Air Quality in Le Vieux-Longueuil, Canada

Windy
19.6°C · 45.4% humidity
19.6°
Feels 19.6°
64
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
73 8pm
72
74
64 11pm
67
68
70 2am
71
71
72 5am
72
72
73 8am
66
66
66 11am
66
64
64 2pm
64
64
64 5pm
64
64
Station readings
73
72
74
CAMS model adj +39
34
34
34
34
34
34
34
34
34
34
34
34
34
27
27
27
27
25
25
25
25
25
25
25
AD 728×90

Air Quality Index Trend

47h · 2 stn

Le Vieux-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. Current PM2.5 concentration in Le Vieux-Longueuil is 1.2× the WHO 24-hour guideline of 15 µg/m³.

45.4%
Humidity
59.0 km/h
Wind WSW
1011.0 hPa
Pressure
2.2
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
64
18.05 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Le Vieux-Longueuil?

Temperature & Precipitation

PM2.5 Trend

47h · 2 stations
PM2.518.05 µg/m³ ×1.2 WHO
Moderate
PM1013.7 µg/m³
Good
UV INDEX2.2
Moderate
AD 300×250
Station readings (2 stations within 25 km)
18.05
Median
17.09
Average
16.0
Low
18.18
High
PM2.5 µg/m³ · Model: 6.25 · Bias: -11.8

What is the 7-day forecast for Le Vieux-Longueuil?

08-03
24.8° 15.9°
08-04
29.4° 17.3°
1.69 mm
08-05
28.6° 16.2°
0.75 mm
08-06
27.6° 19.2°
1.75 mm
08-07
25.1° 15.7°
1.88 mm
08-08
25.4° 18.2°
08-09
32.2° 19.1°
0.62 mm
Both models agree Avg diff: 4.0°C

Where are air quality stations near Le Vieux-Longueuil?

–
canada-montreal-rue-leclaire
2.6 km PM2.5: 0.0 µg/m³
75
canada-montreal-rue-ida-steinberg
3.3 km PM2.5: 23.3 µg/m³
20
Montreal
4.8 km PM2.5: 4.8 µg/m³
55
Montreal
4.8 km PM2.5: 14.0 µg/m³
55
Montreal
4.8 km PM2.5: 14.0 µg/m³
45
Montreal
4.8 km PM2.5: 10.8 µg/m³
45
Montreal
4.8 km PM2.5: 10.8 µg/m³
54
Montreal
4.8 km PM2.5: 13.5 µg/m³
35
Montreal
4.8 km PM2.5: 8.4 µg/m³
29
Montreal
4.8 km PM2.5: 7.0 µg/m³

What cities are near Le Vieux-Longueuil?

63 Longueuil 64 Mercier–Hochelaga-Maisonneuve 62 Laflèche 62 Le Plateau-Mont-Royal 62 Ville-Marie 61 Greenfield Park 62 Montréal 62 Mile End 61 Rosemont–La Petite-Patrie 61 Villeray–Saint-Michel–Parc-Extension
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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 2026-08-08T03:28 UTC.