Derry, NH
Long-term air quality
What this page tells you
This page combines annual PM2.5, unhealthy days, 5-year trend, and data coverage so you can compare long-term air quality, not just today's reading.
Derry, NH air quality summary: Derry, NH, enjoys an excellent clean air score of 87.4 and a grade of A, indicating superior long-term air quality. The city's annual PM2.5 mean is 5.3 µg/m³, which is very low and favorable for residents. In Derry, the annual PM2.5 mean is 5.3 µg/m³, representing a relatively low level of long-term particulate exposure. The long-term air quality in Derry has shown limited change over recent years.
Clean Air Score
A grade of A and a score of 87.4 signify that Derry maintains high standards for air clarity over time. These ratings reflect a consistent environment with minimal pollution impact on the community.
🏡 What This Means for Buying
Prospective residents should consider the A grade as a major environmental advantage of living in Derry. The air quality is exceptionally clean and remains a stable benefit for long-term health and well-being.
Indoor Air Quality in Derry, NH
Outdoor pollution can still affect indoor air when windows are open, filtration is weak, or wildfire smoke moves in.
How to react when today's AQI changes
Use the AQI bands below to decide whether to open windows, run an air purifier, or stay indoors when pollution spikes in Derry.
AQI 0-50
GoodOpen windows: Open windows if you want fresh air.
Air purifier: No purifier needed for most homes.
Indoor activity: Normal indoor activity is fine.
AQI 51-100
ModerateOpen windows: Sensitive groups should limit open-window time.
Air purifier: Use fans or filtration if dust or pollen is bothering you.
Indoor activity: Most people can stay active indoors.
AQI 101-150
Unhealthy for Sensitive GroupsOpen windows: Keep windows closed.
Air purifier: Run a HEPA purifier in the main room and bedroom.
Indoor activity: Sensitive groups should reduce outdoor exposure.
AQI 151+
UnhealthyOpen windows: Keep windows and doors closed.
Air purifier: Run HEPA continuously and seal obvious drafts.
Indoor activity: Stay indoors as much as possible; use an N95 if you must go out.
Common indoor air concerns in Derry:
- Seasonal pollen and dust mite allergens
- VOCs from household products
Recommended action: If today's AQI reaches 101 or higher, close windows and run HEPA filtration before indoor air starts to feel smoky or stale.
Top Products for Derry Homes:
🩺 My Health Risk Assessment
See how Derry's air quality affects you and your family specifically.
Health Advice
Enjoy the outdoors! Air quality is great.
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</> Create Free Widget🏡 Property Value Impact Analysis
Between 2019 and 2024, Derry's air quality improved by 0.1 μg/m³. Based on NBER studies, this change correlates with a estimated 0.4% increase in relative property value retention.
Cleaner Alternatives in NH
No cleaner cities found in this state. Derry is already a top performer!
Why Derry earned a 87.4
Raw inputs, scoring weights, and data coverage for this city.
Best Time to Run
Find the cleanest hours for your run today.
Cycling Forecast
Avoid pollution spikes on your next ride.
📅 Past 30 Days Trend
Real-time daily PM2.5 AQI
🌸 Pollen Outlook
Current Seasonal Forecast
How it worksBased on current seasonal forecast data. Not a long-term pollution rating or relocation score.
Score Breakdown
| Component | Weight | Score Contribution |
|---|---|---|
| Annual Air Quality | 40% | 95.7 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 50 |
| Seasonal Variability | 10% | 91.3 |
| Extreme Events | 5% | 100 |
Explore More Air Quality Data
Frequently Asked Questions
About This Data
Data Sources
Historical air quality mapping and scoring are based completely on official U.S. Environmental Protection Agency (EPA) AirNow API data. 5-day AQI forecasts are provided by WAQI.
Methodology
Our Clean Air Score (0-100) is a proprietary algorithm that weighs multiple factors:
- Annual PM2.5 averages (40%)
- Frequency of unhealthy days (25%)
- 5-year pollution trends (20%)
- Seasonal variability and extreme events (15%)
Updates & Accuracy
Real-time data is updated hourly. Historical aggregate scores are recalculated monthly to reflect the latest trends. While we strive for accuracy, sensor maintenance and local conditions can affect individual readings.
Practical Advice
When AQI > 100: Sensitive groups (children, elderly, asthmatics) should limit prolonged outdoor exertion.
When AQI > 150: Everyone should avoid outdoor exercise and keep windows closed.
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Derry Air Quality FAQs
Is Derry a good fit for people who care about long-term air quality?
Derry is an outstanding choice for those who value air quality, with its clean air score of 87.4 and grade of A. The annual PM2.5 mean of 5.3 µg/m³ indicates a very clean long-term atmosphere.
What is the frequency of unhealthy air or long-term pollution exposure in Derry?
Derry has an unhealthy days percentage of 0, which is perfect and consistent with its A grade. This means residents are almost never exposed to unhealthy levels of pollution.
Is air quality in Derry improving or getting worse over time?
The air quality trend in Derry is currently stable, with no significant changes observed in pollution levels over recent years.
Does air quality vary across different parts of Derry?
Air quality can vary within Derry due to local traffic, industry, and location patterns, although the overall city grade remains exceptionally high.