Defiance, OH
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.
Defiance, OH air quality summary: Defiance, OH, maintains a clean air score of 83.8 and a grade of B, indicating a very healthy long-term atmosphere for its residents. The city records an annual PM2.5 mean of 5.9 µg/m³, reflecting low levels of particulate exposure. In Defiance, the annual PM2.5 mean is 5.9 µg/m³, representing a relatively low level of long-term particulate exposure. The long-term air quality in Defiance has been improving over recent years.
Clean Air Score
A grade of B and a score of 83.8 suggest that Defiance experiences high standards of air quality over time. These ratings reflect a consistent environment with minimal pollution impact on the community.
🏡 What This Means for Buying
The B grade for Defiance is an encouraging sign for potential residents. Air quality is a stable and reliable factor that contributes to the overall desirability of the area for long-term health.
Indoor Air Quality in Defiance, OH
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 Defiance.
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 Defiance:
- 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 Defiance Homes:
🩺 My Health Risk Assessment
See how Defiance'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, Defiance's air quality improved by 1.2 μg/m³. Based on NBER studies, this change correlates with a estimated 4.8% increase in relative property value retention.
Cleaner Alternatives in OH
Why Defiance earned a 83.8
Raw inputs, scoring weights, and data coverage for this city.
Best Time to Run
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Cycling Forecast
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📅 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% | 86.5 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 56 |
| Seasonal Variability | 10% | 91.8 |
| 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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Defiance Air Quality FAQs
Is Defiance a good fit for people who care about long-term air quality?
Defiance is an excellent choice for those prioritizing air quality, with its clean air score of 83.8 and grade of B. The annual PM2.5 mean of 5.9 µg/m³ indicates a very clean long-term atmosphere.
What is the frequency of unhealthy air or long-term pollution exposure in Defiance?
Defiance reports an unhealthy days percentage of 0, which is an excellent result for its grade. This means that residents are almost never exposed to high levels of pollution.
Is air quality in Defiance improving or getting worse over time?
The air quality trend in Defiance is currently improving, providing further confidence for the city's future environmental health.
Does air quality vary across different parts of Defiance?
Air quality can vary within Defiance due to local traffic, industry, and location patterns, although the city-wide grade remains a strong general indicator.