Air Quality in Le Vieux-Longueuil, Canada

Clear
26.5°C · 43.8% humidity
26.5°
Feels 26.5°
70
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
60 10am
70
80
70 1pm
68
67
66 4pm
66
65
65 7pm
65
57
57 10pm
57
55
55 1am
55
55
54 4am
54
54
54 7am
54
54
Station readings
60
70
80
CAMS model adj +30
27
27
34
34
34
34
34
34
34
34
34
27
27
27
25
25
25
25
24
24
24
24
24
24
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 1.4× the WHO 24-hour guideline of 15 µg/m³.

43.8%
Humidity
37.8 km/h
Wind ENE
1015.4 hPa
Pressure
14.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
70
21.16 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Le Vieux-Longueuil?

Temperature & Precipitation

PM2.5 Trend

47h · 2 stations
PM2.521.16 µg/m³ ×1.4 WHO
Moderate
PM1020.55 µg/m³
Good
UV INDEX14.9
Extreme
AD 300×250
Station readings (2 stations within 25 km)
21.16
Median
24.52
Average
20.7
Low
28.33
High
PM2.5 µg/m³ · Model: 13.7 · Bias: -7.5

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

07-21
26.5° 20.8°
07-22
25.3° 18.2°
0.19 mm
07-23
20.5° 13.5°
5.75 mm
07-24
23.6° 14.5°
1.13 mm
07-25
20.5° 18.6°
12.81 mm
07-26
22.8° 16.0°
7.56 mm
07-27
27.8° 18.4°
0.88 mm
Both models agree Avg diff: 2.6°C

Where are air quality stations near Le Vieux-Longueuil?

–
canada-montreal-rue-leclaire
2.6 km PM2.5: 0.0 µg/m³
80
canada-montreal-rue-ida-steinberg
3.3 km PM2.5: 25.9 µg/m³
25
Montreal
4.8 km PM2.5: 6.0 µg/m³
53
Montreal
4.8 km PM2.5: 13.1 µg/m³
40
Montreal
4.8 km PM2.5: 9.6 µg/m³
40
Montreal
4.8 km PM2.5: 9.6 µg/m³
132
Longueuil - secteur du parc Océanie (Brossard), Quebec, Canada
11.0 km PM2.5: 48.1 µg/m³
193
Longueuil - secteur du parc Océanie (Brossard), Quebec, Canada
11.0 km PM2.5: 136.8 µg/m³
37
Longueuil - secteur du parc Océanie (Brossard), Quebec, Canada
11.0 km PM2.5: 8.9 µg/m³
24
Longueuil - secteur du parc Océanie (Brossard), Quebec, Canada
11.0 km PM2.5: 5.8 µg/m³

What cities are near Le Vieux-Longueuil?

72 Longueuil 70 Mercier–Hochelaga-Maisonneuve 71 Laflèche 74 Le Plateau-Mont-Royal 75 Ville-Marie 71 Greenfield Park 76 Montréal 76 Mile End 78 Rosemont–La Petite-Patrie 78 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 2026-07-21T17:27 UTC.