Worst air pollution Yreka, today and tomorrow
Today (9 August): Air quality in Yreka is poor. AQI and NO2 are poor; O3 is fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (NO2: 60.4/100).
Tomorrow (10 August 2026): Air quality in Yreka is fair. AQI improves to medium; PM2.5 increases to fair; NO2 decreases to medium; SO2 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 PM (NO2: 52.4/100). 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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The dominant factor behind Yreka's air quality is regional wildfire smoke; summer wildfire smoke is the leading regional concern. These factors combine to give Yreka a fairly typical seasonal air quality pattern for this part of the country. None of this replaces checking the current forecast before heading outdoors in Yreka.
Today - 9 August | Pollution peaks at 23:00
AQI:
Poor
60.4/100
PM2.5 (fine particles):
Good
17.9/100
PM10 (coarse particles):
Good
6.2/100
NO2 (nitrogen dioxide):
Poor
60.4/100
O3 (ozone):
Fair
31.7/100
SO2 (sulfur dioxide):
Good
19.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.7/100
PM1 (ultrafine particles):
Good
15.4/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 23:00
AQI:
Medium
52.4/100
PM2.5 (fine particles):
Fair
24.2/100
PM10 (coarse particles):
Good
11.9/100
NO2 (nitrogen dioxide):
Medium
52.4/100
O3 (ozone):
Fair
32.6/100
SO2 (sulfur dioxide):
Fair
21.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.7/100
PM1 (ultrafine particles):
Good
19.0/100
Pollen forecast in Yreka
View pollen forecastFrequently Asked Questions
Is air quality bad in Yreka right now?
On 9 August 2026, overall air quality in Yreka is poor. AQI is the main air quality indicator at 60.4/100. Pollution peaks around 11:00 PM (NO2: 60.4/100).
Will air quality be worse tomorrow in Yreka?
On 10 August 2026, air quality conditions in Yreka will be better than today, with O3 forecast at fair at 32.6/100. Pollution peaks around 11:00 PM (NO2: 52.4/100).
When is air pollution at its worst in Yreka?
Yreka experiences a distinct seasonal swing in air quality, as winter rains provide the only real relief from an otherwise persistent haze; by contrast, hot, sunny summer conditions drive persistent ozone problems, compounded by wildfire smoke risk into early autumn. Coastal breezes offer some relief compared to inland valley locations that see heavier smog buildup.
Are air quality levels in Yreka 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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