March

The spring tree pollen season continues. It goes into high gear in March and remains at high levels through April as the local trees go through their annual reproductive cycle. Eastern red cedar and elm pollen are still present in the atmosphere in high concentrations. Both types gradually decrease throughout the month and are often at low levels by the end of March. Because of the variety of trees that are pollinating by mid-March, the total atmospheric concentrations may be higher than February. The following are the most important species that typically begin pollinating in March:

From this list special attention should be paid to oak. There are 26 oak species native to Oklahoma. In addition, other oak species are used as ornamentals. Oak pollen is allergenic, and it is frequently the most abundant pollen on a cumulative yearly total.