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Ambrosia trifida, the giant ragweed, is a species of flowering plant in the family Asteraceae. It is native to North America , where it is widespread in Canada , the United States , and northern Mexico .
Ragweed pollen is a common allergen. A single plant may produce about a billion grains of pollen per season, [ 11 ] [ 12 ] and the pollen is transported on the wind. It causes about half of all cases of pollen-associated allergic rhinitis in North America, where ragweeds are most abundant and diverse. [ 8 ]
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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The latest forecast for the Sacramento area calls for high pollen levels, according to the Weather Channel. Tuesday’s pollen count is expected to be high, the forecast said.
Allergic rhinitis is the type of allergy that affects the greatest number of people. [12] In Western countries, between 10 and 30% of people are affected in a given year. [ 2 ] [ 7 ] It is most common between the ages of twenty and forty. [ 2 ]
46% of Americans have seasonal allergies — and 22% have missed work or school because of it, new Yahoo/YouGov poll finds
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