NH · 11 reporting areas
New Hampshire air quality today
AirNow lists 11 reporting areas in New Hampshire; 5 have a current hourly AQI. The highest current reading is AQI 46 (Good, PM2.5). Preliminary EPA AirNow data; latest reading Oct 28, 2026, 3:00 AM EDT.
All New Hampshire areas
| Area | AQI now | Main pollutant | As of (local) | Today's forecast |
|---|---|---|---|---|
| Cheshire County | 46Good | PM2.5 | 3:00 AM EDT | Good |
| Grafton County | 24Good | Ozone | 3:00 AM EDT | Good |
| Coastal Rockingham County | 19Good | Ozone | 3:00 AM EDT | Good |
| Interior Rockingham County | 19Good | Ozone | 3:00 AM EDT | Good |
| Belknap County | 13Good | PM2.5 | 3:00 AM EDT | Good |
| Carroll County | — | — | — | Good |
| Coos County | — | — | — | Good |
| Hillsborough County | — | — | — | Good |
| Merrimack County | — | — | — | Good |
| Strafford County | — | — | — | Good |
| Sullivan County | — | — | — | Good |
Source: U.S. EPA AirNow reporting area file, published Oct 28, 2026, 3:15 AM EDT. Areas without a number report a category only or have no current reading.
Reading this table
Each area's AQI is the highest of the pollutants its agency reports, usually ozone or fine particles (PM2.5). A reading of 101 or more is Unhealthy for Sensitive Groups. Open an area to see its forecast, nearby monitor readings and health guidance, or see the AQI scale.
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Preliminary data. AirNow readings and forecasts come from federal, state, local and tribal air quality agencies. They are not fully verified, may change, and must not be used for regulatory or official decisions; official data are in EPA's Air Quality System. For the latest official readings and advisories, check AirNow.gov and your state or local air agency.
This page is general information, not medical advice. If you have symptoms or a health condition, follow your doctor's guidance.