Rancho Cucamonga, 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.
Rancho Cucamonga, CA air quality summary: Rancho Cucamonga, CA, holds a clean air score of 30.7 and a grade of F. The city reports a PM2.5 annual mean of 14.7, which is considered elevated for long-term exposure. Rancho Cucamonga records a PM2.5 annual mean of 14.7, indicating elevated long-term exposure for the population. The change in long-term air quality for Rancho Cucamonga has been limited or modest in recent years.
Clean Air Score
A clean air score of 30.7 indicates significant long-term air quality challenges in the region. The grade of F reflects consistent exposure to particulate matter levels that exceed established environmental benchmarks.
🏡 What This Means for Buying
Homebuyers should consider the elevated particulate levels as a significant factor in their long-term residency plans. It is advisable to integrate regional air quality data into a comprehensive evaluation of the local living environment.
Indoor Air Quality in Rancho Cucamonga, 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 Rancho Cucamonga.
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 Rancho Cucamonga:
- 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 Rancho Cucamonga Homes:
🩺 My Health Risk Assessment
See how Rancho Cucamonga's air quality affects you and your family specifically.
Health Advice
Reduce prolonged outdoor exertion.
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</> Create Free Widget🏡 Property Value Impact Analysis
Between 2019 and 2024, Rancho Cucamonga'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 Rancho Cucamonga earned a 30.7
Raw inputs, scoring weights, and data coverage for this city.
Best Time to Run
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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% | 0 |
| Unhealthy Days | 25% | 34.2 |
| 5-Year Trend | 20% | 50 |
| Seasonal Variability | 10% | 76.6 |
| Extreme Events | 5% | 90 |
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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Rancho Cucamonga Air Quality FAQs
Is Rancho Cucamonga a good fit for people who care about long-term air quality?
Rancho Cucamonga may present challenges for those prioritized on air quality, given its score of 30.7 and grade of F. The annual PM2.5 mean of 14.7 represents elevated long-term exposure.
What is the frequency of unhealthy air days in Rancho Cucamonga?
In Rancho Cucamonga, 3.3% of days are classified as having unhealthy air. This frequency supports the overall grade of F and indicates recurring exposure to higher pollution levels.
Is air quality in Rancho Cucamonga improving or getting worse over time?
Air quality trends in Rancho Cucamonga are currently stable, showing little significant movement in recent years.
Does air quality vary across different parts of Rancho Cucamonga?
Particulate concentrations can vary throughout Rancho Cucamonga based on proximity to major transit corridors and local industrial sources. General city data may not reflect specific street-level conditions.