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 climbing over the past 12 weeks in Massac, Illinois.
No Pollution activity has been reported over the past 12 weeks in Massac, Illinois.
Weather risk activity has been trending upward over the past 12 weeks in Massac, Illinois.
Last updated: August 24, 2026
Data refreshed weekly