What is the air quality in Longueuil today?

The current Air Quality Index (AQI) in Longueuil is 18 (Good). PM2.5 concentration is 4.33 µg/m³.

What is the temperature in Longueuil right now?

The current temperature in Longueuil is 5.1°C (feels like 1.1°C). Humidity is 39.1% and wind speed is 21.5 km/h.

Is it safe to go outside in Longueuil?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in Longueuil, Canada

Clear

5.1°C · 39.1% humidity

5.1°

Feels 1.1°

Good

Air quality is satisfactory. Enjoy outdoor activities.

11 stations

Nearby Monitoring Stations

AQI Forecast

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Station readings

Air Quality Index Trend

46h · 3 stn

View full history →

Longueuil's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

39.1%

Humidity

21.5 km/h

Wind WSW

1029.8 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5

4.33 µg/m³

PM10▲

104.9 µg/m³

050100150200300500

What is the weather forecast for Longueuil?

Temperature & Precipitation

PM2.5 Trend

46h · 3 stations

PM2.54.33 µg/m³ ✓ WHO

Good

PM10104.9 µg/m³

Moderate

UV INDEX0.0

Low

Station readings (11 stations within 25 km)

4.33

Median

4.82

Average

1.0

Low

9.1

High

PM2.5 µg/m³ · Model: 27.1 · Bias: +22.8

What is the 7-day forecast for Longueuil?

10-21

14.6° 5.1°

10-22

12.0° 4.8°

11.56 mm

10-23

13.7° 7.4°

2.56 mm

10-24

14.8° 4.5°

0.5 mm

10-25

18.7° 7.0°

17.56 mm

10-26

8.5° 5.2°

1.19 mm

10-27

9.6° 3.3°

1.5 mm

Both models agree Avg diff: 4.8°C

Where are air quality stations near Longueuil?

canada-montreal-rue-ida-steinberg

7.2 km PM2.5: 15.3 µg/m³

Brossard - secteur du parc Sorbonne, Quebec, Canada

7.6 km PM2.5: 10.3 µg/m³

Brossard - secteur du parc Sorbonne, Quebec, Canada

7.6 km PM2.5: 1.0 µg/m³

St-Dominique, Montreal, Canada

7.7 km PM2.5: 7.2 µg/m³

St-Dominique, Montreal, Canada

7.7 km PM2.5: 5.8 µg/m³

St-Dominique, Montreal, Canada

7.7 km PM2.5: 6.7 µg/m³

St-Dominique, Montreal, Canada

7.7 km PM2.5: 9.8 µg/m³

St-Dominique, Montreal, Canada

7.7 km PM2.5: 7.4 µg/m³

Molson, Montreal, Canada

8.7 km PM2.5: 7.2 µg/m³

Molson, Montreal, Canada

8.7 km PM2.5: 6.5 µg/m³

What cities are near Longueuil?

16 Laflèche 13 Greenfield Park 20 Le Vieux-Longueuil 16 Saint-Hubert 5 Brossard 23 Ville-Marie 18 Ile-des-Soeurs 21 Mercier–Hochelaga-Maisonneuve 20 Boucherville 19 Le Plateau-Mont-Royal

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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-10-21T00:31 UTC.