New Hampshire Air Quality
Real-time AQI data and air quality trends for 41 cities across New Hampshire.
Statewide Air Quality Overview
38
Average AQI
1475
Good Air Days
274
Moderate Days
Unhealthy Days
123
Highest AQI
Based on 2025 EPA data
Learn About Air Quality
What Is the AQI?
Understand how the Air Quality Index is calculated and what each level means for your health.
Pollutant Guide
Learn about PM2.5, ozone, and other pollutants that affect air quality across New Hampshire.
National Rankings
Compare New Hampshire cities to the rest of the US by air quality grade and median AQI.