Pollen Alerts For River Forest, IL

Pollen Index: 9.7 Pollen Level: high Predominant Pollen: Birch, Maple and Poplar/Aspen/Cottonwood. The quantity of pollen grains in the air for Saturday will be falling but will remain in the high range. The cause for the falling pollen levels is falling temperatures, higher dew points and lack of strong winds.