Aspergillus is a mold, and yes, it's found in the air, but not in a form where it emits mycotoxins. It's when it combines with a protein source such as soil, peat, etc. that it becomes nasty. In the air it's not really feeding off of anything and so not producing any nasty metabolites.
Are not the mucus membranes proteinaceous?
Since it's in the air, could it not settle onto any other substrate (aside from news paper) and start to grow.