The Infectious risk has eased over the past 12 weeks, ending the period well below its earlier peak..
Allergy risk activity has been decreasing over the past 12 weeks in Union, South Dakota.
No Pollution activity has been reported over the past 12 weeks in Union, South Dakota.
Weather risk activity has held steady over the past 12 weeks in Union, South Dakota.
Last updated: July 6, 2026
Data refreshed weekly