Not sure I agree/understand, but it seems like if I’m inhaling 2x the poison over the same amount of time, that has exactly 2x the impact/risk on your health.
This isn’t the same as something like a virus, where it’s more binary.
To be clear, I’m not arguing to prove I’m right (because I’m certainly not an expert and am open to being wrong), I’m trying to understand more about how particle inhalation can have varying risks (or not) based on density.
