Why do you have boogers?

Mucus production: The inside of your nose is lined with mucous membranes, which produce mucus. Mucus is a sticky, gooey fluid that helps trap dust, pollen, bacteria, and other irritants before they can reach your lungs.

Trapping foreign particles: As you breathe in, the mucus in your nose catches airborne particles. These particles can include dust, pollen, smoke, and bacteria. The mucus prevents these particles from reaching your lungs, where they could cause irritation or infection.

Moving the particles: Once the mucus has trapped the foreign particles, tiny hairs called cilia sweep it towards the back of your throat. You then either swallow the mucus or blow it out of your nose.

Protection from dehydration: Mucus also helps to keep the inside of your nose moist. This is important because dry nasal passages can be irritated and more susceptible to infection.

Overproduction of mucus: Sometimes, your body can produce too much mucus. This can be due to a cold, flu, allergies, or other respiratory infections. When you have too much mucus, it can build up in your nose and cause congestion. You may also feel the need to constantly blow your nose or sniffle.