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At the entrance of the nose you’ll find there are two holes called nostrils they’re separated by something called a septum. When you breathe in, the air enters the nasal passage and heads into your nasal cavity.
The nasal cavity is a space in your head behind your nose. From the nasal cavity the air heads down the hill near the trachea or windpipe and ends up in the lungs then the whole process happens in reverse when you exhale.
But you can also breathe through your mouth. The nose is a lot more than a hole to breathe through, it also warms, moistens, and filters the air before it enters the lungs.
The inside of the nose is lined with a moist thin layer of tissue called a mucous membrane which makes mucous that sticky stuff in your nose not works with your nose hairs to capture dust germs and 
other small particles that could irritate your lungs when the mucus dirt and other debris dry and clump together. When it’s protecting your lungs, your nose captures something it needs to get rid of .
Your nose can smell what it smells because of the olfactory epithelium. Olfactory is a four things that have to do with smelling. The olfactory epithelium contains special receptors that notice them then the receptor sends signals along the olfactory nerve through the olfactory bulb. Those signals then go to the old important brain so that’s how you know if you smell orange, bread, or steak 😆
Five tips Google gives you to protect your own nose:
- Avoid carpets as much as possible.
- Don’t let dust accumulate in your home.
- Clean your house regularly.
- Maintain proper humidity levels in your home.
- Avoid smoking or inhaling second-hand smoke.
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