Infectious risk activity has been stable over the past 12 weeks in Marin, California.
Allergy risk activity has been increasing over the past 12 weeks in Marin, California.
No Pollution activity has been reported over the past 12 weeks in Marin, California.
Weather risk activity has been increasing over the past 12 weeks in Marin, California.
Last updated: May 24, 2026
Data refreshed weekly