Pollen Alerts For Chicago/O'Hare International Airport, IL

Pollen Index: 10.4 Pollen Level: high Predominant Pollen: Cedar/Juniper, Maple and Poplar/Aspen/Cottonwood. Concentration of pollen grains in the air for Thursday will be falling but will remain in the very high range. Since the weather has a major influence on pollen dispersal, this decrease is due in part to falling temperatures, rising relative humidity and weaker winds.