Honolulu Air Quality in 2023
In 2023, Honolulu's air quality (Urban Honolulu, HI area) had a median daily AQI of 31 (Good) across 365 monitored days. 1 day (0.3%) reached Unhealthy for Sensitive Groups or worse, 337 were Good, and the year's peak AQI was 117 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 187 of those days. The cleanest month of 2023 was October (median AQI 24, 0 days above 100) and the worst was January (median 37, 1 day above 100, peak 117).
- Good: 92.3%
- Moderate: 7.4%
- Unhealthy for Sensitive Groups: 0.3%
- Unhealthy or worse: 0.0%
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How was Honolulu's air quality in 2023?
Good on a typical day: median AQI 31, with 1 day above AQI 100 out of 365 monitored — the 7th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2023: 117 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 187 days.
- ✓Cleanest month: October; worst: January.
Frequently asked questions
What was the average AQI in Honolulu in 2023?▾
EPA's Air Quality System puts Honolulu's (Urban Honolulu, HI) median daily AQI for 2023 at 31, which is Good. 1 day were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 117.
Which month had the worst air quality in Honolulu in 2023?▾
The cleanest month of 2023 was October (median AQI 24, 0 days above 100) and the worst was January (median 37, 1 day above 100, peak 117).
Was 2023 a good or bad year for Honolulu's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 7th cleanest by days above AQI 100 — the worst year on record here. 2023's median of 31 is in line with the area's typical annual median of 29.
Honolulu month by month in 2023
Honolulu air quality month by month, 2023 (Urban Honolulu, HI, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| Januaryworst | 31 | 37 | 1 | 117 | PM2.5 |
| February | 28 | 39 | 0 | 55 | PM2.5 |
| March | 31 | 37 | 0 | 55 | PM2.5 |
| April | 30 | 32 | 0 | 48 | PM2.5 |
| May | 31 | 36 | 0 | 53 | PM2.5 |
| June | 30 | 26 | 0 | 37 | O3 |
| July | 31 | 29 | 0 | 53 | PM2.5 |
| August | 31 | 31 | 0 | 73 | PM2.5 |
| September | 30 | 26 | 0 | 49 | PM2.5 |
| Octobercleanest | 31 | 24 | 0 | 55 | O3 |
| November | 30 | 32 | 0 | 52 | O3 |
| December | 31 | 32 | 0 | 64 | O3 |
How 2023 compares
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 7th cleanest by days above AQI 100 — the worst year on record here.
2023's median of 31 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 21 (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.