Mar 24 2008
Allergen Series: Pollen
Pollen grains are produced by plants, weeds and trees to reproduce. Pollen released by a plant reaches a flower of the same species and is then fertilized. Other flowers can fertilize itself. Pollen is transferred through insects and mainly through the wind current. Since pollen are very tiny and lightweight, it can be carried by the wind in long distances, up to 400 miles away from the sea shore, and up to two miles up in the atmosphere.
Pollen production and release depend on the length of day time and night time, therefore the schedules depend on geographical location, rather than seasons. But the spread of pollen depends on the wind intensity and direction.