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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 .
Additionally, plants that cause contact allergies (such as rashes or itching), or that are highly poisonous when ingested even though their pollen does not cause respiratory allergies, are never given low ratings. [1] Low allergy ratings are considered to be 1 through 3 on the allergy scale.
A pollen calendar can be a very useful tool in forensic science, because it can be used to place the month, or week, or date of death. [4] [5] The use of pollen for criminal investigation purposes is called "forensic palynology". [6] [4]
Here's the setup. High pressure will move from Tennessee to offshore overnight. The Cape Fear region will see brisk northwest winds today, giving way to a warmer flow by mid-week.
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Pollen cores being taken at Fort Bragg, North Carolina. A pollen core is a core sample of a medium containing a stratigraphic sequence of pollen.Analysis of the type and frequency of the pollen in each layer is used to study changes in climate or land use using regional vegetation as a proxy.
The Office of Management and Budget (OMB) has designated more than 1,000 statistical areas for the United States and Puerto Rico. [2] These statistical areas are important geographic delineations of population clusters used by the OMB, the United States Census Bureau, planning organizations, and federal, state, and local government entities.
Helianthus annuus pollen. Pollen zones are a system of subdividing the Last Glacial Period and Holocene paleoclimate using the data from pollen cores.The sequence provides a global chronological structure to a wide variety of researchers, such as geologists, climatologists, geographers and archaeologists, who study the physical and cultural environment of the last 15,000 years.