The Infectious risk has steadily declined over the last 12 weeks, bringing current levels down from earlier weeks..
Allergy risk activity has been easing over the past 12 weeks in Frederick, Virginia.
Pollution risk activity has been climbing over the past 12 weeks in Frederick, Virginia.
Weather risk activity has been increasing over the past 12 weeks in Frederick, Virginia.
Last updated: July 6, 2026
Data refreshed weekly