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Some Common Allergens
Outdoor mold spores, usually found in moist, shady areas, are so tiny they can evade the protective mechanisms of the nose, and cause allergy symptoms such as runny nose, congestion, and sneezing.
Certain types of grasses, such as Timothy, Johnson, and Bermuda, and Kentucky bluegrass, produce highly allergenic pollen.
Allergy sufferers should try to avoid certain types of trees during springtime, including oak, elm, birch, ash, hickory, poplar, sycamore, maple, cypress, western red cedar, and walnut.
Small flowers with little color tend to cause more allergy symptoms than large, brightly colored flowers with heavy, waxy pollen.