Metro area air quality · 2025
Kahului-Wailuku-Lahaina, HI
Median AQI 21 (Good). 98.1% of monitored days rated Good across this metro's EPA monitoring network.
- 21
- Median AQI
- 98.1%
- Good-air days
- 0
- Unhealthy days
- 98%
- Cleaner than US metros
Kahului-Wailuku-Lahaina, HI posted a 2025 median AQI of 21 (Good) with 98.1% Good days
According to the U.S. EPA Air Quality System, the Kahului-Wailuku-Lahaina, HI CBSA recorded a median AQI of 21 across 360 monitored days in 2025, with 98.1% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US metros
- The Kahului-Wailuku-Lahaina, HI CBSA's 98.1% Good-day share places it cleaner than 98% of US metros in 2025.
- Closest median-AQI peer
- Othello, WA (90.5% Good, median AQI 21) is the closest nationwide median-AQI peer to Kahului-Wailuku-Lahaina, HI.
- 2020–2025 Good-day shift
- Kahului-Wailuku-Lahaina, HI's Good-day share moved -0.2 points from 2020 to 2025 (median AQI +0).
- Median AQI
- Median AQI: 21
Aggregated from EPA Air Quality System (2025), 360 monitored days. EPA AQS →
The verdict
The Kahului-Wailuku-Lahaina, HI metro runs good on the EPA scale, among the cleanest 10% of US metros, a median AQI of 21 with 98.1% of 360 monitored days in the Good band.
- 21
- median AQI · Good
- 98.1%
- days rated Good
- 98%
- cleaner than US metros
- 69
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Annual release change
What changed in the 2025 EPA annual release
- Kahului-Wailuku-Lahaina, HI metro's peak single-day AQI fell from 101 to 69 between the 2024 and 2025 EPA annual releases, a change of -32 points.
- Kahului-Wailuku-Lahaina, HI metro's Good-day share fell from 100.0% to 98.1% between the 2024 and 2025 EPA annual releases, a change of -1.9 percentage points.
Insights: Kahului-Wailuku-Lahaina, HI metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 21 over 360 measured days in 2025, which corresponds to a Good band and a Excellent metro-wide health grade. The monitored-day split lands at 353 Good days (98%), 7 Moderate (2%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 32 while the highest single-day reading hit 69 (Moderate). Metro residents averaged roughly 29.4 clean-air days per 30-day window across the reporting year.
Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -0.2 points and the median AQI moved +0 points, which classifies the multi-year trajectory as stable. The metro recorded no Unhealthy-tier days in this annual dataset. Metros with comparable AQI profiles include Othello, WA (90.5% good, AQI 21); Palatka, FL (95.6% good, AQI 21); Aberdeen, WA (97.3% good, AQI 22).
Air Quality Summary
Median AQI
21
Good
Good Days
98.1%
353 of 360 days
Max AQI
69
Moderate
Health Grade
Excellent
90th pct: 32
AQI Day Breakdown (2025)
Distribution of 360 monitored days across EPA AQI categories.
Good
353
98%
Moderate
7
2%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Kahului-Wailuku-Lahaina, HI metro area's air quality is rated Excellent based on 98.1% good air days. No unhealthy air days were recorded in 2025.
Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.
How does the Kahului-Wailuku-Lahaina, HI metro compare?
How Kahului-Wailuku-Lahaina, HI compares
5-Year Air Quality Trend
Air quality is stable in the Kahului-Wailuku-Lahaina, HI metro. Highest Good-day share: 2024 (100.0%, 363 of 363 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 343 | 6 | 0 | 21 | 61 |
| 2021 | 361 | 2 | 0 | 21 | 63 |
| 2022 | 357 | 4 | 0 | 21 | 58 |
| 2023 | 344 | 2 | 1 | 20 | 152 |
| 2024 | 363 | 0 | 0 | 21 | 101 |
| 2025 | 353 | 7 | 0 | 21 | 69 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Kahului-Wailuku-Lahaina, HI (21).
Othello, WA
Median AQI 21 · 90.5% Good-day share
Palatka, FL
Median AQI 21 · 95.6% Good-day share
Aberdeen, WA
Median AQI 22 · 97.3% Good-day share
Bremerton-Silverdale, WA
Median AQI 22 · 95.5% Good-day share
Centralia, WA
Median AQI 20 · 91.3% Good-day share
Gardnerville Ranchos, NV
Median AQI 22 · 91.1% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Kahului-Wailuku-Lahaina, HI's 0 (independent of median AQI).
Aberdeen, SD
0 unhealthy-or-worse days · median AQI 27
Adrian, MI
0 unhealthy-or-worse days · median AQI 41
Akron, OH
0 unhealthy-or-worse days · median AQI 45
Albany, GA
0 unhealthy-or-worse days · median AQI 46
Albany, OR
0 unhealthy-or-worse days · median AQI 27
Albany-Schenectady-Troy, NY
0 unhealthy-or-worse days · median AQI 41
More Air Quality Data
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Worst Air Quality
Counties and metros with the most unhealthy air days.
All Metro Areas
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Best and Worst City Air
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Air Quality Guides
Frequently Asked Questions
What is the air quality in the Kahului-Wailuku-Lahaina, HI metro area? ▼
How many unhealthy air days does Kahului-Wailuku-Lahaina, HI have? ▼
Is air quality in Kahului-Wailuku-Lahaina, HI getting better or worse? ▼
What does AQI 21 mean for health? ▼
What is the 90th percentile AQI for Kahului-Wailuku-Lahaina, HI? ▼
How does Kahului-Wailuku-Lahaina, HI compare to other metro areas? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. See our methodology for how AQI, median, and coverage figures are computed.
Read our methodology , how this data is sourced, computed, and verified.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary files (metro-level) · 2020–2025
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Every figure on PlainAirData is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.