Infectious risk activity has been stable over the past 12 weeks in Harford, Maryland.
Allergy risk activity has been increasing over the past 12 weeks in Harford, Maryland.
No Pollution activity has been reported over the past 12 weeks in Harford, Maryland.
Weather risk activity has been increasing over the past 12 weeks in Harford, Maryland.
Last updated: May 25, 2026
Data refreshed weekly