Worst air pollution Forest Park - Portland, today and tomorrow
Today (15 July): Air quality in Forest Park 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 Forest Park 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.
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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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Portland's Forest Park records excellent air quality in North America's largest urban forest, with over 5,000 acres of temperate rainforest canopy providing outstanding natural filtration on Portland's west hills. The elevated ridge position above the Willamette Valley and consistent Pacific maritime airflows keep readings among the lowest in the Portland metropolitan area.
Today - 15 July | Pollution peaks at 07:00
AQI:
Medium
41.5/100
PM2.5 (fine particles):
Good
5.8/100
PM10 (coarse particles):
Good
3.0/100
NO2 (nitrogen dioxide):
Good
8.4/100
O3 (ozone):
Medium
41.5/100
SO2 (sulfur dioxide):
Good
0.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.5/100
PM1 (ultrafine particles):
Good
4.7/100
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
5.3/100
PM10 (coarse particles):
Good
2.0/100
NO2 (nitrogen dioxide):
Good
4.0/100
O3 (ozone):
Fair
36.7/100
SO2 (sulfur dioxide):
Good
0.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.0/100
PM1 (ultrafine particles):
Good
5.0/100
Other Landmarks in Portland
Frequently Asked Questions
Is air quality bad in Forest Park right now?
On 15 July 2026, overall air quality in Forest Park 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 Forest Park?
On 16 July 2026, air quality conditions in Forest Park 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 Forest Park?
Forest Park's air quality follows a clear seasonal pattern, as winter and spring bring the cleanest air, as frequent rain and consistent onshore wind clear pollution quickly; by contrast, late summer wildfire smoke is the biggest concern, sometimes pushing air quality into unhealthy territory for days at a stretch. Winter temperature inversions can briefly trap wood-smoke in low-lying valleys, but these episodes are usually short-lived.
Are air quality levels in Forest Park 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