Worst air pollution Hilo, today and tomorrow
Today (15 July): Air quality in Hilo is very poor. AQI and PM10 are very poor; PM2.5 is poor; O3 and PM1 are fair; NO2, SO2, CO, and HCHO are good. Pollution peaks around 5:00 PM (PM10: 100/100).
Tomorrow (16 July 2026): Air quality in Hilo is very poor. PM2.5 decreases to medium; O3 decreases to good; PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 11:00 PM (PM10: 80.1/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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In Hilo, volcanic vog from Kilauea is the main influence on air quality, and vog (volcanic smog) is the dominant, variable air quality factor. Day-to-day conditions in Hilo can still vary with local weather, wind direction, and time of year. As with most US destinations, conditions here are best understood by season rather than by a single yearly average.
Today - 15 July | Pollution peaks at 17:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Poor
78.0/100
PM10 (coarse particles):
Very poor
100/100
NO2 (nitrogen dioxide):
Good
1.2/100
O3 (ozone):
Fair
25.4/100
SO2 (sulfur dioxide):
Good
2.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Fair
24.0/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 23:00
AQI:
Very poor
80.1/100
PM2.5 (fine particles):
Medium
55.7/100
PM10 (coarse particles):
Very poor
80.1/100
NO2 (nitrogen dioxide):
Good
1.0/100
O3 (ozone):
Good
18.9/100
SO2 (sulfur dioxide):
Good
1.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.9/100
PM1 (ultrafine particles):
Good
13.6/100
Frequently Asked Questions
Is air quality bad in Hilo right now?
On 15 July 2026, overall air quality in Hilo is very poor. AQI is the main air quality indicator at 100/100. Pollution peaks around 5:00 PM (PM10: 100/100).
Will air quality be worse tomorrow in Hilo?
On 16 July 2026, air quality conditions in Hilo will be similar to today, with AQI forecast at very poor at 80.1/100. Pollution peaks around 11:00 PM (PM10: 80.1/100).
When is air pollution at its worst in Hilo?
Hilo's air quality follows a clear seasonal pattern — between summer ozone and occasional winter inversions, spring and fall are the year's cleanest stretch, whereas prolonged summer heat waves are when air quality most often dips into unhealthy territory. Calm, cold winter spells can occasionally allow local pollution to build up before the next weather system clears it.
Are air quality levels in Hilo 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.
Want to see air quality forecasts for other cities in United States?
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app