April Pollen

The spring tree pollen season continues and reach peak levels in April Because of variety of trees that are pollinating by mid-April, the total atmospheric concentrations are higher than any other month of the year. The following are the most important species that typically pollinate in April:

Oak (Quercus spp.)

Sycamore (Platanus americana)

Ash (Fraxinus americana and F. pennsylvanica)

Cottonwood (Populus deltoides and P. alba)

Hackberry (Celtis laevigata and C. occidentalis)

Birch (Betula nigra)

Mulberry (Morus spp)

Pine (Pinus spp.)

Willow (Salix spp.)

Hickory and Pecan (Carya spp)

From this list special attention should be paid to oak. There are 26 species of oaks that are native to Oklahoma. In addition, others species are used as ornamentals. Oak pollen is allergenic and it is the most abundant pollen type in April. In addition, oak pollen is frequently the most numerous pollen on a cumulative yearly basis.