Belknap, New Hampshire Air Quality
Belknap County, New Hampshire (NH)
→ Stableover 10 years
10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days).
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 35 | 54 | 105 | 310 | 54 | 1 | PM2.5 |
| 2022 | 32 | 46 | 68 | 339 | 19 | 0 | Ozone |
| 2021 | 31 | 47 | 110 | 340 | 24 | 1 | PM2.5 |
| 2020 | 32 | 45 | 65 | 342 | 17 | 0 | PM2.5 |
| 2019 | 32 | 48 | 77 | 292 | 24 | 0 | PM2.5 |
| 2018 | 33 | 49 | 80 | 257 | 26 | 0 | Ozone |
| 2017 | 34 | 54 | 84 | 261 | 47 | 0 | Ozone |
| 2016 | 35 | 51 | 84 | 230 | 27 | 0 | Ozone |
| 2015 | 33 | 46 | 90 | 201 | 12 | 0 | Ozone |
| 2014 | 32 | 46 | 90 | 201 | 12 | 0 | Ozone |
What This Means for Belknap County Residents
Belknap, New Hampshire has received an Air Quality Grade of B (70/100) based on a decade of monitoring data from the EPA's air quality monitoring program. The current median AQI of 35 falls in the "Good" range.
The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 0 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity. The American Lung Association's State of the Air report provides additional context on long-term health risks from air pollution exposure.
Frequently Asked Questions
Belknap, New Hampshire has a current median AQI of 35, which falls in the "Good" range. The area has received an Air Quality Grade of B (70/100) based on 10 years of EPA monitoring data.
Air quality in Belknap, New Hampshire is stable over the past decade. The median AQI has changed by +3 points from 2014 to 2023.
Belknap, New Hampshire averages 0 unhealthy air quality days per year over the past 5 years. On these days, sensitive groups including children, the elderly, and those with respiratory conditions should limit outdoor activity.
The primary pollutant affecting Belknap, New Hampshire is Ground-Level Ozone. This is the dominant contributor to elevated AQI readings in the Belknap County area.
Belknap, New Hampshire averages 0 unhealthy air days per year. This is relatively low, making it a reasonable choice for asthma sufferers. The primary pollutant is Ground-Level Ozone, which is a known asthma trigger.
With a median AQI of 35 (Good), outdoor exercise in Belknap, New Hampshire is generally safe year-round. Belknap, New Hampshire averages 0 days per year when athletes should move workouts indoors.