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The respiratory tract filters air throughout its length. From the entry to the nose (nose hairs), through the sinuses, the bronchi and bronchioles, down to the entry to the alveoli, different sized particles are filtered out all along the way. The larger particles are removed in the nose the sinuses. The smaller ones are filtered in the bronchioles, where they get stuck to the moist walls. The smallest particles, generally less than 10 microns in aerodynamic diameter, get past all the filtering mechanisms and reach the alveoli.

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