San Lorenzo, 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.
San Lorenzo, CA air quality summary: San Lorenzo, CA, holds a Clean Air Score of 79 and a grade of B for its atmospheric conditions. The city recorded an annual PM2.5 mean of 6.7, reflecting average particulate levels for long-term exposure. San Lorenzo maintains an annual PM2.5 mean of 6.7, representing moderate or acceptable long-term particulate exposure. The change in long-term air quality in San Lorenzo has been limited or modest in recent years.
Clean Air Score
The Clean Air Score of 79 and B grade signify that San Lorenzo experiences good air quality over the long term. These metrics indicate that particulate levels are typically managed within healthy parameters.
🏡 What This Means for Buying
San Lorenzo's favorable air quality is a positive element for those considering the area for long-term residence. Factual environmental data offers a neutral context for relocation or housing evaluations.
Indoor Air Quality in San Lorenzo, 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 San Lorenzo.
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 San Lorenzo:
- 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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🩺 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, San Lorenzo's air quality improved by 0.5 μg/m³. Based on NBER studies, this change correlates with a estimated 2% increase in relative property value retention.
Cleaner Alternatives in CA
Why San Lorenzo earned a 79
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% | 75.2 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 50 |
| Seasonal Variability | 10% | 89.8 |
| 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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San Lorenzo Air Quality FAQs
Is San Lorenzo a good fit for people who care about long-term air quality?
With a Clean Air Score of 79 and a B grade, San Lorenzo is a solid choice for those who prioritize clean air. The annual PM2.5 mean of 6.7 indicates a consistently clear atmospheric profile.
What is the frequency of unhealthy air or long-term pollution exposure in San Lorenzo?
San Lorenzo reports 0% unhealthy air days, reinforcing its B grade for long-term exposure. This lack of significant spikes is consistent with the annual PM2.5 mean of 6.7.
Is air quality in San Lorenzo improving or getting worse over time?
The long-term air quality in San Lorenzo has shown limited or modest changes recently. This stability suggests a consistent environmental profile for the community over the observed period.
How does air quality vary within the city?
Air quality can vary within the city due to local traffic, industry, and location patterns, without naming specific districts. Residents may find that particulate levels differ based on proximity to localized environmental influences.