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