The Infectious risk has shown little change over the last 12 weeks, with the most recent week close to the 12-week average..
Allergy risk activity has remained stable 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 easing over the past 12 weeks in McLean, Illinois.
Last updated: August 24, 2026
Data refreshed weekly