Well, we have been having a constant and steady flow of sand that is blown all the way from Africa, dusting our states for a bit now.. Sand is not alone in its journey to the states from Africa. I peek at the air quality map for the world every once in a while, every time I do, where that sand it blowing off the continent.. it is usually poor to hazardous in quality. Just a thought on where new molds spores may be coming from, specially in the hot areas like Texas/Az.