The Infectious risk has shown little change over the last 12 weeks, with high levels persisting through the latest week..
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 remained stable over the past 12 weeks in Williamson, Illinois.
Last updated: August 24, 2026
Data refreshed weekly