Worst air pollution Mount Shasta, today and tomorrow
Today (9 August): Air quality in Mount Shasta is fair. O3 and PM1 are fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, and HCHO are good. Pollution peaks around 10:00 PM (NO2: 43.3/100).
Tomorrow (10 August 2026): Air quality in Mount Shasta is fair. AQI worsens to fair; NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 12:00 AM (NO2: 33.9/100). Airmine updates local air quality forecasts four times daily.
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In Mount Shasta, clean far-northern California mountain air is the main influence on air quality, and summer wildfire smoke is the main recurring seasonal concern. That mix of factors is fairly representative of towns in this part of the country. Checking current readings is still the best way to plan outdoor activity around Mount Shasta.
Today - 9 August | Pollution peaks at 22:00
AQI:
Medium
43.3/100
PM2.5 (fine particles):
Good
18.4/100
PM10 (coarse particles):
Good
5.7/100
NO2 (nitrogen dioxide):
Medium
43.3/100
O3 (ozone):
Fair
35.1/100
SO2 (sulfur dioxide):
Good
5.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.2/100
PM1 (ultrafine particles):
Fair
20.8/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 00:00
AQI:
Fair
33.9/100
PM2.5 (fine particles):
Good
18.9/100
PM10 (coarse particles):
Good
9.6/100
NO2 (nitrogen dioxide):
Fair
33.9/100
O3 (ozone):
Fair
32.4/100
SO2 (sulfur dioxide):
Good
6.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.5/100
PM1 (ultrafine particles):
Fair
20.7/100
Pollen forecast in Mount Shasta
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Mount Shasta
Frequently Asked Questions
Is air quality bad in Mount Shasta right now?
On 9 August 2026, overall air quality in Mount Shasta is fair. O3 is the main pollutant at 35.1/100. Pollution peaks around 10:00 PM (NO2: 43.3/100).
Will air quality be worse tomorrow in Mount Shasta?
On 10 August 2026, air quality conditions in Mount Shasta will be similar to today, with AQI forecast at fair at 33.9/100. Pollution peaks around 12:00 AM (NO2: 33.9/100).
When is air pollution at its worst in Mount Shasta?
Air quality across Mount Shasta rises and falls with the seasons. Typically, winter rains provide the only real relief from an otherwise persistent haze, while summer and early autumn bring the highest ozone levels, and wildfire smoke can spike particulate readings sharply from August through October. Coastal breezes offer some relief compared to inland valley locations that see heavier smog buildup.
Are air quality levels in Mount Shasta 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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