Air Quality in Longueuil, Canada

Clear
26.5°C · 43.8% humidity
26.5°
Feels 26.5°
72
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
62 10am
72
78
72 1pm
69
68
66 4pm
65
65
64 7pm
64
57
56 10pm
56
54
54 1am
54
54
53 4am
53
53
53 7am
53
53
Station readings
62
72
78
CAMS model adj +29
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 · 3 stn

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 Longueuil is 1.5× 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▲
72
21.91 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Longueuil?

Temperature & Precipitation

PM2.5 Trend

47h · 3 stations
PM2.521.91 µg/m³ ×1.5 WHO
Moderate
PM1020.55 µg/m³
Good
UV INDEX14.9
Extreme
AD 300×250
Station readings (2 stations within 25 km)
21.91
Median
24.52
Average
20.7
Low
28.33
High
PM2.5 µg/m³ · Model: 13.7 · Bias: -8.2

What is the 7-day forecast for 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: 2.4°C

Where are air quality stations near Longueuil?

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

What cities are near Longueuil?

71 Laflèche 71 Greenfield Park 70 Le Vieux-Longueuil 70 Saint-Hubert 70 Brossard 75 Ville-Marie 73 Ile-des-Soeurs 70 Mercier–Hochelaga-Maisonneuve 72 Boucherville 74 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 2026-07-21T17:20 UTC.