The Infectious risk has fallen noticeably over the last 12 weeks, bringing current levels down from earlier weeks..
Allergy risk activity has been decreasing over the past 12 weeks in Mason, Washington.
Pollution risk activity has been trending upward over the past 12 weeks in Mason, Washington.
Weather risk activity has been climbing over the past 12 weeks in Mason, Washington.
Last updated: August 24, 2026
Data refreshed weekly