Worst air pollution Duncan, today and tomorrow
Today (15 July): Air quality in Duncan is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 AM (O3: 40.3/100).
Tomorrow (16 July 2026): Air quality in Duncan is fair. NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 5:00 AM (O3: 49.1/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Duncan's air quality benefits from the sheltered Cowichan Valley's mild climate, with Trans-Canada Highway traffic the primary local source amid otherwise favourable Vancouver Island ventilation.
Today - 15 July | Pollution peaks at 05:00
AQI:
Medium
40.3/100
PM2.5 (fine particles):
Good
9.0/100
PM10 (coarse particles):
Good
3.4/100
NO2 (nitrogen dioxide):
Good
18.9/100
O3 (ozone):
Medium
40.3/100
SO2 (sulfur dioxide):
Good
4.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.5/100
PM1 (ultrafine particles):
Good
9.9/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 05:00
AQI:
Medium
49.1/100
PM2.5 (fine particles):
Good
10.6/100
PM10 (coarse particles):
Good
3.5/100
NO2 (nitrogen dioxide):
Fair
20.5/100
O3 (ozone):
Medium
49.1/100
SO2 (sulfur dioxide):
Good
3.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.8/100
PM1 (ultrafine particles):
Good
12.3/100
Pollen forecast in Duncan
View pollen forecastFrequently Asked Questions
Is air quality bad in Duncan right now?
On 15 July 2026, overall air quality in Duncan is medium. AQI is the main air quality indicator at 40.3/100. Pollution peaks around 5:00 AM (O3: 40.3/100).
Will air quality be worse tomorrow in Duncan?
On 16 July 2026, air quality conditions in Duncan will be worse than today, with NO2 forecast at fair at 20.5/100. Pollution peaks around 5:00 AM (O3: 49.1/100).
When is air pollution at its worst in Duncan?
Duncan's air quality varies through the year, influenced by the Cowichan Valley farmland and forest surrounding it on Vancouver Island. Mild, wet winters keep the air generally clean, while dry summer spells occasionally allow haze and, in bad years, wildfire smoke to build up. Frequent Pacific storms during the cooler months usually clear the air completely within a day.
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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app