Pollen Forecast for San Mateo, California
Medium
Alder, Elm and Ash
Today
The amount of pollen in the air for Tuesday will not change appreciably and will remain in the moderate range. This lack of change in airborne pollen will continue to affect those who suffer from allergies and those who live with the allergy sufferers.
Outlook
The quantity of pollen grains in the air for Wednesday will be falling in the moderate range. The cause for the falling pollen levels is rising humidity, weak winds and expected precipitation in the evening which tends to wash pollen out of the air.