The Infectious risk has shown little change over the last 12 weeks, with the most recent week close to the 12-week average..
Allergy risk activity has been climbing over the past 12 weeks in Hillsborough, New Hampshire.
No Pollution activity has been reported over the past 12 weeks in Hillsborough, New Hampshire.
Weather risk activity has been decreasing over the past 12 weeks in Hillsborough, New Hampshire.
Last updated: August 31, 2026
Data refreshed weekly