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Longueuil Air Quality Index (AQI) | Air Pollution

Real-time PM2.5, PM10 air pollution level in Quebec

Last Updated: 2025-08-05 12:25:24 AM (Local Time)

location image
Live AQI
73(AQI-US)
Air Quality is
Moderate
pm10 :  59 µg/m³
PM2.5 :  21 µg/m³
Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+
aqi moderate level.webp in Longueuil
cloudy

18 °C

Cloudy
Humidity
Humidity83 %

Wind Speed
Wind Speed8 km/h

UV Index
UV Index0
Last Updated: 2025-08-05 12:25:24 AM (Local Time)


Map

Longueuil

Major Air Pollutants

Longueuil

AQI Graph

Historical Air Quality Data

Longueuil

Longueuil
AQI
.
04-08-2025Time05-08-2025
51
Min.at 4:10 AM on 4th Aug
125
Max.at 2:10 PM on 4th Aug

Download 2024 Annual Data

World Air Quality Report

Globe

AQI Trends - Annual Air Quality Changes

Longueuil, Quebec, Canada

Year
.
AQI


Annual AQI Trends

2020
25AQI
2021
32AQI
28%
Rise
2022
33AQI
3%
Rise
2023
36AQI
9%
Rise
2024
31AQI
-14%
Fall
2025
32AQI
3%
Rise
Overall Annual Percentage (%) change of AQI in (2020 to 2025)
6%
Rise (Worsened AQI)

Most & Least Polluted Months

Most PollutedJune, 202354AQI

Least PollutedOctober, 202021AQI

* This data analysis is from year 2020 - 2025

Longueuil's Locations

Real-time Air Pollution Level

Location
Status
AQI
PM2.5(µg/m³)
PM10(µg/m³)
Temp.(°C)
Humi.(%)
Moderate
68
18
59
19
87
Moderate
76
23
59
19
87
Moderate
76
23
59
19
87
Moderate
71
20
59
19
87
Moderate
69
19
59
19
89
Moderate
77
23
59
19
87

Canada's Metro Cities

Air Quality Index

Health Advice For People Living In

Longueuil

1Cigarettes per day

Cigarette
Weekly 7 Cigarettes
Monthly 30 Cigarettes

Breathing the air in this location is as harmful as smoking 1 cigarettes a day.

Source:

Berkeley Earth

Disclaimer: This cigarette-equivalent estimate is based on the average PM2.5 concentration over the last 24 hours, assuming continuous exposure during that time.

Solutions for Current AQI

  • Air Purifier
    Air PurifierTurn On
  • Car Filter
    Car FilterMust
  • N95 Mask
    N95 MaskMust
  • Stay Indoor
    Stay IndoorMust


Must turn on the air purifier to enjoy fresh air.

Get an Air Purifier

Prevent Health Problems: Understand Your Risks

Longueuil

  • asthma due to air pollution in LongueuilAsthma
  • heart due to air pollution in LongueuilHeart Issues
  • allergy due to air pollution in LongueuilAllergies
  • sinus due to air pollution in LongueuilSinus
  • flu due to air pollution in LongueuilCold/Flu
  • copd due to air pollution in LongueuilChronic (COPD)
asthma due to air pollution in Longueuil

Mild Chances of Asthma

Asthma

Risk of Asthma symptoms is Mild when AQI is Moderate (50-150)

Moderate symptoms including frequent wheezing, noticeable shortness of breath, chest tightness, and persistent cough.

Do's :

  • Limit outdoor activities when AQI is poor.

  • Clean indoor air with an air purifier to reduce exposure.

  • Soothe the respiratory tract with herbal teas or warm water to help alleviate symptoms.

Don'ts :

  • Exercise outdoors without a mask.

  • Stay in smoky areas with strong fumes.

Disclaimer: The above health risks are precautionary suggestions based on current AQI levels. You may not feel the effects immediately, but prolonged exposure to air pollution can contribute to these health conditions over time. AQI.IN is neither a medical expert nor a provider of medical advice. Please consult a doctor if you experience any of the above similar symptoms.

Most Polluted Cities 2025

Canada

Analyze the real-time most air polluted cities in the country.

Longueuil's AQI Data Analytics Solutions

Air quality data monitoring platforms

Mobile AppMobile App
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WidgetsWidgets
aqi air quality app for Longueuil
Mobile App

Empower Your Decisions with Reliable Data

Your area’s real-time data with detailed parameters.

Your area’s real-time data with detailed parameters.


Personalized health advice as per current AQI.

Personalized health advice as per current AQI.


Analytical data to identify trends and conditions.

Analytical data to identify trends and conditions.


Connect and control your air quality devices.

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Air Quality FAQs

at Longueuil

Frequently Asked Questions About Air Quality

What is the current AQI level in Longueuil?

The current real-time AQI level in Longueuil is 73 (Moderate). This was last updated 2025-08-05 12:25:24 AM (Local Time).

When was the best AQI level in Longueuil in the last 24 hours?

The best AQI level was 51 (Moderate) at 4:10 AM, Aug 4, 2025 (Local Time) during the last 24 hours.

When was the worst AQI level in Longueuil in the last 24 hours?

The worst AQI level was 125 (Poor) at 2:10 PM, Aug 4, 2025 (Local Time) during the last 24 hours.

What is the current trend of AQI levels in Longueuil during last 24 hours?

The AQI levels in Longueuil have been fluctuating throughout the last 24 hours. The levels have increased by highest 125 at 2:10 PM, Aug 4, 2025 (Local Time), lowest 51 at 4:10 AM, Aug 4, 2025 (Local Time).

What actions are recommended as per the current AQI level in Longueuil?

Current AQI levels are acceptable; however, some pollutants may be a concern for a small number of sensitive individuals.