As opposed to one or three?
In: Biology
Speculative take from studying biology (but not this area):
Bilateral symmetry, having two of things is pretty common. One would also be an option, but makes two much more straight forward than 3/5/+.
Backup / redundancy. If something is important, it’s often nice to have two if it’s not a horrible extra cost. It means you can survive one being damaged/lost/defunct.
I loosely heard sometimes small variations in airflow strength between nostrils can influence the “smells” you detect. A la, one passage way at any given time might be “more clear” than the other, meaning as you breath in, the scent profile might be a bit broader because one is taking in smells quickly, and the other slowly/more lingeringly.
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