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Outdoor allergies (also called “seasonal allergic rhinitis” [SAR], “hay fever,” or “nasal” allergies) occur when allergens that are commonly found outdoors are inhaled into the nose and the lungs causing allergic reactions. Examples of commonly inhaled outdoor allergens are tree, grass and weed pollen and mold spores. Other allergens exist outdoors, such as stinging insects and poisonous plants, but these are usually considered “contact,” “skin” or “insect” allergens rather than “inhaled” allergens.

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