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What is Pollen Count?

By Debra Durkee
Updated Jun 04, 2024
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The pollen count is a number that indicates the amount of airborne allergens that are present per cubic meter of air. These numbers are compiled by volunteers at institutions such as universities, medical centers, research facilities, and clinics, and have been an important part of the weather forecast since the beginning of the 20th century. The higher the pollen count, the more severely allergy sufferers will feel their symptoms.

Volunteer agencies collect samples of the air on clear, sticky surfaces. The sample is viewed under a microscope, and each grain of pollen is counted and identified. The pollen count includes all the possible allergens in the air during the past 24 to 72 hours. Based on these numbers, projections are made as to how much pollen will be in the air for anywhere up to the next four days.

Pollen counts are given on a scale of zero to 12. Pollen are microscopic molecules that are light and dry; easily carried by the wind, a single type of pollen can impact a large area. Typically, pollen counts are given for city-wide or county-wide areas, as the process is a time-consuming one that can involve hours of work.

Air sampling devices are often placed on rooftops or in other open spaces, allowing for a collection sample from a wide area. There are more than 1,200 plants, trees, flowers, and weeds that can potentially cause allergies, and these are all measured in the pollen count. The pollen in the air is dependent on the season, although related plants can cause similar reactions in sensitive people. While exact pollen counts vary from year to year, those who follow them will learn when to expect a spike in the pollens that impact their health the most.

Pollen counts are never exact, and numbers taken in the same city can be quite different. Weather conditions can have a drastic impact on numbers, as one sample collected after a rainstorm will have a considerably lower pollen count than one taken in the same city before the rain. The location of the air samplers can also result in different readings, especially if one is located in the middle of a developed area and the other is on the outskirts of town, near a park, or in close proximity to more vegetation.

All Things Nature is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
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