Infectious risk activity has been stable over the past 12 weeks in Mercer, New Jersey.
Allergy risk activity has been increasing over the past 12 weeks in Mercer, New Jersey.
Pollution risk activity has been decreasing over the past 12 weeks in Mercer, New Jersey.
Weather risk activity has been increasing over the past 12 weeks in Mercer, New Jersey.
Last updated: May 25, 2026
Data refreshed weekly