Worst air pollution Ancaster, today and tomorrow
Today (16 July): Air quality in Ancaster is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (O3: 33.2/100).
Tomorrow (17 July 2026): Air quality in Ancaster is fair. All pollutants stay as today. Pollution peaks around 8:00 AM (O3: 27.6/100). 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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Ancaster's air quality benefits from its elevated Niagara Escarpment position above Hamilton's industrial harbour, with the escarpment's elevation and forest cover providing meaningful natural buffering from valley-floor emissions.
Today - 16 July | Pollution peaks at 11:00
AQI:
Fair
33.2/100
PM2.5 (fine particles):
Good
6.9/100
PM10 (coarse particles):
Good
4.0/100
NO2 (nitrogen dioxide):
Good
8.8/100
O3 (ozone):
Fair
33.2/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.8/100
PM1 (ultrafine particles):
Good
4.8/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 08:00
AQI:
Fair
27.6/100
PM2.5 (fine particles):
Good
4.5/100
PM10 (coarse particles):
Good
1.7/100
NO2 (nitrogen dioxide):
Good
6.3/100
O3 (ozone):
Fair
27.6/100
SO2 (sulfur dioxide):
Good
0.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.9/100
PM1 (ultrafine particles):
Good
3.2/100
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Sports venues in Ancaster
Frequently Asked Questions
Is air quality bad in Ancaster right now?
On 16 July 2026, overall air quality in Ancaster is fair. AQI is the main air quality indicator at 33.2/100. Pollution peaks around 11:00 AM (O3: 33.2/100).
Will air quality be worse tomorrow in Ancaster?
On 17 July 2026, air quality conditions in Ancaster will be similar to today, with AQI forecast at fair at 27.6/100. Pollution peaks around 8:00 AM (O3: 27.6/100).
When is air pollution at its worst in Ancaster?
The air over Ancaster varies through the year, influenced by its position atop the Niagara Escarpment above Hamilton. Summer heat can worsen conditions when plant emissions combine with sunlight to form ground-level ozone, while winter inversions occasionally trap industrial pollutants close to the ground on still, cold days. Its elevated position above the valley floor often means slightly cleaner air than the industrial areas below.
Are air quality levels in Ancaster 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