Infectious risk activity has been decreasing over the past 12 weeks in Massac, Illinois.
Allergy risk activity has been increasing 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 stable over the past 12 weeks in Massac, Illinois.
Last updated: May 25, 2026
Data refreshed weekly