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My face when I found out what we have been breathing on our daily commutes 😳
Here is what actually happens underground.
Scientists at King's College London ran monitors measuring PM2.5 (fine particle pollution, the tiny stuff small enough to reach deep into your lungs) across the Tube network. Here's what they found:
📊 The Underground has around 15x more of this pollution than the roads above it
📊 The Victoria line is the worst. Median reading 361, with peaks up to 885
📊 The WHO safe limit is 15. So the typical Victoria line reading sits at roughly 24x over it
📊 Nearly half of it is iron oxide, metallic dust thrown off by brakes and wheels grinding in the tunnels
To be clear, this is exposure data, not proof that your commute alone will make you ill. But a daily journey adds up, and most of us never think about it.
So here is the small hack I use. I breathe through my nose 👃🏽
Why it helps:
✅ Your nose is a genuine filter. It traps a lot of the coarser dust before it reaches your lungs
✅ It warms and humidifies the air instead of pulling cold, dirty air straight down
✅ It produces nitric oxide, which helps your body actually absorb the oxygen you take in
But I am not going to oversell it. nose breathing does very little against the finest metallic particles, and those are the ones that penetrate deepest. It is a sensible habit, not a filter mask. Think marginal gains, not complete protection. 🛡️
Would I stop taking the Tube? Nope. But I keep my mouth shut down there, and now you know why 🤐
Have you thought about this? 👇🏽
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