The Infectious risk has trended steadily upward over the last 12 weeks, ending the period at its highest level..
Allergy risk activity has held steady over the past 12 weeks in Shiawassee, Michigan.
Pollution risk activity has been climbing over the past 12 weeks in Shiawassee, Michigan.
Weather risk activity has been increasing over the past 12 weeks in Shiawassee, Michigan.
Last updated: July 13, 2026
Data refreshed weekly