Smog in Montreal — Live Data: AQI, Fine Dust, Wind, UV and Health Advice

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Latest air quality data: Montreal

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Pollution and air quality forecast for Montréal. Today is Thursday, August 27, 2026. The following air pollution values have been recorded for Montréal:

particulate matter (PM2.5) dust - 11 (Good)
particulate matter (PM10) suspended dust - 11 (Good)
ozone (O3) - 26 (Good)
nitrogen dioxide (NO2) - 45 (Moderate)
sulfur dioxide (SO2) - 6 (Good)
carbon monoxide (CO) - 632 (Good)

Real-time Air Quality Index (AQI) for Montréal, Wednesday, August 26, 2026: 2.

AQI 2 Moderate

What is the air quality in Montréal today? Is the air polluted in Montréal?. Is there smog?

Today (Wednesday, August 26, 2026) air quality is moderate in Montréal. Some pollutants in Montréal may slightly affect very few hypersensitive individuals. Air pollutants in Montréal may cause minor breathing discomfort to sensitive people.

What is the current level of PM2.5 in Montréal? (particulate matter (PM2.5) dust)
Today's PM2.5 level is: 11 (Good) For comparison, the highest level of PM2.5 in Montréal in the last 7 days was: 14 (Friday, August 21, 2026) and the lowest: 7 (Wednesday, August 26, 2026). The highest PM2.5 values were recorded: 11 (February 2020). The lowest level of particulate matter PM2.5 pollution occurs in month: April (3.3).

What is the level of PM10 today in Montréal? (particulate matter (PM10) suspended dust)
The current level of particulate matter PM10 in Montréal is: 11 (Good)

How is the O3 level today in Montréal? (ozone (O3))
26 (Good)

How high is the level of NO2? (nitrogen dioxide (NO2))
45 (Moderate)

What is the level of SO2 pollution? (sulfur dioxide (SO2))
6 (Good)

How high is the CO level? (carbon monoxide (CO))
632 (Good)

Current data Wednesday, August 26, 2026 at 9:00 PM

PM2,5 11 (Good)

PM10 11 (Good)

O3 26 (Good)

NO2 45 (Moderate)

SO2 6 (Good)

CO 632 (Good)

Data on air pollution from recent days in Montréal

index	2026-08-26	2026-08-25	2026-08-24	2026-08-23	2026-08-22	2026-08-21	2026-08-20	2026-08-19
pm25	7 Good	8 Good	7 Good	8 Good	12 Good	14 Moderate	8 Good	9 Good
pm10	7 Good	8 Good	7 Good	8 Good	12 Good	14 Good	8 Good	9 Good
o3	48 Good	47 Good	48 Good	62 Good	63 Good	47 Good	45 Good	55 Good
no2	19 Good	14 Good	13 Good	10 Good	17 Good	28 Good	19 Good	19 Good
so2	5 Good	4 Good	4 Good	3 Good	5 Good	7 Good	4 Good	5 Good
co	286 Good	207 Good	186 Good	168 Good	218 Good	375 Good	233 Good	226 Good

data source »

pollution pm25 hikersbay.com — Air pollution in Montréal from March 2016 to May 2020

index	2020-05	2020-04	2020-03	2020-02	2020-01	2019-12	2019-11	2019-10	2019-09	2019-08	2019-07	2019-06	2019-05	2019-04	2019-03	2019-02	2019-01	2018-12	2018-11	2016-05	2016-04	2016-03
co:ppm	0.16 (Good)	0.17 (Good)	0.22 (Good)	0.28 (Good)	0.27 (Good)	0.23 (Good)	0.22 (Good)	0.23 (Good)	0.21 (Good)	0.2 (Good)	0.21 (Good)	0.19 (Good)	0.19 (Good)	0.2 (Good)	0.25 (Good)	0.25 (Good)	0.25 (Good)	0.27 (Good)	0.23 (Good)	- (Good)	- (Good)	- (Good)
no2:ppm	0 (Good)	0 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	0.01 (Good)	- (Good)	0 (Good)	0.01 (Good)
o3:ppm	0.03 (Good)	0.03 (Good)	0.03 (Good)	0.02 (Good)	0.02 (Good)	0.02 (Good)	0.02 (Good)	0.02 (Good)	0.02 (Good)	0.02 (Good)	0.03 (Good)	0.03 (Good)	0.03 (Good)	0.03 (Good)	0.03 (Good)	0.03 (Good)	0.02 (Good)	0.02 (Good)	0.02 (Good)	0.03 (Good)	0.04 (Good)	0.03 (Good)
pm25	3.5 (Good)	5.3 (Good)	6.9 (Good)	11 (Good)	8.8 (Good)	7.8 (Good)	7.2 (Good)	6.5 (Good)	5.6 (Good)	6 (Good)	9.1 (Good)	6.9 (Good)	5.4 (Good)	5.3 (Good)	8.5 (Good)	8.1 (Good)	8.9 (Good)	9.5 (Good)	7.1 (Good)	- (Good)	3.3 (Good)	6.8 (Good)
so2:ppm	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	0 (Good)	- (Good)	- (Good)	- (Good)

data source »

Quality of life in Montréal

Green and Parks in the City

Montréal 81%

United States: 70% Venezuela: 41% Iceland: 72%

particulate matter PM2.5

Montréal 8 (Good)

Pleasure of spending time in the city

Montréal 81%

United States: 75% The Bahamas: 53% Venezuela: 41% Iceland: 89%

particulate matter PM10

Montréal 15 (Good)

Air Pollution

Montréal 30%

United States: 29% The Bahamas: 52% Venezuela: 59% Iceland: 13%

Garbage Disposal

Montréal 72%

United States: 71% The Bahamas: 29% Venezuela: 18% Iceland: 79%

Availability and quality of drinking water

Montréal 83%

United States: 71% The Bahamas: 55% Venezuela: 28% Iceland: 96%

Cleanliness and tidiness

Montréal 62%

United States: 60% The Bahamas: 35% Venezuela: 22% Iceland: 75%

Noise and Light pollution

Montréal 49%

United States: 47% The Bahamas: 39% Venezuela: 47% Iceland: 23%

Water Pollution

Montréal 36%

United States: 44% The Bahamas: 58% Venezuela: 76% Iceland: 8.4%

Source: Numbeo

Montreal

Wednesday, August 26, 2026 at 9:00 PM

PM2,5 11 (Good)

particulate matter (PM2.5) dust

PM10 11 (Good)

particulate matter (PM10) suspended dust

O3 26 (Good)

ozone (O3)

NO2 45 (Moderate)

nitrogen dioxide (NO2)

SO2 6.4 (Good)

sulfur dioxide (SO2)

CO 632 (Good)

carbon monoxide (CO)

Montreal

index	2026-08-19	2026-08-20	2026-08-21	2026-08-22	2026-08-23	2026-08-24	2026-08-25	2026-08-26
pm25	9.4	8.1	14	12	7.6	7	8	6.8
pm10	9.5	8.2	14	12	7.8	7.1	8.1	6.8
o3	55	45	47	63	62	48	47	48
no2	19	19	28	17	10	13	14	19
so2	4.8	4.4	6.9	5.2	3.4	3.6	4.2	4.8
co	226	233	375	218	168	186	207	286

Aéroport de Montréal

index	2020-05	2020-04	2020-03	2020-02	2020-01	2019-12	2019-11	2019-10	2019-09	2019-08	2019-07	2019-06	2019-05	2019-04	2019-03	2019-02	2019-01	2018-12	2018-11
co:ppm	0.14	0.16	0.2	0.25	0.24	0.2	0.19	0.19	0.18	0.17	0.18	0.16	0.17	0.18	0.22	0.23	0.23	0.25	0.21
no2:ppm	0	0.01	0.01	0.02	0.02	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
o3:ppm	0.03	0.03	0.03	0.02	0.02	0.02	0.02	0.02	0.02	0.03	0.03	0.03	0.03	0.03	0.03	0.03	0.02	0.02	0.02
pm25	3.2	4.7	6.3	11	8.1	6.7	6.9	6	5.3	5.7	8.3	5.7	4.6	4.5	7.4	7.4	8.4	9.5	6.1

Duncan

index	2020-05	2020-04	2020-03	2020-02	2020-01	2019-12	2019-11	2019-10	2019-09	2019-08	2019-07	2019-06	2019-05	2019-04	2019-03	2019-02	2019-01	2018-12	2018-11	2016-05	2016-04	2016-03
o3:ppm	0.03	0.03	0.03	0.02	0.01	0.02	0.02	0.01	0.02	0.02	0.02	0.02	0.02	0.03	0.03	0.02	0.02	0.01	0.01	0.02	0.03	0.02
co:ppm	0.18	0.18	0.23	0.3	0.3	0.25	0.25	0.26	0.25	0.23	0.25	0.23	0.21	0.22	0.27	0.27	0.27	0.29	0.26	-	-	-
no2:ppm	0.01	0.01	0.01	0.02	0.02	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.02	0.02	0.02	0.02	0.02	-	-	-
pm25	5.2	6.8	9.1	15	11	9.7	8.7	8.2	7.5	8.2	12	9.4	7	6.9	12	11	12	12	9.5	-	-	-

Molson

index	2020-05	2020-04	2020-03	2020-02	2020-01	2019-12	2019-11	2019-10	2019-09	2019-08	2019-07	2019-06	2019-05	2019-04	2019-03	2019-02	2019-01	2018-12	2018-11	2016-04	2016-03
pm25	2.6	4	5.6	10	7.9	6.7	5.7	5.1	4.1	4.7	7.3	6.8	4.6	4.5	7.7	7.3	8.2	9.5	6.1	3.3	6.8
o3:ppm	0.03	0.03	0.03	0.02	0.02	0.02	0.02	0.02	0.02	0.02	0.03	0.03	0.03	0.03	0.03	0.03	0.02	0.02	0.02	0.04	0.03
no2:ppm	0	0.01	0.01	0.02	0.02	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0	0.01
so2:ppm	-	0	0	0	-	0	0	0	0	0	0	0	0	0	0	0	0	0	-	-	-

Saint-Jean-Baptiste

index	2020-05	2020-04	2020-03	2020-02	2020-01	2019-12	2019-11	2019-10	2019-09	2019-08	2019-07	2019-06	2019-05	2019-04	2019-03	2019-02	2019-01	2018-12	2018-11	2016-05	2016-04	2016-03
o3:ppm	0.03	0.03	0.03	0.03	0.02	0.02	0.02	0.02	0.02	0.02	0.03	0.03	0.03	0.03	0.03	0.03	0.02	0.02	0.02	0.03	0.03	0.03
no2:ppm	0	0	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	-	-	-
pm25	3.3	5.4	7.2	12	9	8	7.3	6.2	5.6	5.4	8.6	6.3	5.2	5.7	8.4	7.9	9.2	9.7	7.6	-	-	-
so2:ppm	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	-	-	-

Sainte-Anne-de-Belle

index	2020-05	2020-04	2020-03	2020-02	2020-01	2019-12	2019-11	2019-10	2019-09	2019-08	2019-07	2019-06	2019-05	2019-04	2019-03	2019-02	2019-01	2018-12	2018-11	2016-05	2016-04	2016-03
o3:ppm	0.03	0.03	0.03	0.03	0.02	0.02	0.02	0.02	0.02	0.02	0.02	0.03	0.03	0.03	0.04	0.03	0.03	0.02	0.02	0.04	0.04	0.03
no2:ppm	0	0	0.01	0.01	0.01	0.01	0.01	0.01	0	0	0	0	0	0	0.01	0.01	0.01	0.01	0.01	-	-	-
pm25	3.6	6	6.4	10	7.6	7.1	6.3	5.4	4.3	5.1	7.5	4	3.6	3.6	6.8	7	7.2	8.1	5.7	-	-	-
so2:ppm	-	0	0	0	0	0	0	0	-	0	-	0	-	-	0	0	0	0	-	-	-	-

St-Dominique

index	2020-05	2020-04	2020-03	2020-02	2020-01	2019-12	2019-11	2019-10	2019-09	2019-08	2019-07	2019-06	2019-05	2019-04	2019-03	2019-02	2019-01	2018-12	2018-11
pm25	3.6	5.2	6.3	10	8.3	7.5	6.7	6.2	5.8	5.8	8.1	6	5.3	5.4	8	7.5	8.3	8.8	7.4

York-Roberval

index	2020-05	2020-04	2020-03	2020-02	2020-01	2019-12	2019-11	2019-10	2019-09	2019-08	2019-07	2019-06	2019-05	2019-04	2019-03	2019-02	2019-01	2018-12	2018-11
pm25	2.8	5	7.4	12	9.7	8.8	9.1	8.2	6.8	7.1	12	10	7.5	6.2	9	8.8	9.3	8.9	7.5

* Pollution data source: https://openaq.org (AirNow) The data is licensed under CC-By 4.0

🌦️ Weather · 16-day Forecast — Montreal

16-day weather forecast for Montreal: today around 22°C (rain), lows near 15°C. Daily temperature and conditions, updated every day. A moderate breeze (about 14 km/h) is partially dispersing pollutants today.

☀️ UV Index · 16-day Forecast — Montreal

The UV index in Montreal today is 6.3 (high) — unprotected fair skin can burn in about 30 minutes.

📍 Air quality in nearby cities

Live PM2.5 around Montreal — compare nearby locations.

Ottawa 6 µg/m³
Oshawa 3 µg/m³
Markham 5 µg/m³
Toronto 7 µg/m³
Vancouver 10 µg/m³
Calgary 8 µg/m³
Edmonton 7 µg/m³
Mississauga 7 µg/m³

Frequently asked questions

Is the air safe to breathe in Montréal today?

The current average PM2.5 across Montréal is about 11 µg/m³, rated “Good”. Air quality is good — outdoor activities are fine for everyone.

What is the current PM2.5 level in Montréal?

Right now PM2.5 in Montréal averages about 11 µg/m³ (“Good”). PM2.5 are fine particles small enough to reach the lungs and bloodstream.

Which day last week had the worst air in Montréal?

Over the past week, the highest daily PM2.5 in Montréal was recorded on Friday, August 21 (about 14 µg/m³).

What is the UV index in Montréal today?

The UV index in Montréal today is 6.3 (high) — unprotected fair skin can burn in about 30 minutes.

Does today's wind help disperse smog in Montréal?

A moderate breeze (about 14 km/h) is partially dispersing pollutants today.

How is air quality measured?

Air quality here is based on PM2.5 — the concentration of fine particulate matter in µg/m³. Lower values mean cleaner air. Data is updated daily from Open-Meteo.