Worst air pollution Honolulu, today and tomorrow
Today (9 August): Air quality in Honolulu is poor. AQI and PM10 are poor; O3 is fair; PM2.5 is medium; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (PM10: 61.8/100).
Tomorrow (10 August 2026): Air quality in Honolulu is poor. All pollutants stay as today. Pollution peaks around 12:00 AM (PM10: 66.2/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Honolulu's air quality is excellent, benefiting from the powerful northeast trade winds that provide consistent clean Pacific Ocean ventilation across the Hawaiian Islands throughout most of the year. The primary concerns are volcanic emissions from Kilauea on the Big Island, known locally as vog, which can reach Oahu under southerly Kona wind conditions, and vehicle emissions from H-1 Freeway traffic through the enclosed Honolulu basin.
Today - 9 August | Pollution peaks at 23:00
AQI:
Poor
61.8/100
PM2.5 (fine particles):
Medium
45.2/100
PM10 (coarse particles):
Poor
61.8/100
NO2 (nitrogen dioxide):
Good
0.2/100
O3 (ozone):
Fair
20.0/100
SO2 (sulfur dioxide):
Good
1.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
7.6/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 00:00
AQI:
Poor
66.2/100
PM2.5 (fine particles):
Medium
44.4/100
PM10 (coarse particles):
Poor
66.2/100
NO2 (nitrogen dioxide):
Good
0.1/100
O3 (ozone):
Fair
21.4/100
SO2 (sulfur dioxide):
Good
1.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
6.8/100
Air quality forecasts for neighbourhoods and landmarks in Honolulu
Frequently Asked Questions
Is air quality bad in Honolulu right now?
On 9 August 2026, overall air quality in Honolulu is poor. AQI is the main air quality indicator at 61.8/100. Pollution peaks around 11:00 PM (PM10: 61.8/100).
Will air quality be worse tomorrow in Honolulu?
On 10 August 2026, air quality conditions in Honolulu will be similar to today, with AQI forecast at poor at 66.2/100. Pollution peaks around 12:00 AM (PM10: 66.2/100).
When is air pollution at its worst in Honolulu?
Honolulu's air quality follows a clear seasonal pattern: the cleanest stretches usually come in spring and fall, between the summer ozone season and the calmer winter pollution episodes, but hot, humid summer conditions drive ozone formation, especially during heat waves. Calm, cold winter spells can occasionally allow local pollution to build up before the next weather system clears it.
Are air quality levels in Honolulu based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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