Pollen: One of the most common seasonal allergens, pollen is released by trees, grasses, and weeds. Common triggers include ragweed, birch, cedar, and oak trees. Pollen can travel for miles, affecting those with seasonal allergic rhinitis (hay fever).
Dust Mites: Tiny creatures that live in bedding, carpets, and upholstered furniture, dust mites are a common year-round allergen. They thrive in warm, humid environments.
Mold: Mold grows in damp environments, both indoors and outdoors, and can cause allergic reactions when spores are inhaled. Common molds include Alternaria, Cladosporium, and Aspergillus.
Pet Dander: Proteins in the skin flakes, saliva, and urine of animals (especially cats and dogs) can trigger allergic reactions in sensitive individuals.
