Low Covid-19 risk in Massac, Illinois.
Low Flu risk in Massac, Illinois.
Low Rsv risk in Massac, Illinois.
Low Infectious risk in Massac, Illinois.
Very high Allergy risk in Massac, Illinois.
Low Pollution risk in Massac, Illinois.
Low Weather risk in Massac, Illinois.
Last updated: April 20, 2026
Data refreshed weekly