Are you saying that all particulates in the air inside a house are mold spores? Surely the vast majority is just normal dust (dander, microplastics, silicates, etc.)?

Dust becomes mold rapidly.

Way more rapidly than anyone’s comfortable.

Ambient air has mold spores.

Add a single humid breeze through the space, game over.

If you don’t have a humidity range being recorded day to day in your home, you may be surprised the excursions.