Not hard for those of us who live in the hurricane zone.
My father-in-law rented a house when he moved to a new town.
He and his girlfriend were in it for less than two weeks before their houseplants started dying and they both got bronchial infections.
The mold was an undisclosed, recurring problem from Hurricane Floyd-related flooding.
The house was finally torn down because the mold could not be controlled.
At work here in florida, half our roof was torn out...and they are removing TONS of walls. The mold in my area of the building was making me so sick. I think I have mildew in my home also...although I don't see it. I need to find something that can detect mold in the air.