These microscopic monsters thrive in mattresses and bedding. When their droppings and remains become airborne, your natural filtration system feels under attack.
This fungus flourishes in dark, damp areas such as basements and bathrooms. When mold spores get into the air, they can trigger allergy symptoms.
Little known fact: most people aren't allergic to animal fur, but rather to a protein found in pet dander or saliva.