Hilo, HI
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.
Hilo, HI air quality summary: Hilo, HI maintains a Clean Air Score of 89.7 and an overall grade of A. This rating is based on a long-term PM2.5 annual mean of 2.7 micrograms per cubic meter. Hilo has a long-term PM2.5 annual mean of 2.7 micrograms per cubic meter. The long-term air quality trend in Hilo is described as improving over recent years.
Clean Air Score
A Clean Air Score of 89.7 indicates that Hilo has relatively low long-term particulate exposure conditions. The grade of A reflects the city's standing relative to long-term air quality standards.
🏡 What This Means for Buying
Air quality should be treated as one factor in a broader relocation or housing decision in Hilo. Prospective residents should evaluate these long-term pollution trends alongside other local factors.
Indoor Air Quality in Hilo, HI
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 Hilo.
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 Hilo:
- 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 Hilo Homes:
🩺 My Health Risk Assessment
See how Hilo's air quality affects you and your family specifically.
Health Advice
Enjoy the outdoors! Air quality is great.
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</> Create Free Widget🏡 Property Value Impact Analysis
Between 2019 and 2024, Hilo's air quality improved by 0.7 μg/m³. Based on NBER studies, this change correlates with a estimated 2.8% increase in relative property value retention.
Cleaner Alternatives in HI
No cleaner cities found in this state. Hilo is already a top performer!
🏆 Best Neighborhoods in Hilo
We analyzed air quality across multiple zip codes to find the healthiest spots to live. See which neighborhoods ranked #1.
Why Hilo earned a 89.7
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% | 100 |
| Unhealthy Days | 25% | 100 |
| 5-Year Trend | 20% | 53.5 |
| Seasonal Variability | 10% | 97.4 |
| 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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Hilo Air Quality FAQs
Is Hilo a good fit for people who care about long-term air quality?
Hilo has a Clean Air Score of 89.7 and a grade of A, suggesting a specific level of long-term exposure. The annual mean PM2.5 concentration is 2.7, which provides a baseline for evaluating the local environment.
What is the frequency of unhealthy air or long-term pollution exposure in Hilo?
In Hilo, the percentage of unhealthy air days is recorded at 0 percent. This contributes to the overall grade of A and the PM2.5 annual mean of 2.7.
Is air quality in Hilo improving or getting worse over time?
The air quality in Hilo is currently characterized as improving over recent years. Data completeness is 98.9 percent, which supports this evaluation.
Does air quality vary across different neighborhoods in Hilo?
Yes, air quality can vary significantly between different neighborhoods and ZIP codes in Hilo due to local factors. Readers should consult neighborhood-level details for more specific information.