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