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Why do we often sneeze when we inhale a lot of dust-laden air ?

3. Why do we often sneeze when we inhale a lot of dust-laden air?

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Sneezing removes the foreign particle like dust particles, smoke from the air inhaled which ensures good air quality inside our body.

When we inhale, unwanted particles get trapped in the hair present in our nasal cavity. However, sometimes these particles may get past the hair causing irritation in the lining of the cavity. This causes sneezing. 

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