The Infectious risk has shown a gradual decrease over the past 12 weeks, ending the period well below its earlier peak..
Allergy risk activity has been trending downward over the past 12 weeks in Columbia, Washington.
Pollution risk activity has been trending upward over the past 12 weeks in Columbia, Washington.
Weather risk activity has been trending upward over the past 12 weeks in Columbia, Washington.
Last updated: August 24, 2026
Data refreshed weekly