Mold in water-damaged buildings produces toxic compounds called mycotoxins that can become airborne and be breathed in. This study developed a precise laboratory method to detect and measure 29 different mycotoxins in indoor air samples. Researchers tested the method in three real mold-infested buildings and successfully identified seven different mycotoxins, proving the method works well even when toxin levels are very low. This breakthrough helps determine whether moldy indoor environments pose serious health risks to workers and occupants.