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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 ]
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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 .
If feasible, avoid going outside on high pollen count days, especially in the early morning or midday. While inside, close your windows and have the air conditioning running.
Ambrosia cordifolia, called the Tucson bur ragweed, [3] is a North American species of plant in the family Asteraceae. It is native to northern Mexico (Sonora, Sinaloa, San Luis Potosí, Guanajuato, Baja California Sur) and the State of Arizona in the United States. [4] [5] [6] Ambrosia cordifolia is a shrub up to 50 cm (20 inches) tall. Leaves ...
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However, the use of a pollen calendar to set the date of death should be used with extreme caution, and only by a carefully trained expert witness. [7] The CSI effect has put pressure on some police officers and district attorneys to provide pollen-based evidence , but such evidence "appear[s] to be of limited use in the forensic context where ...