Empty Nose Syndrome is a rare condition that some people experience which causes some people who otherwise have clear nasal passages to experience a range of symptoms which are most commonly feelings of nasal obstruction, nasal dryness and crusting, and a sensation of being unable to breathe.
Vaseline and Salt Water rinses of the nasal passages can help protect the lining of the lower nose from drying out but other than that it's hard to treat empty nos syndrome but thankfully empty nose syndrome is not all that common.