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What is pollen count and how is it determined?

Pollen count: The number of pollen grains landing on a given area during a specified time. The count is taken by a spinning rod that moves through the air at certain intervals. The pollen grains that stick to the rod are specially stained and examined through the microscope.

When do pollen counts go down?

Generally, at ground level, the peak pollen count is between 8:00 a.m. and 12:00 p.m. and again between 5:00 p.m. and 9:00 p.m. Pollen counts fall during times of higher humidity and rise during low humidity. When the humidity goes up, pollen grains absorb moisture, which makes them heavy enough to fall to the ground.

What causes a high pollen count?

Another factor in the increased pollen counts is climate change. Parker said that concentration of carbon dioxide (CO2) have increased in the past 100 years, and plants thrive on increasing levels of CO2.

Are pollen counts higher in the morning or the evening?

So near the source plants, the highest count will be early in the morning. Because pollen travels when it is warm, dry and breezy, pollen counts often peak around noon in urban areas. What time of day the pollen count is highest in an area also depends on what time of the year it is and what plants are growing.


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