Low Covid-19 risk in Mercer, New Jersey.
Low Flu risk in Mercer, New Jersey.
Low Rsv risk in Mercer, New Jersey.
Low Infectious risk in Mercer, New Jersey.
High Allergy risk in Mercer, New Jersey.
Low Pollution risk in Mercer, New Jersey.
Low Weather risk in Mercer, New Jersey.
Last updated: April 20, 2026
Data refreshed weekly