Worst air pollution Multnomah Falls - Portland, today and tomorrow
Today (15 July): Air quality in Multnomah Falls is fair. NO2 is fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 AM (O3: 41.5/100).
Tomorrow (16 July 2026): Air quality in Multnomah Falls is fair. AQI worsens to fair; NO2 decreases to good; 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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Portland's Multnomah Falls air quality benefits from the Columbia River Gorge's powerful channelled winds, with the Gorge's consistent easterly and westerly winds providing reliable and often dramatic ventilation at the base of the 189-metre waterfall. Vehicle traffic on the Historic Columbia River Highway contributes modest local sources, while the Gorge's powerful natural wind acceleration and the waterfall's misting provide natural atmospheric conditions and summer wildfire smoke is the primary seasonal concern throughout the year.
Today - 15 July | Pollution peaks at 07:00
AQI:
Medium
41.5/100
PM2.5 (fine particles):
Good
8.3/100
PM10 (coarse particles):
Good
4.3/100
NO2 (nitrogen dioxide):
Fair
30.0/100
O3 (ozone):
Medium
41.5/100
SO2 (sulfur dioxide):
Good
3.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.5/100
PM1 (ultrafine particles):
Good
6.8/100
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
7.7/100
PM10 (coarse particles):
Good
3.0/100
NO2 (nitrogen dioxide):
Good
15.8/100
O3 (ozone):
Fair
36.7/100
SO2 (sulfur dioxide):
Good
3.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.0/100
PM1 (ultrafine particles):
Good
7.2/100
Other Landmarks in Portland
Frequently Asked Questions
Is air quality bad in Multnomah Falls right now?
On 15 July 2026, overall air quality in Multnomah Falls is fair. NO2 is the main pollutant at 30.0/100. Pollution peaks around 7:00 AM (O3: 41.5/100).
Will air quality be worse tomorrow in Multnomah Falls?
On 16 July 2026, air quality conditions in Multnomah Falls will be similar to 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 Multnomah Falls?
Air quality at Multnomah Falls shifts across the year, as winter and spring bring the cleanest air, as frequent rain and consistent onshore wind clear pollution quickly; by contrast, the driest weeks of late summer bring the greatest risk of smoke drifting in from regional wildfires. Coastal areas see relatively little of the smoke that can settle into inland valleys during fire season.
Are air quality levels in Multnomah Falls 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