Infectious risk activity has been decreasing over the past 12 weeks in Williamson, Illinois.
Allergy risk activity has been increasing over the past 12 weeks in Williamson, Illinois.
No Pollution activity has been reported over the past 12 weeks in Williamson, Illinois.
Weather risk activity has been decreasing over the past 12 weeks in Williamson, Illinois.
Last updated: May 25, 2026
Data refreshed weekly