Molds are rated at a high level of irritation. Grass pollens are still mild, said Machado, but can be expected to start stinging eyes in the next two to three weeks. Dr. Ron Brown, an allergist at the NorthBay Medical Center clinic in Vacaville, said grass is a major allergy creator when pollinating at its highest. He said that point normally would be reached at the end of February and early March, but with heavy rains, grass pollen is not at its most powerful stage. Alfalfa will also be in peak pollinating phase at that time.
Pollen counts are low after rain.
The droplets force the pollen to the ground. Windy days make for high pollen count. According to the National Allergy Bureau, molds are creating the highest pollen count in the area with a count of 5,722 grains per cubic meter. Trees are at 23 grains per cubic meter, which makes for a moderate level. Weeds are also at a moderate level.