🌿 CleanAirData
← Back to all cities

Kahului, HI

🌍
Looking for air quality outside the US? We currently only cover US cities. For international data, please check your local environmental agency website.

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.

Jump to indoor air guidance Read the formula
📍 Homebuyer Guide 📊 Data Coverage: 97.8% 📅 2021-2025 Trends

Kahului, HI air quality summary: Kahului, HI features a clean air score of 88.3 and a grade of A, with an annual PM2.5 mean of 4 µg/m³. These metrics indicate exceptionally clean long-term air quality for the area. Kahului recorded an annual PM2.5 mean of 4 µg/m³, which is considered relatively low long-term particulate exposure. Long-term air quality in Kahului has been worsening over recent years.

Clean Air Score

88
Grade A

The clean air score of 88.3 and grade of A reflect air quality that is among the best in the nation. This suggests minimal long-term particulate exposure for residents of Kahului.

🏡 What This Means for Buying

Kahului's superior air quality is a significant benefit for those considering a long-term move. This environmental factor should be weighed alongside other unique island lifestyle considerations.

Best time for outdoor visits: Check seasonal chart

Indoor Air Quality in Kahului, 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 Kahului.

AQI 0-50

Good

Open 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

Moderate

Open 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 Groups

Open 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+

Unhealthy

Open 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 Kahului:

  • 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 Kahului Homes:

Best HEPA Air Purifier for Kahului Wildfire Smoke PM2.5 Indoor Air Quality Monitor Formaldehyde & VOC Detector
People also search: "indoor air quality in Kahului, HI"

🩺 My Health Risk Assessment

See how Kahului's air quality affects you and your family specifically.

Current Risk Level
Low Risk
🟢
💡

Health Advice

Enjoy the outdoors! Air quality is great.

Est. Annual "Risky Days" for you: ~1 days/year

Add Kahului Air Quality to your site

Perfect for local news, real estate blogs, and community pages.

</> Create Free Widget

🏡 Property Value Impact Analysis

Estimated Impact (5-Year)
Concern Signal
-2.4% theoretical value retention

Between 2019 and 2024, Kahului's air quality worsened by 0.6 μg/m³. Based on NBER studies, this change correlates with a estimated 2.4% decrease in relative property value retention.

* Methodology: Comparison based on National Bureau of Economic Research (NBER) Working Paper 15655 correlation between PM2.5 reduction and housing prices. This is a theoretical estimate for informational purposes only.
Sponsor

🏆 Best Neighborhoods in Kahului

We analyzed air quality across multiple zip codes to find the healthiest spots to live. See which neighborhoods ranked #1.

View Rankings →
Annual PM2.5
4 μg/m³
WHO Target: <5.0
Good Days
99.7 %
% days AQI < 100
5-Year Trend
Worsening
↓ Worsening
Long-term direction
Extreme Days
0 days/yr
Days AQI > 150 (Est.)

Why Kahului earned a 88.3

Raw inputs, scoring weights, and data coverage for this city.

See full formula
Annual Air Quality
4 μg/m³
Component score 100 × 40% = 40.0 points
Unhealthy Days
1 days/yr est.
0.3% of days above AQI 100. Component score 94.4 × 25% = 23.6 points
5-Year Trend
Worsening
Component score 47 × 20% = 9.4 points
Seasonal Variability
96.8
Higher means steadier month-to-month air. Weighted contribution: 9.7 points
Extreme Events
100
Captures severe pollution spikes. Weighted contribution: 5.0 points
Coverage & Monitoring
97.8%
Direct EPA city monitor
🏃

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

Live Data

Score Breakdown

Component Weight Score Contribution
Annual Air Quality 40% 100
Unhealthy Days 25% 94.4
5-Year Trend 20% 47
Seasonal Variability 10% 96.8
Extreme Events 5% 100

Explore More Air Quality Data

View more cities in HI See how Kahului compares nationally

Frequently Asked Questions

How often is this air quality data updated? Our historical trend models and annual rankings are updated regularly based on official EPA data to ensure reports reflect the latest available long-term trends.
What sources does CleanAirData use? We rely strictly on official U.S. Environmental Protection Agency (EPA) monitoring station data for all historical air quality scoring and reports.
Data sourced from U.S. Environmental Protection Agency (EPA) — See our methodology

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.

Data provided for informational purposes only. Always consult local health officials during extreme smoke or pollution events.

More Cities in HI

Hilo Grade A
Score: 89.7/100
Honolulu Grade A
Score: 89.6/100
Pearl City Grade A
Score: 89.6/100
Waipahu Grade A
Score: 89.6/100
Mililani Town Grade A
Score: 89.6/100
‘Ewa Gentry Grade A
Score: 89.6/100

Similar Rankings Nationwide

#158 Swansea, MA
Score: 88.6/100
#159 Fairhaven, MA
Score: 88.6/100
#160 Anchorage, AK
Score: 88.3/100
#161 Eugene, OR
Score: 88.3/100
#162 Eagle River, AK
Score: 88.3/100
#163 Kīhei, HI
Score: 88.3/100

Kahului Air Quality FAQs

Is Kahului a good fit for people who care about long-term air quality?

Kahului is an excellent fit for air-quality conscious individuals, boasting a score of 88.3 and a grade of A. The annual PM2.5 mean of 4 µg/m³ is extremely low by national standards.

How frequent is unhealthy air in Kahului?

Unhealthy air days in Kahului occur about 0.3% of the time, though the city maintains a grade of A. This reflects very rare pollution events in an otherwise very clean annual mean of 4 µg/m³.

Is air quality in Kahului improving or getting worse over time?

Air quality in Kahului has been worsening over recent years, though it remains at a very high overall level.

Does air quality vary across different parts of Kahului?

Air quality can vary by neighborhood or ZIP code due to local factors like traffic and proximity to industry.