On: I bought a CO2 monitor and it broke me

[bawolff]

I'm pretty sure PM2.5 dust and co2, isn't the type of "dirt" the hygine hypothesis is about.

https://en.m.wikipedia.org/wiki/Hygiene_hypothesis seems to suggest it is about specific microorganisms.

[thaumasiotes → bawolff]

No, but if you're filtering tiny particles, you're also filtering big particles.

[wkat4242 → thaumasiotes]

Not really in my experience. My air purifier and separate air quality sensor both show near zero levels of PM2.5 in my house after running the purifier for hours but I can still see a lot of dust floating around with a flashlight.

[filcuk → thaumasiotes]

It is counterintuitive, but HEPA filter efficiency increases with smaller particles. https://bofainternational.com/en/our-technology/filter-techn...