleanairwhere.bsky.social · 14/09/2026

🧵 1/7 Well, we’re off to a strong start to the school year. Kiddo injured his finger in PE and, after making it through the rest of the day with a very swollen finger, we decided we should probably get it X-rayed.

$X-ray of a child’s injured finger and hand after a PE accident, taken at hospital to check for a possible fracture.$

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Clean Air Where @cleanairwhere.bsky.social · 08/09/2026

3/ Outdoors, we need cleaner transport and lower emissions. Indoors, we need better ventilation, filtration where useful, monitoring and people who understand what the numbers actually mean. We need both. #WorldCleanAirDay #AirQuality #CleanAirWhere

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Clean Air Where @cleanairwhere.bsky.social · 08/09/2026

2/ This year’s message is really simple: cleaner air is good for health, good for economies and good for the climate. That applies outdoors and indoors.

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Clean Air Where @cleanairwhere.bsky.social · 08/09/2026

🧵 1/ Yesterday was the International Day of Clean Air for blue skies. 🌍 I missed it because the day was absolutely rammed 😅 But clean air matters today too, and tomorrow, and every day after that.

Bright blue-sky graphic for the International Day of Clean Air for blue skies. Large text reads “Clean air matters. Outside and inside. Today, tomorrow, and every day after that.” Four coloured icons represent healthier people, stronger economies, a cleaner environment and brighter futures. A green cityscape sits beneath the blue sky, with text explaining that clean air supports health, comfort, concentration and wellbeing and can reduce exposure to harmful pollutants and infectious particles.

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Clean Air Where @cleanairwhere.bsky.social · 08/09/2026

Ah yes, apologies. This is something I’ve only just learned about. Thank you for highlighting and give me a minute to fix it…

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Clean Air Where @cleanairwhere.bsky.social · 08/09/2026

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Clean Air Where @cleanairwhere.bsky.social · 08/09/2026

2/ This year’s message is really simple: cleaner air is good for health, good for economies and good for the climate. That applies outdoors and indoors.

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Clean Air Where @cleanairwhere.bsky.social · 08/09/2026

🧵 1/ Yesterday was the International Day of Clean Air for blue skies. I missed it because the day was absolutely rammed 😅 But clean air matters today too, and tomorrow, and every day after that.

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Clean Air Where @cleanairwhere.bsky.social · 03/09/2026

3/ Staff have also completed their INSET day training, so they understand why indoor air quality matters and how ventilation and filtration work together. Windows open, filters ready, classrooms looking brilliant. A pretty good way to start the school year. #IndoorAirQuality #BackToSchool

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Clean Air Where @cleanairwhere.bsky.social · 03/09/2026

2/ Thanks to their supportive SLT, the local community, Smart Air and the Corsi-Rosenthal Foundation, every classroom now has air filtration in place, cleaned and ready to go. And honestly, there’s nothing more satisfying than a dirty filter being cleaned. 😅

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Clean Air Where @cleanairwhere.bsky.social · 03/09/2026

🧵 1/ Back-to-school prep is more than uniforms and stationery. This year, we’ve helped Lessness Heath with their indoor air quality back-to-school prep. 📚💨

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Susan Joudrey @sujo.bsky.social · 30/08/2026

regardless of a person's view on various pathogens, just the visable difference between a used filter and a new filter should motivate everyone to advocate for better indoor air quality.

two air filters lying on a wodden floor. one has been used and is dark grey. the other one is white because it hasn't yet been used.

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Clean Air Where @cleanairwhere.bsky.social · 01/09/2026

Today, Clean Air Where delivered indoor air quality training at Lessness Heath Primary 💚 Staff learned how to use monitoring, ventilation and filtration to support healthier classrooms, wellbeing and learning. One teacher immediately brought a CO₂ monitor back into use. #TeacherCPD

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