Worst air pollution Williams Lake, today and tomorrow
Today (20 September): Air quality in Williams Lake is very poor. AQI and NO2 are very poor; PM2.5 and PM1 are fair; PM10, O3, SO2, CO, and HCHO are good. Pollution peaks around 3:00 PM (NO2: 84.9/100).
Tomorrow (21 September 2026): Air quality in Williams Lake is very poor. PM2.5 increases to moderate; PM10 increases to fair; PM1 increases to moderate; all other pollutants stay as today. Pollution peaks around 12:00 PM (NO2: 100/100). 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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Williams Lake's air quality is affected by sawmill operations and summer wildfire smoke, both common to this Cariboo forestry town, with winter inversions trapping woodsmoke in the valley bowl.
Today - 20 September | Pollution peaks at 15:00
AQI:
Very poor
84.9/100
PM2.5 (fine particles):
Fair
28.7/100
PM10 (coarse particles):
Good
16.9/100
NO2 (nitrogen dioxide):
Very poor
84.9/100
O3 (ozone):
Good
15.9/100
SO2 (sulfur dioxide):
Good
2.5/100
CO (carbon monoxide):
Good
1.0/100
HCHO (formaldehyde):
Good
2.7/100
PM1 (ultrafine particles):
Fair
28.5/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 12:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Moderate
47.9/100
PM10 (coarse particles):
Fair
34.4/100
NO2 (nitrogen dioxide):
Very poor
100/100
O3 (ozone):
Good
15.7/100
SO2 (sulfur dioxide):
Good
6.3/100
CO (carbon monoxide):
Good
1.5/100
HCHO (formaldehyde):
Good
10.4/100
PM1 (ultrafine particles):
Moderate
52.6/100
Pollen forecast in Williams Lake
View pollen forecastFrequently Asked Questions
Is air quality bad in Williams Lake right now?
On 20 September 2026, overall air quality in Williams Lake is very poor. AQI is the main air quality indicator at 84.9/100. Pollution peaks around 3:00 PM (NO2: 84.9/100).
Will air quality be worse tomorrow in Williams Lake?
On 21 September 2026, air quality conditions in Williams Lake will be similar to today, with AQI forecast at very poor at 100/100. Pollution peaks around 12:00 PM (NO2: 100/100).
When is air pollution at its worst in Williams Lake?
Williams Lake's air quality follows a seasonal rhythm tied to its position amid the forestry mills of the Cariboo region. Air quality is generally very good outside of wildfire season, though hot, dry summers can bring smoky, hazy stretches when fires burn across the wider region. Local monitoring stations often see their highest readings of the year during major regional fire events.
Are air quality levels in Williams Lake 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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