Explain how the air we breathe in gets cleaned while passing through the nasal passage.

(N/A) $1$. As air enters the nasal passage, it encounters fine hairs called cilia.
$2$. These hairs act as a filter to trap dust particles and other impurities.
$3$. Additionally, the inner lining of the nasal passage secretes mucus, which traps smaller particles and microorganisms.
$4$. This ensures that the air reaching the lungs is clean and free from foreign particles.