Worst air pollution Byward Market - Ottawa, today and tomorrow
Today (30 August): Air quality in Byward Market is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 1:00 PM (O3: 19.3/100).
Tomorrow (31 August 2026): Air quality in Byward Market is moderate. AQI worsens to moderate; NO2 increases to moderate; all other pollutants stay as today. Pollution peaks around 11:00 PM (NO2: 42.6/100). 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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In Byward Market, road traffic and general city density are the leading contributors to particulate matter and nitrogen dioxide here. Tree cover in the area softens the impact somewhat, catching particulates before they disperse further. Actual daily readings vary with weather, time of day, and short-term local activity. The surrounding area tends to follow a similar pattern, with only minor local variation.
Today - 30 August | Pollution peaks at 13:00
AQI:
Good
19.3/100
PM2.5 (fine particles):
Good
7.4/100
PM10 (coarse particles):
Good
3.0/100
NO2 (nitrogen dioxide):
Good
18.2/100
O3 (ozone):
Good
19.3/100
SO2 (sulfur dioxide):
Good
2.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.1/100
PM1 (ultrafine particles):
Good
3.8/100
Levels show the poorest local air quality during the day
Tomorrow - 31 August | Pollution peaks at 23:00
AQI:
Moderate
42.6/100
PM2.5 (fine particles):
Good
10.6/100
PM10 (coarse particles):
Good
4.3/100
NO2 (nitrogen dioxide):
Moderate
42.6/100
O3 (ozone):
Good
19.1/100
SO2 (sulfur dioxide):
Good
4.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.6/100
PM1 (ultrafine particles):
Good
4.6/100
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Frequently Asked Questions
Is air quality bad in Byward Market right now?
On 30 August 2026, overall air quality in Byward Market is good. AQI is the main air quality indicator at 19.3/100. Pollution peaks around 1:00 PM (O3: 19.3/100).
Will air quality be worse tomorrow in Byward Market?
On 31 August 2026, air quality conditions in Byward Market will be worse than today, with AQI forecast at moderate at 42.6/100. Pollution peaks around 11:00 PM (NO2: 42.6/100).
When is air pollution at its worst in Byward Market?
Winter months routinely see the year's steepest rise in particulate matter across this urban area, when dense traffic emissions and home heating pile up under temperature inversions that resist mixing. The warmer months shift the main air quality risk here toward ground-level ozone, which forms readily from traffic emissions baking in strong sunlight, and can spike further during wildfire smoke events.
Are air quality levels in Byward Market 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: 30 August 2026 at 20:26 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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