🚧 This is a pilot page for Canadian cities. Data is sourced from Environment and Climate Change Canada (ECCC) and is currently in testing.

Montreal, QC

Canadian pilot

What this page tells you

This page combines annual PM2.5, unhealthy days, 5-year trend, and data coverage so you can compare long-term air quality, not just today's reading.

Jump to indoor air guidance Read the formula

📍 Homebuyer Guide 📊 Data Coverage: 97.8% 📅 2021-2025 Trends

Montreal, QC air quality summary: Our analysis of Montreal, QC results in a clean air score of 74, earning a B grade overall. At 8.6 µg/m³, PM2.5 levels are high enough to be monitored but not immediately alarming. The data suggests that Montreal is on a positive trajectory for air cleanliness.

Clean Air Score

Grade B

B-graded cities maintain respectable air standards with moderate particulate levels.

🏡 What This Means for Buying

Air quality is a key component of long-term health and should be considered when looking at Montreal real estate.

Best time for outdoor visits: Check seasonal chart

Indoor Air Quality in Montreal, QC

Outdoor pollution can still affect indoor air when windows are open, filtration is weak, or wildfire smoke moves in.

Common indoor air concerns in Montreal:

Seasonal pollen and dust mite allergens
VOCs from household products

💡 Recommended action: When AQI exceeds 100, use HEPA air purifiers and keep windows closed.

People also search: "indoor air quality in Montreal, QC"

🩺 My Health Risk Assessment

See how Montreal's air quality affects you and your family specifically.

Current Risk Level

Moderate Risk

🟡

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Health Advice

Good for most outdoor activities.

Est. Annual "Risky Days" for you: ~15 days/year

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🏡 Property Value Impact Analysis

Estimated Impact (5-Year)

Positive Signal

+4.4% theoretical value retention

Between 2013 and 2024, Montreal's air quality improved by 1.1 μg/m³. Based on NBER studies, this change correlates with a estimated 4.4% increase in relative property value retention.

Cleaner Alternatives in Quebec

No cleaner cities found in this state. Montreal is already a top performer!

* Methodology: Comparison based on National Bureau of Economic Research (NBER) Working Paper 15655 correlation between PM2.5 reduction and housing prices. This is a theoretical estimate for informational purposes only.

Annual PM2.5

8.6 μg/m³

WHO Target: <5.0

Good Days

95.9 %

% days AQI < 100

5-Year Trend

Improving

↑ Improving

Long-term direction

Extreme Days

5 days/yr

Days AQI > 150 (Est.)

Why Montreal earned a 74

Raw inputs, scoring weights, and data coverage for this city.

See full formula

Annual Air Quality

8.6 μg/m³

Component score 79 × 40% = 31.6 points

Unhealthy Days

15 days/yr est.

4.1% of days above AQI 100. Component score 88 × 25% = 22.0 points

5-Year Trend

Improving

Component score 81 × 20% = 16.2 points

Seasonal Variability

Higher means steadier month-to-month air. Weighted contribution: 6.9 points

Extreme Events

Captures severe pollution spikes. Weighted contribution: 3.7 points

Coverage & Monitoring

97.8%

Direct ECCC city monitor

📅 Past 30 Days Trend

Real-time daily PM2.5 AQI

Live Data

Score Breakdown

Component	Weight	Score Contribution
Annual Air Quality	40%	79
Unhealthy Days	25%	88
5-Year Trend	20%	81
Seasonal Variability	10%	69
Extreme Events	5%	73

Explore More Air Quality Data

View more cities in Canada See how Montreal compares nationally

Frequently Asked Questions

How often is this air quality data updated? Our historical trend models and annual rankings are updated regularly based on official ECCC data to ensure reports reflect the latest available long-term trends.

What sources does CleanAirData use? We rely strictly on official Environment and Climate Change Canada (ECCC) monitoring station data for all historical air quality scoring and reports.

Data sourced from Environment and Climate Change Canada (ECCC) — See our methodology

Canadian Content Disclaimer: This page is part of a limited pilot program for Canadian users. Air quality measurements are provided for informational purposes only and do not constitute official health advice.

For official health guidance related to air quality in Canada, please consult the Health Canada website.

About This Data

Data Sources

Historical air quality mapping and scoring are based completely on official U.S. Environmental Protection Agency (EPA) AirNow API data. 5-day AQI forecasts are provided by WAQI.

Methodology

Our Clean Air Score (0-100) is a proprietary algorithm that weighs multiple factors:

Annual PM2.5 averages (40%)
Frequency of unhealthy days (25%)
5-year pollution trends (20%)
Seasonal variability and extreme events (15%)

Updates & Accuracy

Real-time data is updated hourly. Historical aggregate scores are recalculated monthly to reflect the latest trends. While we strive for accuracy, sensor maintenance and local conditions can affect individual readings.

Practical Advice

When AQI > 100: Sensitive groups (children, elderly, asthmatics) should limit prolonged outdoor exertion.
When AQI > 150: Everyone should avoid outdoor exercise and keep windows closed.

Data provided for informational purposes only. Always consult local health officials during extreme smoke or pollution events.