Tree Pollen We have had some beautiful days this spring but with those days come very high pollen counts. Tree pollen is what affects most people and is the main culprit early in the pollen season. Oak trees are responsible for over eighty percent of tree pollen. When it rains we get a break as the pollen is washed out of the air, if only temporarily. The oak trees should be completely out in the next week and the tree pollen will drop significantly. Sue Kosinsky the co-chief micro-biologist at Walter Reed Army Medical Center Washington, measures our pollen count every day. It is not a simple task to measure the number of grains of each pollen contributor per cubic meter of air. On channel 9 and on our web site we show the pollen count in terms of low, medium and high. I do find the calls and emails requesting the actual pollen count rather amusing. We post the numerical breakdown on our website along with the more generic scale. My daughter suffers from tree pollen allergies but doesn’t change her medication when the pollen count is high, whether the count is 395 or 355 grains per cubic meter. When it’s high it’s high. When tree pollen wanes we move into the grass pollen season during the late spring and summer. The pollen season ends with ragweed in late summer and early fall. When we get the first widespread frost in the fall the pollen season ends except for mold spores.  ¶ 10:53 PM