The water damaged building associated molds are more likely to produce toxins which harm both microscopic neighbors and other larger organisms like humans. Not only do they make toxic chemicals, they also inhabit closed environments – our homes, our offices, and other buildings – where their toxins can accumulate. If outdoors, even these molds may never concentrate enough airborne toxin due to winds and the sheer volume of space. Indoors, especially if ventilation is poor, they can accumulate to create a toxic punch for the unsuspecting and genetically vulnerable.