Menlo Park, 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.
Menlo Park, CA air quality summary: Menlo Park, CA maintains a Clean Air Score of 69.8 and an air quality grade of C. The city's long-term particulate levels are measured by an annual PM2.5 mean of 8.3 µg/m³. At 8.3 µg/m³ annually, Menlo Park is characterized by moderate or acceptable but still relevant for long-term exposure. Long-term air quality in Menlo Park has been limited or modest.
Clean Air Score
A grade of C indicates that Menlo Park experiences variable long-term air quality conditions. The 69.8 score reflects historical data patterns regarding particulate exposure over time.
🏡 What This Means for Buying
Prospective residents in Menlo Park should evaluate air quality as one factor in their long-term housing or relocation decisions. Guidance suggests using this historical C grade to understand the city's general atmospheric profile.
Indoor Air Quality in Menlo Park, 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 Menlo Park.
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 Menlo Park:
- 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.
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</> Create Free Widget🏡 Property Value Impact Analysis
Between 2019 and 2024, Menlo Park'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 Menlo Park 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
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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% | 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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Menlo Park Air Quality FAQs
Is Menlo Park a good fit for people who care about long-term air quality?
Menlo Park, CA currently holds a Clean Air Score of 69.8 and a grade of C. With an annual PM2.5 mean of 8.3 µg/m³, it offers a moderate profile for long-term environmental considerations.
How often does Menlo Park experience unhealthy air frequency or long-term pollution exposure?
Menlo Park has an unhealthy-air frequency of 0%, which aligns with its C grade. This indicates that long-term particulate exposure is generally governed by the annual mean of 8.3 µg/m³.
Is the air quality in Menlo Park improving or getting worse over time?
Monitoring of Menlo Park's atmosphere indicates that long-term air quality has been limited or modest over the historical period.
Does air quality vary within different parts of Menlo Park?
Air quality can vary within Menlo Park due to local traffic, industry, and location patterns, even without a formal neighborhood structure.