The Infectious risk has held relatively steady over the past 12 weeks, with high levels persisting through the latest week..
Allergy risk activity has stayed relatively flat over the past 12 weeks in DeKalb, Illinois.
No Pollution activity has been reported over the past 12 weeks in DeKalb, Illinois.
Weather risk activity has been decreasing over the past 12 weeks in DeKalb, Illinois.
Last updated: August 24, 2026
Data refreshed weekly