The Infectious risk has shown little change over the past 12 weeks, with the most recent week close to the 12-week average..
Allergy risk activity has been trending downward over the past 12 weeks in Multnomah, Oregon.
Pollution risk activity has been increasing over the past 12 weeks in Multnomah, Oregon.
Weather risk activity has been increasing over the past 12 weeks in Multnomah, Oregon.
Last updated: August 24, 2026
Data refreshed weekly