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There are mucus and hairs present in our nose .so when the dust particles come along with the
air the air is filtered out and the dust partices get block in the hair lining and irritate them ,.thus we sneeze for giving the dust particle out.
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It is so because the foreign particles irritate the tiny little hairs in the nose as they are extremely sensitive to foreign agents, thus making you sneeze to clear it out and for us to breathe properly.