Air Quality Index (AQI) in Canada 🇨🇦
Live Air Quality Index (AQI) and PM2.5 Levels in Canada
Currently, the Air Quality Index (AQI) in Ottawa, the capital of Canada, is measured at a score of 31. According to the US EPA health standard, this air quality rating is categorized as Good. The current atmosphere in Ottawa is influenced by a PM2.5 (fine particulate matter) concentration of 5.5 µg/m³ and PM10 levels recorded at 5.6 µg/m³. Monitoring of gaseous pollutants shows Nitrogen Dioxide (NO2) at 9.1 µg/m³.
Beyond the primary urban hubs, atmospheric conditions and smog levels fluctuate across Canada based on industrial output, traffic density, and local weather patterns. Real-time pollution data and respiratory health alerts are also being actively monitored in cities like Toronto, Montréal, Calgary, Edmonton and Winnipeg. Tracking these air quality metrics is essential for residents nationwide to manage outdoor exposure and maintain respiratory safety during periods of increased particulate concentration.
Canada Air Quality: Major Cities Index
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Pollution Monitor & AQI Forecast: Canada Regions
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* Air Quality Index (AQI) data for Canada is calculated using the US EPA standard. Information is processed from multiple monitoring stations detecting PM2.5, PM10, and gaseous pollutants to ensure accuracy for respiratory health planning.
Browse Air Quality in Canada by cities in alphabetical order:
Frequently Asked Questions about Air Quality in Canada
What is the air quality in Canada right now?
The current AQI in Ottawa (capital of Canada) is 31 — categorised as Good. Conditions vary across the country — see AQI for all cities for a complete picture.
Which city in Canada has the worst air quality right now?
Right now, Calgary has the highest AQI reading in Canada at 90 (Moderate).
Which city in Canada has the best air quality right now?
Halifax currently has the lowest AQI in Canada at 14 (Good).
What is the PM2.5 level in Ottawa today?
Is the air in Canada safe to breathe today?
Most cities in Canada currently report acceptable air-quality levels, though local conditions vary.
What are the cleanest cities in Canada right now?
Top 5 cities in Canada with the best (lowest) AQI right now:
- Halifax: AQI 14 — Good
- Nepean: AQI 18 — Good
- Winnipeg: AQI 19 — Good
- Ottawa: AQI 31 — Good
- Gatineau: AQI 32 — Good
What are the most polluted cities in Canada right now?
Top 5 cities in Canada with the worst (highest) AQI right now:
- Calgary: AQI 90 — Moderate
- Windsor: AQI 75 — Moderate
- Montréal: AQI 73 — Moderate
- Laval: AQI 73 — Moderate
- Longueuil: AQI 73 — Moderate
Air Quality Scales & Resources
Wondering what these AQI numbers mean for your health? Our worldwide air quality guide explains every level of the AQI, PM2.5, PM10, ozone, NO2, CO and SO2 scales, with practical health advice for each range.
→ Understanding Air Quality Levels: read the full guide