Where can I find aspergillus?

Moldy areas. Aspergillus is a mold and would be found in damp areas. Indoors it may be found it wet basements, areas where a roof might have leaked, or in wet soil in potted plants. Outdoors it may be found in mulch, piles of leaves or shady areas.
Aspergillus. This is a common fungus in the environment. It rarely affects the body and usually requires immunosupression such as a cancer patient in treatment or a diabetic in crisis. The infection commonly will be in the lung, but can affect most parts of the body. An infected person usually is severely sick and probably already under a doctor's care - or should be.