Why do I have hair in my nose? Do they have a biological purpose? Is hair in my nose an evolutionary benefit my genes been selected for?
They act as a pre-filter for coarse particles.
To keep dust and gnats and bits of food out of your very delicate lungs.
Also, to prevent uncontrolled avalanche of boogers from rolling down your upper lip into your mouth or onto your lap. 
So, do I get punched in the nose hairs if I say they have no purpose? 
They have a consequence or two: They act as very basic, first-stage air filters for the lungs. I don’t know how selective processes have affected their presence in humans, because it’s not (hehehe, it’s snot) possible to ensure you that some hairless wonders have been slightly less successful at passing down their hairless nose characteristics, because I don’t know if hairless nose people ever really got a crack at the whole survival thing.
I supposed, but don’t know for sure since I have never looked closely for it and value my too much to ask, that women are less hairy than men - also in the nose department. They seem to be surviving alright though.
We women may have less nose hair, but we still have nose hair, and it’s still coarse and spiky and stuff and so would still serve a filtering function, if that’s what it’s there for.
One of Mike Rowe’s Dirty Jobs recently was at a spa, and one of his de-hairing jobs on the hapless Barsky was removing Barsky’s nose hairs with a big Q-tip coated with wax. Ouch! I assume this is done for aesthetic purposes, and the spa owner said there are hairs higher up that are necessary for respiratory health.
That’s all I got. I think yanking out nose hairs is a bad idea, they’re there for a purpose. They can be trimmed with tiny scissors if they’re hanging out of the nostrils.
Yanking can lead to an infected follicle that hurts like heck.
Anyway, like everything else from eyes to ears, they have no purpose.
Nose hair waxing? :eek::eek:
That’s just wrong.
I’d also worry about the increased risk of infection, given how often the nares are colonized with Staph Aureus.
I’ll note that actors typically have it all shaved/cut/waxed out-would look gross on all those closeups.
Only for extremely pedantic definitions of “purpose”. What, it’s not sentient, so it doesn’t have a purpose? My chair has a purpose. My car has a purpose. My nose hairs have a purpose- to keep me healthy.
My wife says it’s because I’m really a bear. Or a werewolf.
I think it’s the other way around, the loss of nose hair was selected against when we were shedding the bulk of our body hair. It would probably take a lot less actual benefit to retain nose than it would have to acquire it in a previously hairless place.
Which makes me wonder just how widespread is nose hair in the animal kingdom?
When waxing my nose, I like to keep a small strip of hair stretching all along my meatus.
No, for fighting ignorance, if one accepts evolution, then what you are left with is things that have consequences. It’s just a way of fending off issues over design and/or intention.
What is the purpose of fingers? Answering that means answering what might be a loaded question. I accept that fingers were not designed. They don’t have a purpose, but they have consequences.
Purpose requires an intelligent mind behind it. Pick up a rock and use it for a paperweight, it now has purpose. Since you probably didn’t install them there, your nose hairs don’t have a purpose as such.
I prefer function. A rock falling on you is a consequence of gravity. Claws shredding you is them performing their function. The products of evolution may not be designed in the human sense, but they aren’t random globs of material either.
To keep out dandelion seed fluff. Anything smaller gets through.
And it has one: us. It needn’t be the person who created something to give it purpose. Though I do agree that function is a better word, since we don’t consciously use the hairs.
A bearwolf?