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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 .
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46% of Americans have seasonal allergies — and 22% have missed work or school because of it, new Yahoo/YouGov poll finds
Ragweed pollen can remain airborne for days and travel great distances, and can even be carried 300–400 miles (500–600 km) out to sea. [12] Ragweeds native to the Americas have been introduced to Europe starting in the nineteenth century and especially during World War I , and have spread rapidly since the 1950s. [ 15 ]
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Ambrosia chamissonis is a species of ragweed known by the common names silver burr ragweed, silver beachweed and (silver) beach bur(r). [ 3 ] It is known from most of the coastline of western North America from Alaska to Baja California , where it is a resident of beaches and other sandy coastal habitats.