The Role of Nostrils in Passport Photos

Nostrils, also known as nares, are the two openings in the nose through which air is inhaled and exhaled. They are separated by the septum, a thin wall of cartilage.

Nostrils play a significant role in breathing and smell. They filter and warm the air entering the nasal cavity before it reaches the lungs. Tiny hairs called cilia and a layer of mucus help trap dust, germs, and other foreign particles, protecting the respiratory system. Nostrils can also provide insights into a person's health; for example, the presence of discharge can indicate an infection or allergies.

Rules for Nostrils in Passport Photos

The rules and guidelines for passport photos, including those related to facial features like nostrils, mainly focus on a clear and accurate representation](/glossary/passport-photo-resemblance "Resemblance in a Passport Photo") of the person. There aren't specific rules about nostrils, per se, but rather general guidelines about the face and head.