Worst air pollution Ketchum, today and tomorrow
Today (9 August): Air quality in Ketchum is fair. O3 is fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 AM (NO2: 42.1/100).
Tomorrow (10 August 2026): Air quality in Ketchum is fair. All pollutants stay as today. Pollution peaks around 4:00 PM (NO2: 46.0/100). Airmine updates local air quality forecasts four times daily.
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In Ketchum, high mountain air is the main influence on air quality, and wildfire smoke drifting from central Idaho is the main summer concern. Most days bring generally favorable conditions here, with occasional exceptions tied to shifting weather patterns. Local topography and prevailing winds both play a role in how quickly conditions change.
Today - 9 August | Pollution peaks at 00:00
AQI:
Medium
42.1/100
PM2.5 (fine particles):
Good
16.5/100
PM10 (coarse particles):
Good
7.3/100
NO2 (nitrogen dioxide):
Medium
42.1/100
O3 (ozone):
Fair
36.8/100
SO2 (sulfur dioxide):
Good
5.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.7/100
PM1 (ultrafine particles):
Good
13.1/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 16:00
AQI:
Medium
46.0/100
PM2.5 (fine particles):
Good
16.1/100
PM10 (coarse particles):
Good
8.9/100
NO2 (nitrogen dioxide):
Medium
46.0/100
O3 (ozone):
Fair
31.8/100
SO2 (sulfur dioxide):
Good
5.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.4/100
PM1 (ultrafine particles):
Good
11.3/100
Pollen forecast in Ketchum
View pollen forecastFrequently Asked Questions
Is air quality bad in Ketchum right now?
On 9 August 2026, overall air quality in Ketchum is fair. O3 is the main pollutant at 36.8/100. Pollution peaks around 12:00 AM (NO2: 42.1/100).
Will air quality be worse tomorrow in Ketchum?
On 10 August 2026, air quality conditions in Ketchum will be similar to today, with O3 forecast at fair at 31.8/100. Pollution peaks around 4:00 PM (NO2: 46.0/100).
When is air pollution at its worst in Ketchum?
Ketchum's air quality has a clear seasonal rhythm: the shoulder seasons of spring and fall typically offer the most stable, cleanest conditions, but summer brings regional wildfire smoke, while winter brings its own inversion-driven pollution episodes. Higher-elevation, more exposed locations generally avoid the worst of the valley inversion episodes.
Are air quality levels in Ketchum 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: 9 August 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.
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