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By Thursday, we should see another burst of pollen across the region. Maples and elm join the mix this week as Bradford pears pass their peak. Pollen counts will surge with warm dry weather.
A pollen count is a measurement of the number of pollen grains in a given volume of air. Pollen counts, and forecasts of pollen conditions, are routinely produced and reported to the public because high aerial pollen concentration is associated with increased rates of allergic reaction for those with conditions such as hay fever and asthma.
Allergic rhinitis; Other names: Hay fever, pollenosis: SEM Microscope image of Pollen grains from a variety of common plants: sunflower (Helianthus annuus), morning glory (Ipomoea purpurea), prairie hollyhock (Sidalcea malviflora), oriental lily (Lilium auratum), evening primrose (Oenothera fruticosa), and castor bean (Ricinus communis).
Pollen allergy seasons can be very different depending on where in the U.S. you are. Here are the 10 best and worst cities for people with allergies.
A thunderstorm in Tamworth, New South Wales, Australia Colourised scanning electron microscope image of pollen grains from a variety of common plants. Thunderstorm asthma (also referred to in the media as thunder fever or a pollen bomb [1]) is the triggering of an asthma attack by environmental conditions directly caused by a local thunderstorm.
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Its pollen is wind-dispersed, and can be a strong allergen to people with hay fever. [4] [10] It produces 2–4 mm obconic green to brown fruit. [9] It sets seed in later summer or autumn. Since the seeds persist into winter and are numerous and rich in oil, they are relished by songbirds and upland game birds. [4]