Worst air pollution Willamette Waterfront - Portland, today and tomorrow
Today (20 September): Air quality in Willamette Waterfront is fair. AQI and PM2.5 are fair; PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 AM (PM2.5: 21.5/100).
Tomorrow (21 September 2026): Air quality in Willamette Waterfront is good. AQI improves to good; PM2.5 decreases to good; all other pollutants stay as today. Pollution peaks around 10:00 AM (O3: 17.8/100). Airmine updates local air quality forecasts four times daily.
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Portland's Willamette Waterfront and the Tom McCall Waterfront Park record good air quality along the river, with consistent Willamette River breezes providing ventilation and the park's open geometry aiding dispersal of downtown emissions. The river corridor is one of Portland's more reliable clean-air locations on days with any appreciable wind.
Today - 20 September | Pollution peaks at 03:00
AQI:
Fair
21.5/100
PM2.5 (fine particles):
Fair
21.5/100
PM10 (coarse particles):
Good
12.6/100
NO2 (nitrogen dioxide):
Good
10.5/100
O3 (ozone):
Good
18.7/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
2.8/100
PM1 (ultrafine particles):
Good
3.0/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 10:00
AQI:
Good
17.8/100
PM2.5 (fine particles):
Good
14.1/100
PM10 (coarse particles):
Good
8.2/100
NO2 (nitrogen dioxide):
Good
7.1/100
O3 (ozone):
Good
17.8/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
3.9/100
PM1 (ultrafine particles):
Good
2.5/100
Other Landmarks in Portland
Frequently Asked Questions
Is air quality bad in Willamette Waterfront right now?
On 20 September 2026, overall air quality in Willamette Waterfront is fair. AQI is the main air quality indicator at 21.5/100. Pollution peaks around 3:00 AM (PM2.5: 21.5/100).
Will air quality be worse tomorrow in Willamette Waterfront?
On 21 September 2026, air quality conditions in Willamette Waterfront will be better than today, with AQI forecast at good at 17.8/100. Pollution peaks around 10:00 AM (O3: 17.8/100).
When is air pollution at its worst in Willamette Waterfront?
Conditions at Willamette Waterfront vary noticeably across the seasons: winter and spring bring the cleanest air, as frequent rain and consistent onshore wind clear pollution quickly, but August and September wildfire smoke can dominate the season, occasionally driving particulate levels sharply higher for several days. Winter temperature inversions can briefly trap wood-smoke in low-lying valleys, but these episodes are usually short-lived.
Are air quality levels in Willamette Waterfront 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: 20 September 2026 at 20:27 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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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