A sneeze (or sternutation) is a semi-autonomous, convulsive expulsion of air from the lungs, most commonly caused by foreign particles irritating the nasal mucosa. Sneezing can further be triggered through sudden exposure to bright light, a particularly full stomach, or as a result of unexpected, climatic variations in one's environment such as rapid changes in temperature and humidity levels.
Therefore, a sneeze may trigger the outflow of trapped mucous material in the nasal cavity as well as substances from the respiratory or pharyngeal areas. This may be responsible for the bad smell.
Hope this answered your query. You may visit an Ear Nose and Throat specialist to get this examined further.
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