North Haverhill, New Hampshire Air Quality
North Haverhill has a median AQI of 38, earning an air quality grade of A — excellent air quality that ranks better than 70% of US cities. Air quality has remained relatively stable over the past decade. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2025, North Haverhill recorded 222 good air quality days (81% of monitored days) and 3 unhealthy days.
Population: 728 • County: Grafton
Current AQI
Quick Facts
| Current AQI | 14 — Good |
| Air Quality Grade | A |
| Median AQI (2025) | 38 |
| vs. U.S. Cities | Better than 70% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 3 |
| 10-Year Trend | → Stable |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for North Haverhill is sourced from the Laconia Main St monitoring area, located approximately 48 miles from city center. This EPA-certified station continuously tracks ground-level ozone, the primary driver of air quality alerts in this area.
North Haverhill typically sees its worst air quality during summer afternoons when heat and sunlight drive ground-level ozone formation from vehicle and industrial emissions. Morning readings are generally 15–25 points lower than afternoon peaks. Outdoor activity is best planned for early morning on high-ozone days.
AQI Trend (10 Years)
Air Quality Days by Year
North Haverhill Median AQI by Year
Annual EPA air quality data for North Haverhill — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 38 | 222 | 3 | 113 | Ozone |
| 2024 | 35 | 334 | — | 80 | Ozone |
| 2023 | 37 | 311 | — | 100 | Ozone |
| 2022 | 36 | 330 | — | 84 | Ozone |
| 2021 | 36 | 313 | 1 | 106 | Ozone |
| 2020 | 35 | 344 | — | 70 | Ozone |
| 2019 | 35 | 332 | — | 65 | Ozone |
| 2018 | 39 | 294 | — | 90 | Ozone |
| 2017 | 38 | 294 | — | 80 | Ozone |
| 2016 | 36 | 321 | — | 77 | Ozone |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About North Haverhill Air Quality
What is the air quality in North Haverhill today?
The current AQI in North Haverhill is 14, rated "Good". Air quality is good — outdoor activity is safe for everyone today. Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in North Haverhill getting better or worse?
Air quality in North Haverhill has been stable. The median AQI has risen 2 points (from 36 in 2016 to 38 in 2025).
What is the most common air pollutant in North Haverhill?
Ozone is the primary air pollutant in North Haverhill, responsible for 157 days (58% of monitored days) in 2025. Ground-level ozone forms when sunlight reacts with emissions from vehicles and industry, typically peaking on hot summer afternoons.
How many unhealthy air days does North Haverhill have per year?
In 2025, North Haverhill recorded 81% good air quality days (222 days) out of 273 monitored days. There were 3 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 113.
What air quality grade does North Haverhill receive?
North Haverhill receives an air quality grade of A, placing it better than 70% of US cities. This is based on a median AQI of 38 in 2025, with 222 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 70% of US cities
Nearby Cities
Get AQI Alerts
Receive notifications when air quality changes in North Haverhill
National Rankings
See how North Haverhill compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for North Haverhill
North Haverhill has a summer ozone problem — hot afternoons push AQI into Moderate or higher as sunlight converts vehicle and industrial emissions into ground-level ozone. Activated carbon and PECO filters chemically neutralize ozone rather than just trapping particles.
Blueair Blue Pure 211+
High performance for large rooms with simple operation.
- ✓Good room size match
- ✓Recommended for your air quality
- ✓High performance
We may earn a commission from purchases
Other Great Options
Molekule Air Pro
Commercial-grade with patented PECO technology for destroying pollutants.
Honeywell HPA300
Powerful workhorse for large rooms. Built to last.
RabbitAir MinusA2
Stylish wall-mountable design with customizable artwork panels.
Not sure which air purifier is right for you?
Learn more about different types of air purifiers and how to choose the best one for your needs.
Read our complete buying guide →