Pollen grains are released by trees, flowers and other plans with to fertilize other plants of the same species. An allergy to pollen is one of the most allergic reactions is the USA.
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Tree Pollen Allergy Symptoms and Types
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Met Office on X: There are around 30 different types of #pollen that cause #hayfever and you can be allergic to more than one type / X
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Why Does Pollen Cause Allergies? New York Allergy and Sinus Centers
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Pollen Allergy Allergy & Asthma Network