Some studies have measured that the droplets of human sneezing can fly out several meters away, even up to 8 meters.
When the nasal cavity appears foreign matter or unclean matter, germs, the human body will trigger sneezing, sneezing belongs to a kind of human body’s defense mechanism, mainly for the entry of the nasal cavity of the foreign matter, through the sneezing of the foreign matter out. For example, allergic rhinitis patients will often sneeze during the pollen season to get rid of pollen through sneezing.
However, sneezing generates a large thrust in a split second and can expel as many as 30,000 to 40,000 individual droplets of 0.5 to 12 um in diameter, which can be ejected at very high speeds, up to 8 meters away. These small droplets may contain disease infectious agents, leading to the spread of disease.
It is recommended that you cover your nose and mouth when sneezing to prevent the spread of droplets.