The Infectious risk has shown little change over the past 12 weeks, with high levels persisting through the latest week..
Allergy risk activity has been trending upward over the past 12 weeks in Henderson, Illinois.
No Pollution activity has been reported over the past 12 weeks in Henderson, Illinois.
Weather risk activity has been easing over the past 12 weeks in Henderson, Illinois.
Last updated: August 24, 2026
Data refreshed weekly