Honolulu Air Quality in 2025
In 2025, Honolulu's air quality (Urban Honolulu, HI area) had a median daily AQI of 29 (Good) across 365 monitored days. 0 days (0.0%) reached Unhealthy for Sensitive Groups or worse, 355 were Good, and the year's peak AQI was 59 (Moderate). Ground-level ozone set the daily AQI on 226 of those days. The cleanest month of 2025 was July (median AQI 22, 0 days above 100) and the worst was January (median 38, 0 days above 100, peak 55).
- Good: 97.3%
- Moderate: 2.7%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How was Honolulu's air quality in 2025?
Good on a typical day: median AQI 29, with 0 days above AQI 100 out of 365 monitored — the 5th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 59 (Moderate).
- ✓Ground-level ozone was the main pollutant on 226 days.
- ✓Cleanest month: July; worst: January.
Frequently asked questions
What was the average AQI in Honolulu in 2025?▾
EPA's Air Quality System puts Honolulu's (Urban Honolulu, HI) median daily AQI for 2025 at 29, which is Good. 0 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 59.
Which month had the worst air quality in Honolulu in 2025?▾
The cleanest month of 2025 was July (median AQI 22, 0 days above 100) and the worst was January (median 38, 0 days above 100, peak 55).
Was 2025 a good or bad year for Honolulu's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 5th cleanest by days above AQI 100. 2025's median of 29 is in line with the area's typical annual median of 29.
Honolulu month by month in 2025
Honolulu air quality month by month, 2025 (Urban Honolulu, HI, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| Januaryworst | 31 | 38 | 0 | 55 | O3 |
| February | 28 | 34 | 0 | 56 | O3 |
| March | 31 | 36 | 0 | 58 | O3 |
| April | 30 | 31 | 0 | 59 | O3 |
| May | 31 | 29 | 0 | 36 | O3 |
| June | 30 | 25 | 0 | 38 | O3 |
| Julycleanest | 31 | 22 | 0 | 34 | PM2.5 |
| August | 31 | 22 | 0 | 30 | PM2.5 |
| September | 30 | 22 | 0 | 33 | O3 |
| October | 31 | 25 | 0 | 35 | O3 |
| November | 30 | 31 | 0 | 51 | O3 |
| December | 31 | 31 | 0 | 46 | O3 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 5th cleanest by days above AQI 100.
2025's median of 29 is in line with the area's typical annual median of 29.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Honolulu
The latest EPA AirNow observation puts Honolulu's AQI at 15 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Honolulu air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Urban Honolulu, HI), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.