Air quality in Hawaii
EPA monitors report from 4 of Hawaii’s 5 counties. That is the honest limit of this page: the other 1 are not measured, not clean.
4
Counties with monitors
1
Counties without
0
Days above moderate, 2025
Summed across monitored counties
9.8%
Adults with asthma
Population-weighted county estimate
County by county
Monitored Hawaii counties
GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
| County | 90th %ile AQI | Above moderate | Max AQI | 2025 days by category |
|---|---|---|---|---|
| Hawaii County | 53 | 0 | 93 | |
| Honolulu County | 39 | 0 | 59 | |
| Kauai County | 26 | 0 | 38 | |
| Maui County | 32 | 0 | 69 |
EPA Air Quality System annual summaries by county, 2025. The 90th percentile AQI describes a day worse than nine out of ten, which is a steadier measure than the annual maximum a single wildfire can set.
Not measured
1 counties without a monitor
No EPA monitor reported from these counties, so there is no air quality record to publish. Their radon zone is known, and radon is measured in the building rather than the air outside it.
Other states
Air quality elsewhere
- Alabama
- Alaska
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