Air quality in Canada

Air quality in Quebec today

Updated Sun, 25 Oct 2026 19:43:35 GMT

Moderate: average US AQI 55 across 11 cities in Quebec Worst now: Montréal (55); cleanest: Gatineau (52).

Live US AQI, PM2.5 and ozone for cities across Quebec, compared with the Canada average.

Right now the modelled air quality in Quebec averages a US AQI of 55 (Moderate) across the 11 cities we track. By category: 11 Moderate (of 11).

That is 11 points worse than the Canada average of 44, ranking 10 of 10 provinces from cleanest to most polluted.

Montréal has the worst air at 55 (PM2.5 7.5 µg/m³), and Gatineau the cleanest at 52. No tracked city is above 100, so no group needs to change plans.

Quebec cities by AQI (most polluted first)

City	US AQI	Category	PM2.5 µg/m³	PM10 µg/m³	Ozone µg/m³
Montréal	55	Moderate	7.5	8	46
Laval	55	Moderate	7.5	8	46
Longueuil	55	Moderate	7.5	8	46
Rosemont–La Petite-Patrie	55	Moderate	7.5	8	46
Villeray–Saint-Michel–Parc-Extension	55	Moderate	7.5	8	46
Mercier–Hochelaga-Maisonneuve	55	Moderate	7.5	8	46
Le Plateau-Mont-Royal	55	Moderate	7.5	8	46
Ville-Marie	55	Moderate	7.5	8	46
Québec	54	Moderate	7.1	7	52
Lévis	54	Moderate	7.1	7	52
Gatineau	52	Moderate	5.2	5	67

US AQI	Category	What it means
0-50	Good	Air quality is satisfactory and poses little or no risk; a good time for outdoor activity.
51-100	Moderate	Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors.
101-150	Unhealthy for Sensitive Groups	People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors.
151-200	Unhealthy	Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed.
201-300	Very Unhealthy	Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors.
301-500	Hazardous	Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500.

Modelled by CAMS (Copernicus) via Open-Meteo, refreshed twice a day; read hour by hour from the forecast.