The Infectious risk has held relatively steady over the last 12 weeks, showing no notable shift in recent weeks..
Allergy risk activity has been trending upward over the past 12 weeks in Mason, Illinois.
No Pollution activity has been reported over the past 12 weeks in Mason, Illinois.
Weather risk activity has held steady over the past 12 weeks in Mason, Illinois.
Last updated: August 24, 2026
Data refreshed weekly