La Cañada Flintridge, 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.
La Cañada Flintridge, CA air quality summary: La Cañada Flintridge, CA, received a Clean Air Score of 39.6 and an F grade based on long-term environmental assessments. The city recorded an annual PM2.5 mean of 13, which measures the average particulate matter exposure over time. La Cañada Flintridge maintains an annual PM2.5 mean of 13, which is described as elevated for long-term exposure. Air quality in the region has been worsening over recent years based on historical observations.
Clean Air Score
A Clean Air Score of 39.6 and an F grade indicate that La Cañada Flintridge faces significant challenges with long-term air quality. These ratings suggest that particulate concentrations are frequently higher than recommended levels.
🏡 What This Means for Buying
When evaluating the area for housing or relocation, air quality should be considered as a factor in the overall assessment. Factual environmental data provides context for understanding the long-term living environment.
Indoor Air Quality in La Cañada Flintridge, 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 La Cañada Flintridge.
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 La Cañada Flintridge:
- 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 La Cañada Flintridge Homes:
🩺 My Health Risk Assessment
See how La Cañada Flintridge's air quality affects you and your family specifically.
Health Advice
Reduce prolonged outdoor exertion.
Add La Cañada Flintridge Air Quality to your site
Perfect for local news, real estate blogs, and community pages.
</> Create Free Widget🏡 Property Value Impact Analysis
Between 2019 and 2024, La Cañada Flintridge's air quality worsened by 2.3 μg/m³. Based on NBER studies, this change correlates with a estimated 9.2% decrease in relative property value retention.
Cleaner Alternatives in CA
Why La Cañada Flintridge earned a 39.6
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% | 0 |
| Unhealthy Days | 25% | 67.2 |
| 5-Year Trend | 20% | 38.5 |
| Seasonal Variability | 10% | 80.8 |
| Extreme Events | 5% | 95 |
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.
More Cities in CA
Similar Rankings Nationwide
La Cañada Flintridge Air Quality FAQs
Is La Cañada Flintridge a good fit for people who care about long-term air quality?
The city's Clean Air Score of 39.6 and F grade reflect elevated particulate levels that may concern those prioritizing air quality. The annual PM2.5 mean of 13 indicates a persistent presence of airborne particulates.
What is the frequency of unhealthy air or long-term pollution exposure in La Cañada Flintridge?
In La Cañada Flintridge, 1.6% of days are classified as having unhealthy air, which contributes to the city's F grade. This frequency of exposure is reflected in the elevated annual PM2.5 mean of 13.
Is air quality in La Cañada Flintridge improving or getting worse over time?
The long-term air quality in La Cañada Flintridge has shown a worsening trend over recent years. This direction suggests a gradual increase in particulate concentrations according to available monitoring data.
How does air quality vary within the city?
Air quality can vary within the city due to local traffic, industry, and location patterns. Particulate levels may be different depending on proximity to localized pollution sources within the community.