Duncan Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Duncan is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 AM (O3: 15.2/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in Duncan is fair. AQI worsens to fair; NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 1:00 PM (NO2: 21.4/100).
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Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Good | 15.2/100 |
| PM2.5 (fine particles) | Good | 9.9/100 |
| PM10 (coarse particles) | Good | 10.4/100 |
| NO2 (nitrogen dioxide) | Good | 10.0/100 |
| O3 (ozone) | Good | 15.2/100 |
| SO2 (sulfur dioxide) | Good | 0.3/100 |
| CO (carbon monoxide) | Good | 0.5/100 |
| HCHO (formaldehyde) | Good | 0.8/100 |
| PM1 (ultrafine particles) | Good | 2.7/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 21.4/100 |
| PM2.5 (fine particles) | Good | 14.6/100 |
| PM10 (coarse particles) | Good | 13.5/100 |
| NO2 (nitrogen dioxide) | Fair | 21.4/100 |
| O3 (ozone) | Good | 15.9/100 |
| SO2 (sulfur dioxide) | Good | 0.3/100 |
| CO (carbon monoxide) | Good | 0.6/100 |
| HCHO (formaldehyde) | Good | 1.3/100 |
| PM1 (ultrafine particles) | Good | 6.0/100 |
Local Environmental Conditions
Around the heart of Duncan, a mix of built-up land and open space means traffic is an important, but not overwhelming, local pollution source. Its setting in the Cowichan Valley means cold air and pollution can get trapped close to the ground during calm spells. Home heating, especially wood stoves and fireplaces, adds smoke and fine particles in the colder months.
Calm, cold weather from November to March, averaging 4°C, lets the valley fill with pollution from home heating and traffic overnight. By contrast, with summer temperatures averaging only about 19°C, ozone rarely becomes a serious problem. Wildfire season runs roughly from June to August, when smoke from fires, near or far, can bring hazy days and very poor air quality.
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Frequently Asked Questions About Air Quality in British Columbia
Is air quality bad in Duncan right now?
On 10 October 2026, overall air quality in Duncan is good. AQI is the main air quality indicator at 15.2/100. Pollution peaks around 4:00 AM (O3: 15.2/100).
Will air quality be worse tomorrow in Duncan?
On 11 October 2026, air quality conditions in Duncan will be worse than today, with AQI forecast at fair at 21.4/100. Pollution peaks around 1:00 PM (NO2: 21.4/100).
When is air pollution at its worst in Duncan?
Calm, cold weather from November to March, averaging 4°C, lets the valley fill with pollution from home heating and traffic overnight. By contrast, with summer temperatures averaging only about 19°C, ozone rarely becomes a serious problem. Wildfire season runs roughly from June to August, when smoke from fires, near or far, can bring hazy days and very poor air quality.
Are air quality levels in Duncan 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.
Understanding the Scale
The 0–100 air quality scores represent risk levels, not direct air pollutant concentrations. Higher scores indicate higher risk.
Air Quality
| Good | 0-20 | Low air quality risk. Air quality is expected to be good, with low levels of pollution. |
| Fair | 20-40 | Generally low air quality risk. Air quality is expected to be acceptable, with some pollution present. |
| Moderate | 40-60 | Moderate air quality risk. Air pollution is elevated and air quality may be less favorable. |
| Poor | 60-80 | High air quality risk. Air pollution is high and air quality is expected to be poor. |
| Very Poor | 80-100 | Very high air quality risk. Air pollution is very high and air quality is expected to be very poor. |