The Infectious risk has climbed over the past 12 weeks, with the most recent week notably higher than earlier in the window..
Allergy risk activity has stayed relatively flat over the past 12 weeks in Mercer, Illinois.
Pollution risk activity has been trending upward over the past 12 weeks in Mercer, Illinois.
Weather risk activity has held steady over the past 12 weeks in Mercer, Illinois.
Last updated: July 6, 2026
Data refreshed weekly