Pollen Alerts For Ottawa, IL

Pollen Index: 9.9 Pollen Level: high Predominant Pollen: Maple, Birch and Oak. Based on past pollen counts and expected weather conditions, pollen levels for Thursday will be falling but will remain in the high range. This forecast of lower pollen concentration is based on rising humidity, weak winds and expected precipitation in the evening which tends to wash pollen out of the air.