New Hampshire(NH)
Air quality overview and monitoring data — 2025
166
Monitoring Sites
2,377
Active Monitors
10
Counties with Data
39
Cities Monitored
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County Air Quality
| County | Median AQI ▲ | 90th %ile | Max AQI | Good | Moderate | USG | Unhealthy |
|---|---|---|---|---|---|---|---|
| Belknap | 34 | 52 | 92 | 240 | 33 | 0 | 0 |
| Cheshire | 38 | 58 | 115 | 210 | 61 | 2 | 0 |
| Grafton | 38 | 56 | 113 | 222 | 48 | 3 | 0 |
| Hillsborough | 38 | 56 | 123 | 226 | 44 | 4 | 0 |
| Merrimack | 38 | 47 | 90 | 117 | 5 | 0 | 0 |
| Rockingham | 39 | 55 | 115 | 226 | 47 | 1 | 0 |
| Coos | 40 | 58 | 119 | 234 | 36 | 4 | 0 |
Pollutant Trends
Ozone
No data available
PM2.5
No data available
PM10
No data available
CO
No data available
NO2
No data available
SO2
No data available