Air quality in Saint-Léonard
Most recent reading from the official reporting area covering Saint-Léonard.
Preliminary readings from official networks, not fully validated. For health decisions follow your doctor and your local environmental agency.
AQHI
1.4
Low (1 to 3)
Cornwall · 10/16/26, 5:00 AM UTC
What to do
Low (1 to 3)
Normal outdoor activity.
AQHI
| Range | What to do |
|---|---|
| Low (1 to 3) | Normal outdoor activity. |
| Moderate (4 to 6) | People with symptoms may ease off outdoors. |
| High (7 to 10) | Sensitive groups should reduce or reschedule outdoor activity. |
| Very high (above 10) | Everyone should reduce outdoor exertion. |
Choose a city
- Saint-Michel56,420 inhabitants
- Montréal-Nord86,857 inhabitants
- Villeray–Saint-Michel–Parc-Extension144,814 inhabitants
- Mercier–Hochelaga-Maisonneuve142,753 inhabitants
- Rosemont–La Petite-Patrie146,501 inhabitants
- Rivière-des-Prairies–Pointe-aux-Trembles113,868 inhabitants
- Ahuntsic-Cartierville135,336 inhabitants
Data from 10/16/26, 6:00 AM UTC
- Environment and Climate Change Canada — AQHILicence: ECCC End-use Licence (uso livre com citação da fonte) · Credit: Environment and Climate Change Canada
- GeoNames cities15000Licence: CC BY 4.0 · Credit: Dados de cidades: GeoNames (CC BY 4.0)
- Dados de cidades: GeoNames (CC BY 4.0)
How to read these numbers
The value is preliminary: networks publish a reading within about an hour and validate it later. It is good for deciding whether to go running today, not for legal comparison between years.
Frequently asked questions
- What is the air quality in Saint-Léonard right now?
- The large number at the top is the latest reading from the reporting area that includes Saint-Léonard, with the observation time beside it.
- What about tomorrow?
- Where the agency publishes a forecast, it appears in the day table. Forecasts are made by the network’s own meteorologists with a dispersion model.
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