What is a booger?

The mucous membrane that lines your nose is moist and sticky. That environment helps trap dust and other things in the air before they can pass into your lungs. When moisture evaporates from the thick film of mucus that covers the lining of your nose—which happens all the time as air passes over it—the mucus, combining with the particles you’ve breathed in, becomes dried and crusty, forming boogers.


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