Question

why do we often sneeze when we inhale a lot of dust - laden Air ?
very short answer ​

Answer 1

Answer:

They irritate the mucus lining of the nasal cavity, and as a result we sneeze.

Answer 2

Answer:

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.