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Wearing a mask and sanitizing your hands is a typical daily routine to prevent the spread of COVID-19. In particular, as it was confirmed that airborne transmission is the main route of infection for the COVID-19 virus, the role of the mask has become more important. This is because it is effective in blocking aerosols in the respiratory tract that are discharged through the nose and mouth. How much do aerosol emissions vary depending on breathing, conversation, gender, age, etc. USA .
