Reston, VA
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.
Reston, VA air quality summary: Reston, VA currently holds a clean air score of 79.4 and a grade of B. The city's annual mean PM2.5 concentration is 6.8, representing moderate long-term exposure. Reston has an annual mean PM2.5 level of 6.8, which is described as moderate or acceptable for long-term exposure. The long-term air quality in Reston has been improving over recent years.
Clean Air Score
A score of 79.4 and a B grade indicate that Reston maintains a generally favorable air quality environment. These metrics suggest that particulate levels are consistently kept within acceptable limits.
🏡 What This Means for Buying
Air quality should be considered as one factor in a broader relocation or housing decision in Reston. The B grade serves as a neutral benchmark for understanding the city's environmental conditions.
Indoor Air Quality in Reston, VA
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 Reston.
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 Reston:
- 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 Reston Homes:
🩺 My Health Risk Assessment
See how Reston'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, Reston's air quality improved by 2.4 μg/m³. Based on NBER studies, this change correlates with a estimated 9.6% increase in relative property value retention.
Cleaner Alternatives in VA
Why Reston earned a 79.4
Raw inputs, scoring weights, and data coverage for this city.
Best Time to Run
Find the cleanest hours for your run today.
Cycling Forecast
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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% | 74.8 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 62 |
| Seasonal Variability | 10% | 94.5 |
| 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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Reston Air Quality FAQs
Is Reston a good fit for people who care about long-term air quality?
Reston is a solid option for those monitoring air quality, supported by a 79.4 score and B grade. The mean PM2.5 concentration of 6.8 is within a moderate and acceptable range for the region.
How frequent is unhealthy air or long-term pollution exposure in Reston?
Reston reports 0% unhealthy air days, which reinforces its B grade and suggests that significant pollution events are uncommon. This points to a stable long-term air quality environment.
Is air quality in Reston improving or getting worse over time?
The air quality trend in Reston is improving, meaning that particulate levels have generally trended lower in recent years. This is a positive indicator for the city's environment.
Does air quality vary within the city of Reston?
Air quality can vary within Reston due to local traffic, industry, and location patterns. Localized factors can create differences in air quality from one neighborhood to another.