Pollen count
Encyclopedia
Pollen count is the measurement of the number of grains of pollen
Pollen
Pollen is a fine to coarse powder containing the microgametophytes of seed plants, which produce the male gametes . Pollen grains have a hard coat that protects the sperm cells during the process of their movement from the stamens to the pistil of flowering plants or from the male cone to the...

 in a cubic meter of air. The higher the number, the more people will suffer if they are allergic to a particular pollen. Usually, the counts are announced for specific plants such as grass, ash or olive. These are tailored to what is usually a common plant in the area being measured.

One method of taking the sample uses a silicone
Silicone
Silicones are inert, synthetic compounds with a variety of forms and uses. Typically heat-resistant and rubber-like, they are used in sealants, adhesives, lubricants, medical applications , cookware, and insulation....

grease covered rod that is rotated in the air to collect the pollen. The rod is rotated periodically during the collection period to gather samples through an entire 24 hour day. The rod is then removed and taken to a lab where the collected material is analyzed for the type of pollen and its concentration.

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