The main tree
present in North America, which are responsible for seasonal allergic
symptoms, include the ,
, , ,
, and ,
while the main grass pollens include , , ,
, and different types of (for example annual and Kentucky).
Weed pollens include the ,
and but it is the
that causes the most problems in North America.
It should be noted that the presence of these pollens
varies between regions. To get a more accurate picture of the pollens
present in a particular region and for a pollen forecast, check out
the ' Pollen and Spore ' section of the American Academy of Allergy,
Asthma and Immunology Online [ ] .
American Academy of Allergy, Asthma and Immunology Online :