Worst air pollution Hillsboro, today and tomorrow
Today (15 July): Air quality in Hillsboro is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 AM (O3: 41.5/100).
Tomorrow (16 July 2026): Air quality in Hillsboro is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 4:00 AM (O3: 36.7/100). 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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Hillsboro's air quality reflects Oregon's Silicon Forest technology corridor west of Portland, with vehicle emissions from US-26 and the Intel, Nike, and semiconductor manufacturing campus generating industrial and cleanroom exhaust emissions alongside primary vehicle sources. The Tualatin Valley's partial topographic enclosure between the Coast Range and Tualatin Mountains concentrates emissions under winter inversions, while summer wildfire smoke is an increasingly severe seasonal concern.
Today - 15 July | Pollution peaks at 07:00
AQI:
Medium
41.5/100
PM2.5 (fine particles):
Good
4.9/100
PM10 (coarse particles):
Good
2.5/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Medium
41.5/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
6.5/100
PM1 (ultrafine particles):
Good
4.0/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 04:00
AQI:
Fair
36.7/100
PM2.5 (fine particles):
Good
4.5/100
PM10 (coarse particles):
Good
1.7/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
36.7/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
5.0/100
PM1 (ultrafine particles):
Good
4.2/100
Pollen forecast in Hillsboro
View pollen forecastFrequently Asked Questions
Is air quality bad in Hillsboro right now?
On 15 July 2026, overall air quality in Hillsboro is medium. AQI is the main air quality indicator at 41.5/100. Pollution peaks around 7:00 AM (O3: 41.5/100).
Will air quality be worse tomorrow in Hillsboro?
On 16 July 2026, air quality conditions in Hillsboro will be worse than today, with AQI forecast at fair at 36.7/100. Pollution peaks around 4:00 AM (O3: 36.7/100).
When is air pollution at its worst in Hillsboro?
Like most US cities, Hillsboro sees air quality shift from season to season: the wet winter and spring months are generally the cleanest, with regular rain limiting particulate buildup, but by late summer, wildfire smoke can override the region's usual clean-air advantage for days at a time. Coastal areas see relatively little of the smoke that can settle into inland valleys during fire season.
Are air quality levels in Hillsboro 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.
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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