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How does one obtain a count for allergens that are in outdoor air?

April 26, 2017air ALLERGENS obtain Outdoor

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How does one obtain a count for allergens that are in outdoor air?

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A greased rod is spun in the air at regular intervals for 24 hours. When the rod is removed the laboratory counts the number of pollen grains on the rod. A known volume of air has been sampled and the count is reported in grains per cubic meter of air. This number is used to give an indication of whether or not the concentration of certain pollen is low or high. This should help Doctors and allergy sufferers, who follow allergy reports, to know which pollen are in the air and what the concentration is.