🇨🇦QuebecModerate Wildfire Smoke Risk

Air Quality in Montreal, Quebec

Montreal's industrial heritage and river basin location create air quality challenges, particularly in winter when thermal inversions trap emissions. The city has improved significantly but still faces traffic-related pollution and industrial sources.

Annual PM2.5 Average:~8.1 µg/m³— WHO guideline: 5 µg/m³

đź“Š AQHI Monitoring

Quebec uses the IQA (Indice de la qualité de l'air) alongside the national AQHI. Réseau de surveillance de la qualité de l'air (RSQA) operates 13 monitoring stations across Montreal.

Data source: RSQA Montreal

⚠️ Key Pollutants

  • Traffic NOx and PM2.5 on major arteries
  • Industrial emissions from east-end refineries
  • Woodsmoke in winter
  • Summer ozone events

Air Quality Challenges in Montreal

Montreal's east end has historically higher pollution levels due to refinery and port operations. Winter temperature inversions in the St. Lawrence valley trap pollutants. Spring melt releases road salt particulates.

Concerned About Montreal Air Quality? Your Home is Where You Can Take Action.

Studies show indoor air can be 2–5× more polluted than outdoor air. For Montreal residents — especially during wildfire smoke events or winter inversions — a HEPA air purifier removes 90%+ of PM2.5, smoke particles and allergens where you spend most of your time.

Indoor Air Quality Tips for Montreal Residents

  • âś“Check donnĂ©es.montreal.ca/air for real-time RSQA data
  • âś“East Montreal residents should consider HEPA filtration year-round
  • âś“Monitor for industrial flaring events near Pointe-aux-Trembles
  • âś“Woodsmoke bans active during high pollution periods in winter

Understanding Canada's AQHI Scale

The Air Quality Health Index (AQHI) is specifically designed to communicate health risk, combining PM2.5, ozone and NO2 into a single health-focused number.

1–3
Low Risk
Ideal for outdoor activities
4–6
Moderate Risk
Consider reducing exertion
7–10
High Risk
Reduce outdoor activities
10+
Very High Risk
Stay indoors — run air purifier

Frequently Asked Questions

What is the air quality like in Montreal?+
Montreal's industrial heritage and river basin location create air quality challenges, particularly in winter when thermal inversions trap emissions. The city has improved significantly but still faces traffic-related pollution and industrial sources.
What is the AQHI in Montreal today?+
The current AQHI for Montreal is available from RSQA Montreal. Quebec uses the IQA (Indice de la qualité de l'air) alongside the national AQHI. Réseau de surveillance de la qualité de l'air (RSQA) operates 13 monitoring stations across Montreal.
Is wildfire smoke a problem in Montreal?+
Montreal has a moderate risk from wildfire smoke. Wildfire smoke events do occur but less frequently than in BC and Alberta.

Protect Your Indoor Air Quality in Montreal

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