Fall leaves can conceal a hidden hazard: TOXIC MOLD
 
When leaves begin to rot—especially in damp, shaded areas—they create a prime environment for mold growth. Species like Aspergillus, Penicillium, and even Stachybotrys (black mold) can colonize these decaying piles. Moisture from seasonal rains and cooler temperatures slows evaporation, allowing mold to flourish. These molds feed on the organic matter in the leaves, releasing spores into the air as they mature.

Once airborne, mold spores can travel significant distances, especially on windy days or when disturbed by raking or yard work. Inhaling these spores can trigger allergic reactions, respiratory inflammation, and in more severe cases, toxic mold illness. This condition—also known as mycotoxicosis—occurs when individuals are exposed to mycotoxins, the harmful compounds some molds produce.

Even brief exposure during outdoor activities like gardening or leaf cleanup can lead to lingering symptoms. Mold spores can lodge in the nasal passages and sinuses, where they may colonize and cause ongoing inflammation. Wearing a mask while handling leaves, changing clothes before entering your home, and irrigating nasal passages afterward with saline or Xlear are smart preventative steps.