Sunnyvale, CA
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.
Sunnyvale, CA air quality summary: Sunnyvale, CA reports a clean air score of 69.8 and a grade of C, with a PM2.5 annual mean of 8.3. These metrics provide a standard for evaluating the city's long-term atmospheric conditions. Sunnyvale recorded a PM2.5 annual mean of 8.3, which is characterized as a moderate level for long-term exposure. The long-term air quality trend in Sunnyvale is described as limited or modest.
Clean Air Score
A clean air score of 69.8 and a grade of C indicate that Sunnyvale has moderate particulate levels suitable for long-term exposure. These values reflect a typical residential environment in the region.
🏡 What This Means for Buying
Air quality should be viewed as one factor in a broader relocation or housing evaluation in Sunnyvale. Neutral assessment of particulate levels can help residents make informed long-term decisions.
Indoor Air Quality in Sunnyvale, CA
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 Sunnyvale.
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 Sunnyvale:
- Wildfire smoke infiltration (PM2.5)
- 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 Sunnyvale Homes:
🩺 My Health Risk Assessment
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Health Advice
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</> Create Free Widget🏡 Property Value Impact Analysis
Between 2019 and 2024, Sunnyvale's air quality worsened by 0.1 μg/m³. Based on NBER studies, this change correlates with a estimated 0.4% decrease in relative property value retention.
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Why Sunnyvale earned a 69.8
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% | 52.8 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 50 |
| Seasonal Variability | 10% | 87.3 |
| 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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Sunnyvale Air Quality FAQs
Is Sunnyvale a good fit for people who care about long-term air quality?
Sunnyvale offers a moderate environment with a clean air score of 69.8 and a grade of C. Its PM2.5 annual mean of 8.3 represents an acceptable level for long-term residential exposure.
How often does Sunnyvale experience unhealthy air or long-term pollution exposure?
Sunnyvale has an unhealthy air frequency of 0%, which is consistent with its C grade and PM2.5 annual mean of 8.3. This indicates that while average levels are moderate, extreme particulate spikes are uncommon.
Is the air quality in Sunnyvale improving or getting worse over time?
The air quality trend in Sunnyvale is currently neutral, suggesting that long-term particulate levels have remained relatively stable. With 99.7% data completeness, this trend reflects a reliable long-term record.
Are there neighborhood-level differences in air quality in Sunnyvale?
Air quality can vary within Sunnyvale due to local traffic, industry, and location patterns. Residents may find that particulate exposure differs based on proximity to major transit corridors or industrial areas.