Healthy Lung Habits · Lungs
The finest particles reach the alveoli — and don't leave.
The mucus escalator catches most of what you inhale. But the finest particles in polluted air — a fraction of the width of a hair — sail straight past it and settle in the alveoli, where there is no escalator at all.
There's more: the finest particles reach the alveoli — and don't leave. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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