Honolulu, Hawaii Air Quality
Honolulu County, Hawaii (HI)
↓ Improvingover 10 years
10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days). This area has seen measurable air quality improvement over the decade.
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 31 | 47 | 117 | 337 | 27 | 1 | PM2.5 |
| 2022 | 29 | 40 | 57 | 356 | 9 | 0 | PM2.5 |
| 2021 | 28 | 39 | 58 | 364 | 1 | 0 | Ozone |
| 2020 | 28 | 38 | 63 | 363 | 3 | 0 | Ozone |
| 2019 | 28 | 41 | 62 | 360 | 5 | 0 | Ozone |
| 2018 | 31 | 43 | 73 | 353 | 12 | 0 | Ozone |
| 2017 | 32 | 46 | 68 | 340 | 25 | 0 | Ozone |
| 2016 | 32 | 49 | 64 | 330 | 36 | 0 | Ozone |
| 2015 | 39 | 56 | 66 | 283 | 82 | 0 | PM2.5 |
| 2014 | 32 | 49 | 195 | 325 | 33 | 1 | PM2.5 |
What This Means for Honolulu County Residents
Honolulu, Hawaii has received an Air Quality Grade of B (76/100) based on a decade of EPA monitoring data. The current median AQI of 31 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 1 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 0 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.