Infectious Diseases prevalence is Extreme in Seattle, and Moderate in Everett and Tacoma.
Allergy prevalence is Low in Seattle, Everett, and Tacoma.
Pollution prevalence is Very High in Seattle, and Low in Everett and Tacoma.
Severe Weather prevalence is Low in Seattle, Everett, and Tacoma.
Last updated: November 9, 2026
Data refreshed weekly