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Pollen, a mass of microspores in a seed plant, usually appearing as a fine dust and varying greatly in shape and structure. Eachpollengrain is formed in the male structures of seed-bearing plants and is transported by various means to the female structures to facilitate fertilization of the ovules.
To a tree or a flowering plant,pollenis necessary for life. But to millions of Americans, it is a source of seasonal misery.Pollen, a fine to coarse powdery substance, is created by certain plants as part of their reproduction process. It can appear from trees in the spring, grasses in the summer, and weeds in the fall.
Pollenallergies affectmorethan 25 million people in the U.S. Learn about how you can tell if you have an allergy topollenandwhat to do about it.
Allergens andPollenWhat to knowPollenis an airborne allergen. Climate change may increasepollenconcentrations and extendpollenseasons, heightening health effects formorepeople.
Pollengrains take an endless array of fascinating shapes with all manner of textures andfeatures. Dan Kitwood/Getty Plants evolvedpollenas a reproductive meansmorethan 375 million years ago, and since then, they haven't looked back [source: Dunn].
Is allergy season changing? With climate change, winters are milder and growing seasons are longer, meaning there'smoreopportunity forpollento stay in the air, resulting in longer andmoresevere allergy seasons. In many areas across the country,pollencounts have broken decades of records.
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