Honolulu Air Quality in July
Across 2019–2025, Honolulu's July air quality had a median AQI of 23 (Good) over 217 monitored days in the Urban Honolulu, HI area. 0.0% of July days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 53.9% of days. The cleanest July on record here was 2020 (median AQI 20, 0 days above 100) and the worst was 2023 (median 29, 0 days above 100, peak AQI 53).
- Good: 98.6%
- Moderate: 1.4%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Honolulu in July?
Good on a typical day: median AQI 23 across 2019–2025, with 0.0% of July days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓98.6% of July days were Good (AQI 0–50), 1.4% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the July peak was 58.
- ✓Best July: 2020; worst July: 2023.
Frequently asked questions
What is the air quality like in Honolulu in July?▾
Across 2019–2025, the median daily AQI in Honolulu in July was 23 (Good). 98.6% of days were Good, 1.4% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is July a good time for outdoor exercise in Honolulu?▾
A typical July day in Honolulu sits in the Good range (median AQI 23), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of July days reached AQI 101+ in 2019–2025.
Which pollutant causes Honolulu's July air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 53.9% of July days in Honolulu. The highest July AQI recorded in 2019–2025 was 58 (Moderate), in 2023.
Honolulu July air quality, year by year
Honolulu July air quality by year (Urban Honolulu, HI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 22 | 0 | 34 | PM2.5 |
| 2020cleanest | 31 | 20 | 0 | 36 | PM2.5 |
| 2021 | 31 | 22 | 0 | 58 | O3 |
| 2022 | 31 | 24 | 0 | 31 | PM2.5 |
| 2023worst | 31 | 29 | 0 | 53 | PM2.5 |
| 2024 | 31 | 27 | 0 | 35 | O3 |
| 2025 | 31 | 22 | 0 | 34 | PM2.5 |
What July air means in Honolulu
A typical July day in Honolulu sits in the Good range (median AQI 23), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of July days reached AQI 101+ in 2019–2025.
July's median AQI of 23 is below Honolulu's whole-year median of 29, making it one of the area's cleaner periods. Nationally, the median July AQI across every EPA metro area (103,858 metro-days, 2019–2025) is 47, so Honolulu runs below the national July norm; 0.0% of its July days topped AQI 100 versus 3.6% nationally (below average).
July is part of Honolulu's summer season (June, July, August); the summer page pools all three months.
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 month 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.