Worst air pollution Glacier, today and tomorrow
Today (20 September): Air quality in Glacier is moderate. AQI and PM2.5 are moderate; NO2 and O3 are fair; PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 PM (PM2.5: 44.9/100).
Tomorrow (21 September 2026): Air quality in Glacier is moderate. PM10 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 AM (PM2.5: 46.3/100). 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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Glacier National Park's air quality benefits from its exceptional Montana Rocky Mountain position, with consistent Pacific westerly winds providing outstanding maritime and mountain ventilation through the Continental Divide wilderness. The extraordinary remote wilderness generally maintains excellent conditions with outstanding visibility, while summer wildfire smoke from surrounding Montana, Idaho, and BC forests has become an increasingly severe and prolonged seasonal challenge and the park generally maintains very good baseline conditions during smoke-free periods throughout the year.
Today - 20 September | Pollution peaks at 22:00
AQI:
Moderate
44.9/100
PM2.5 (fine particles):
Moderate
44.9/100
PM10 (coarse particles):
Good
19.9/100
NO2 (nitrogen dioxide):
Fair
27.4/100
O3 (ozone):
Fair
20.2/100
SO2 (sulfur dioxide):
Good
1.5/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
1.8/100
PM1 (ultrafine particles):
Good
6.5/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 11:00
AQI:
Moderate
46.3/100
PM2.5 (fine particles):
Moderate
46.3/100
PM10 (coarse particles):
Fair
23.3/100
NO2 (nitrogen dioxide):
Fair
30.4/100
O3 (ozone):
Fair
36.5/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
2.5/100
PM1 (ultrafine particles):
Good
5.5/100
Pollen forecast in Glacier
View pollen forecastFrequently Asked Questions
Is air quality bad in Glacier right now?
On 20 September 2026, overall air quality in Glacier is moderate. AQI is the main air quality indicator at 44.9/100. Pollution peaks around 10:00 PM (PM2.5: 44.9/100).
Will air quality be worse tomorrow in Glacier?
On 21 September 2026, air quality conditions in Glacier will be similar to today, with AQI forecast at moderate at 46.3/100. Pollution peaks around 11:00 AM (PM2.5: 46.3/100).
When is air pollution at its worst in Glacier?
Glacier National Park follows Glacier's typical seasonal air quality pattern: the shoulder seasons of spring and fall typically offer the most stable, cleanest conditions, but winter temperature inversions can trap cold air and pollution in valleys and basins for days at a time. Higher-elevation, more exposed locations generally avoid the worst of the valley inversion episodes.
Are air quality levels in Glacier 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 14:33 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.
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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