Air quality · Hawaii
Air quality in Hawaii
Across the 4 Hawaii ZIPs with EPA county air-quality data, the median day is Good in all 4 (median AQI 21–32). No day in those counties reached Unhealthy in 2025. This is a 2025 county annual summary, not a live reading.
Last verified 2026-09-24 · methodology
Air quality by ZIP code in Hawaii
EPA's 2025 annual summary for each ZIP's county. Median AQI is the typical day; lower is cleaner.
| ZIP | Median AQI | Good days | Unhealthy or worse |
|---|---|---|---|
| 96813HonoluluHonolulu County | 29 Good | 355 of 365 | 0 |
| 96732KahuluiMaui County | 21 Good | 353 of 360 | 0 |
| 96720HiloHawaii County | 32 Good | 314 of 365 | 0 |
| 96766Lihue (Kauai)Kauai County | No data | ||
| 96793Wailuku (Maui)Maui County | 21 Good | 353 of 360 | 0 |
County-level figures from EPA Air Quality System (AQS), annual county summary, joined to each ZIP by county. None of them is a measurement at a specific address.
What lands here
Pages show the 2025 median AQI category (Good, Moderate, Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, Hazardous) for the ZIP's county, plus the year's max/90th-percentile AQI and day-count breakdown by category.
Source & refresh
EPA Air Quality System (AQS), annual county summary. Refreshed annual (epa aqs publication). Primary source →
Hawaii top concern
Tsunami, lava-zone, water-source isolation
Hawaii's federated data is unusual: FEMA tsunami evacuation zones are state-managed alongside NFHL flood maps; Big Island lava-flow zones (USGS) overlay FEMA hazard layers. Each island operates independent water utilities, so EPA SDWIS PWSIDs do not aggregate across the state.
See Hawaii state page for the full state-level rollup across all 12 dimensions.
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