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The fact is that about 20% people in North America and Western Europe are suffering from hay fever. 
Hay fever is caused by a seasonal allergy to pollen and mostly airborne allergens that come
from plants. When people inhale the airborne pollens, it triggers specific hypersensitive reactions
releasing the hormone histamine, which causes the common allergic symptoms, like sneezing,
runny nose, congestions or itchy eyes.

If you happened to be the 20% hay fever sufferer, you may want to distinguish which is your sensitive
plant and take precautions before the allergy season. 

 

Trees

Birch (Betula)
Birch species are said to cause severe hay fever 
in Europe and US.Pollen grains are 20-25 µm in diameter.
Flowering season is between March and May.

                                                                                         
 

Japanese-Cedar (Cryptomeria)
Japanese-cedar tends to be the most allergenic pollen type in
Japanand their effect on the allergy suffering public.
Pollen grains are 25-36 µm in diameter.
Flowering season is between January and May. 
 
                                                                                          
 

Oak (Quercus)

Oak is commonly allergenic type in US andAustralia.
Pollen grains are 24-38 µm in diameter.
Flowering season is between late February and April. 

                                                                                          
Sycamore (Platanus)

Sycamore pollen is an important allergenic type
in France,Spain, and Italy. Pollen grains are 18-25 µm
in diameter. Flowering season is between March and April. 

                                                                                         

Grass

Orchard Grass (Cockfoot)

Orchard is said to cause severe hay fever in
Europe and US. Pollen grains are 20-45 µm in diameter.
Flowering season is between April and June.

                                                                                         

Timothy (Phleum)

Timothy is among the worst of the grass genera that
cause pollinosis. This grass has been said to be only second
to orchard in allergenicity among grasses.
Pollen grains are 22-122 µm in diameter.
Flowering season is between April and June.

                                                                                         
 

Bermuda (Cynodon)

This is one of the more significant grass types in terms of allergy
in US and Europe. Pollen grains are 28-30 microns in diameter.
Flowering season is in early summer.

                                                                                         

Rye (Elymus)

Rye grass often induces hay-fever in sensitive individuals in
Europe andAustralia. Pollen grains are 22-122 µm in diameter.
Flowering season is spring and summer.

                                                                                           

Weed
Ragweed (Ambrosia)

Ragweed pollen is arguably the largest single seasonal
allergen in North  America. It also affectsChina,Japan, and Europe.
Pollen grains are 20-27µm in diameter.
Pollen season is between late August and early October.

                                                                                         

Wormwood (Artemisia)

These plants are the most significant cause of
pollinosis after ragweed and the grasses.
Pollen grains are 20-24 µm in diameter.
It flowers from the end of July through November/December.

                                                                                           
 

Plantain (Plantago)

Plantain pollen is considered by some allergists to be
a significant problem, particularly in US.
Pollen grains are 20-39 µm in diameter.
Flowering season is between April and October.

                                                                                         
 

Pigweed (Axyris)

Pigweed often induces hay fever in sensitive individuals in
US andChina. Pollen grains are 21-26 µm in diameter.
Flowering season is summer and fall.

                                                                                         

 

 

 

 

 

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