Pollen

When conditions are right, a plant starts to pollinate. Weather affects how much pollen is carried in the air each year, but it has less effect on when pollination occurs. As a rule, weeds pollinate in late summer and fall. The weed that causes 75 percent of all hay fever is ragweed which has numerous species. One ragweed plant is estimated to produce up to 1 billion pollen grains. Other weeds that cause allergic reactions are cocklebur, lamb's quarters, plantain, pigweed, tumbleweed or Russian thistle and sagebrush.

Source – www.allergybuyersclub.com

Pollen and Airfree

Many people are allergic to pollen, and pollen can be an asthma trigger as well.

Sometimes pollen can contained mold fungi (Aspergillus and Penicillium mucor), becoming even more harmful.

Pollen don’t resist temperatures above 121º C or 250 ºF. Airfree patented ceramic core high temperature fully destroys airborne pollen and any other attached microorganism such as mold.

About Pollen Allergy

Q: What is hay fever?
A: Hay fever is a commonly used term for pollen allergy, a type of seasonal allergic rhinitis (runny nose).

Q: Do pollen allergies occur only in the spring?
A: No. Pollen grains can be dispersed into the air in the spring, summer and fall, depending on the type of tree, grass or weed. For example, ragweed is a common cause of pollen allergy reactions in the fall. In mild climates, some plants pollinate in the winter as well.

Q: Why are some people allergic to pollen while others are not?
A: People inherit a tendency to be allergic, meaning an increased likelihood of being allergic to one or more allergens (such as pollen), although they probably do not inherit a tendency to be allergic to any specific allergens. Children are much more likely to develop allergies if their parents have allergies, even if only one parent is allergic. Exposure to allergens at certain times when the body's defenses are lowered or weakened, such as after a viral infection or during pregnancy, also seems to contribute to the development of allergies.

Q: Which trees and grasses produce the most allergens?
A: Plain-looking trees, grasses and weeds, which do not have showy flowers, produce the types of pollen that most commonly cause allergic reactions. These plants manufacture small, light, dry pollen granules that are custom-made for wind transport. Although most allergenic pollen comes from plants that produce it in huge quantities, it's the chemical make up of the pollen that determines whether it is likely to cause hay fever.

Source - http://www.niaid.nih.gov/newsroom/focuson/allergy99/q&a.htm