My windpipe runs down my neck. It takes the air into my lungs. This long air tube cleans my air even more. Don't confuse this with the tube that takes food to my stomach!
Both my windpipe and my nose have "slime" in them. This sticky stuff is great because it catches the dirt carried in by the air. Its real name is mucus. When I have a cold, I make too much mucus so I blow my nose a lot more often to empty it out.