Air Quality in Longueuil, Canada

Windy
19.6°C · 45.4% humidity
19.6°
Feels 19.6°
63
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
63 4pm
60
62
63 7pm
70
70
70 10pm
70
70
70 1am
70
70
70 4am
70
70
70 7am
70
63
63 10am
63
63
61 1pm
61
61
Station readings
63
60
62
CAMS model adj +36
27
25
25
27
34
34
34
34
34
34
34
34
34
34
34
34
34
27
27
27
27
25
25
25
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 1.2× 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▲
63
17.84 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Longueuil?

Temperature & Precipitation

PM2.5 Trend

47h · 3 stations
PM2.517.84 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)
17.84
Median
17.09
Average
16.0
Low
18.18
High
PM2.5 µg/m³ · Model: 7.1 · Bias: -10.7

What is the 7-day forecast for 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: 3.4°C

Where are air quality stations near Longueuil?

–
canada-montreal-rue-leclaire
6.6 km PM2.5: 0.0 µg/m³
45
Montreal
6.7 km PM2.5: 10.8 µg/m³
54
Montreal
6.7 km PM2.5: 13.5 µg/m³
35
Montreal
6.7 km PM2.5: 8.4 µg/m³
55
Montreal
6.7 km PM2.5: 14.0 µg/m³
37
Montreal
6.7 km PM2.5: 8.9 µg/m³
29
Montreal
6.7 km PM2.5: 7.0 µg/m³
45
Montreal
6.7 km PM2.5: 10.8 µg/m³
55
Montreal
6.7 km PM2.5: 14.0 µg/m³
55
Montreal
6.7 km PM2.5: 14.0 µg/m³

What cities are near Longueuil?

62 Laflèche 61 Greenfield Park 64 Le Vieux-Longueuil 61 Saint-Hubert 59 Brossard 62 Ville-Marie 61 Ile-des-Soeurs 64 Mercier–Hochelaga-Maisonneuve 63 Boucherville 62 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 2026-08-07T23:46 UTC.