/7
We wouldn’t share drinks with strangers - so why are we okay sharing air?

#CleanAir #IndoorAirQuality #Ventilation #CO2

6/7
That’s where ventilation comes in.

Good ventilation clears that shared air and replaces it with fresh air - lowering CO₂ and reducing risk.

Simple, right?

5/7
And most of the time we have no idea it’s happening.

You can’t see it. You can’t smell it. But it’s affecting how we think, feel and function.

4/7
That includes viruses, bacteria, and everything else in the air.

It’s also linked to:

* poorer concentration
* headaches
* feeling tired or sluggish

3/7
Why does that matter?

Because CO₂ is a really useful signal.

Higher CO₂ = more shared air
More shared air = higher chance you’re breathing in what other people have exhaled

2/7
It’s a bit odd to think you might be sitting in a room with no fresh oxygen coming in, right?
When it feels stuffy - that’s exactly what’s happening.

🧵 1/7
CO₂ is something we all produce every time we breathe out.

Outdoors, it’s not a problem.
Indoors, it builds up fast - especially in busy or poorly ventilated spaces.

😷 CO₂ levels at a GP’s office hit 1,400ppm - in the room meant to keep you healthy. An empty waiting room was already at 1,000ppm. Is your doctor’s surgery making you sicker?
#IndoorAirQuality #CO2Levels #PublicHealth

2026 Clean Air School Symposium Join us at the 2026 Clean Air School Symposium, an American Lung Association's event to support and promote lung health.

Indoor air quality is finally getting attention. It’s good to see more webinars on this topic.

The American Lung Association has published practical steps to improve the air we breathe indoors.

Link below to sign up.

2026 Clean Air School Symposium action.lung.org/site/TR?fr_i...

Long Covid Predicted to Cost OECD Economies $135 Billion a Year The pandemic might be over, but new research indicates long Covid is likely to reverberate across OECD economies, costing up to $135 billion a year over the next decade.

$135bn a year.

Estimated cost of long Covid across developed economies (OECD data).

Not just healthcare - workforce impact.

Airborne infections matter.

Indoor air is one of the few things we can change.

www.bloomberg.com/news/article...

Crinkly tulip appreciation post

Busy venue, peak time, high occupancy

CO₂ stayed around 600 ppm throughout

That’s a strong signal of good ventilation and low rebreathed air - something that impacts comfort, cognition, and exposure risk

You wouldn’t share your drink. Why share someone else’s air?

#IndoorAirQuality #Ventilation

Do you track the thing you do 20,000+ times a day?

We track food, steps, sleep, hydration.

But not the air we breathe.

Poor air affects:
• concentration
• mood
• infections
• long-term health

You can’t see it - but it matters.

#WorldHealthDay #StandWithScience

13/
#IndoorAirQuality #CleanAir #HealthyChildren
@safeairschoolsuk.bsky.social @cleanair4kids.bsky.social

12/
Small changes, big impact.

Because maybe kids aren’t “always sick”.

Maybe we’ve just been underestimating the air they’re breathing.

11/
Cleaner air doesn’t have to be complicated:

• opening doors or windows
• using air filters
• keeping an eye on CO₂ levels
• giving rooms a quick air refresh between groups

10/
If it matters in hospitals, it matters just as much in nurseries, soft play, cafés and classrooms.

9/
But the science is catching up with us.

The Covid Inquiry this week reinforced something many have been saying for years.

Airborne transmission matters.

8/
This isn’t about blame.

These spaces are designed for fun, warmth and safety, and ventilation is often just overlooked.

7/
For context, good indoor air should sit roughly between 400–800ppm.

Anything higher starts to indicate poor ventilation and a build-up of exhaled air.

Ive had better readings on the London Underground.

6/
We’d never encourage kids to share water bottles because it’s unhygienic.

Yet sharing air like this is something we’ve normalised.

5/
What does that actually mean?

It means the air the children were breathing had already been in someone else’s lungs.

4/
The second spike was in the lunch room.

No openable windows. No visible ventilation. Levels climbed again as soon as we all sat down.

3/
The first spike was in the main play area.

Levels dropped quickly once the front door was opened and fresh air rolled in.

2/
We often say “kids are always sick”, but is it really that surprising?

Children’s spaces are often crowded and poorly ventilated.

🧵 1/
Over the weekend I spent the morning at a kids’ role play café / soft play party and took my monitor along.

CO₂ levels were higher than the London Underground at rush hour. In a children’s play space.

bsky.app/profile/samm...

#Meningitis #cleanair

The UK Covid Inquiry has acknowledged airborne transmission was not properly considered early on.

We focused on surfaces. We overlooked the air.

If infections spread through the air, indoor air quality is fundamental to health.

This must now be reflected in PPE guidance for the NHS.

3/3
Kids spend so much time in crowded, poorly ventilated spaces

Then we wonder why coughs and colds rip through everyone the following week and hang around for days, keeping kids off school and parents off work.

Improving the air was low effort

Ventilation matters

#IndoorAirQuality #Ventilation

2/3
We planned the entertainment, food, music and the environment.

I asked parents about allergies to keep kids safe.
Why not think about other environmental factors too?

Ventilation and filtration were running the whole time.
Honestly even grandma would have been fine at this party.