Question

why do we often sneeze when we inhale a lot of dust Laden air. ​

Answer 1

Explanation:

To remove the duat particles which get entered in our body during inhalation , we sneeze

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Answer 2

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We often sneeze when we inhale a lot of dust-laden air to expel out these foreign particles. These particles get past the hair in the nasal cavity and irritate the lining of the cavity which  triggers a message to the brain. The brain instructs the nasal chamber to initiate sneezing. This is a method to remove the unwanted dust particles from the nostrils. Sneezing is a type of defense mechanism used by our body.