: Secondary electron image of a. human hair with a nanowire loop sitting on it. The diameter of the nanowire is equivalent to. the scale in the shale picture to the left. The. hair is about 60,000 nanometers in diameter.
Allergies come in different forms, so not everyone who has a pollen allergy is allergic to tree pollen. A palm tree allergy is indicative of your bodyâs reduced immunity to pollen, which can sometimes be genetic. When your body comes into contact with tree pollen, it releases histamine, the aggravator of common allergy symptoms. There are certain types of palm trees that donât exhibit pollen, such as Phoenix palms, so it is always important to identify the differences before planting any new trees in your yard.
As the trees bloom, they release tiny grains of pollen that are scattered by the wind. A single birch tree can produce up to five million pollen grains, with many traveling distances of up to 100 yards from the parent tree. Oak Pollen Allergy. Like birch trees, oak trees send pollen into the air during the spring. While oak pollen is considered to be mildly allergenic compared to the pollen of other trees, it stays in the air for longer periods of time. This can cause severe allergic reactions in some people with pollen allergies. Grass Pollen Allergy