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Patients & Consumers Conditions En Español Find an Allergist / Immunologist Just for Kids New Research Parent Resources Pollen Levels Publications Request a Speaker School Tools Seniors The Virtual Allergist™ Treatments Donate Now Search by Condition (A-Z) Search by Topic Allergy & Asthma Issues Educational Brochures Elements of Allergy and Asthma Order Public Education Materials Allergy Shots Drug Guide Sublingual Immunotherapy (SLIT)		Allergic Conditions: Pollen Pollen is the male fertilizing agent of flowering plants, trees, grasses and weeds. Pollen is a central cause of many allergic reactions. Weather conditions affect pollen levels. The most variant factors influencing different pollen counts from approximately the same region are wind, humidity, and the proximity of the sampling equipment to pollen producing vegetation. Because pollens are small, light and dry, they can be easily spread by wind, which keeps pollen airborne and carries it over long distances. When the air is humid, such as during or after it rains, pollen becomes damp and heavy with moisture, keeping it still and on the ground. Resources about pollen: Pollen Q&A National Allergy Bureau FAQs About Pollen National Allergy Bureau Plant and Pollen Photo Gallery Tips to Remember: Outdoor Allergens Visit an allergist/immunologist to learn more about allergic disease and your own medical condition. To find an allergist/immunologist near you, use the AAAAI's online Physician Referral Directory.
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