Question

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

Answer 1

because the hairs that enter inside our nasal canal makes sensation to hairs inside, which then sends an impulse to brain and brain return an impulse to extol out the dust particles which is done through sneezing..
hope it helps

Answer 2

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$\huge{ANSWER}$

we sneeze when harmful dust materials Antara Nasal passage and cause irritation.

when we sneeze it exists the bacterias and unwanted dust particles from my nasal passage

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