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