City report · Quebec, Canada
Montréal Air quality today
Air quality in Montréal currently reads AQI 14 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 14
Good
- PM2.5, fine particles (µg/m³)
- 2.5
- tree cover
- 44.4%
- trees in this area
- 139K
- more trees needed
- 0
Measured across a 2 km radius around Ville-Marie, Montreal, QC, Canada (12.57 km²), from a satellite image of Sep 11, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Montréal · AQI 14 (Good)
Montréal's tree count comes to 139,208 trees across 12.54 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Montréal today: AQI 14, Good
Main pollutant: PM2.5 · Observed Nov 11, 09:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Molson, 4 km away · median of 3 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
2.5
PM10
—
NO₂
9.6
O₃
29.4
SO₂
0.0
CO
—
Data: OpenAQ · AirNow
- Outdoor exercise
- A good day to be active outside
- Windows
- Open them to air the house
- Mask
- Not needed
- Air purifier
- Not needed
Over the last 7 days, the CAMS air-quality model put Montréal's daily AQI at 36 on average, from 9 on Nov 11 to an hourly peak of 71 on Nov 10.
This is the US EPA AQI. How it differs from Canada's AQHI
Where Montréal stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Montréal: Healthy tree cover
44.4% tree cover against a 30% healthy-neighborhood target, across 12.54 km² of land.
Trees in this area
139,208
Target trees
139,208
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Montréal lost?
Since 2001, the area within 10 km of Montréal has lost about 23 hectares of forest (about 32 football pitches): 1.4% of the forest it had in 2000. Most of it (77%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from September 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 23 haabout 32 football pitches
- Share of its forest
- 1.4%of what there was in 2000
- Cleared for good
- 18 hadeforestation: turned into farms, mines or towns
The worst year was 2004, when about 5 hectares of forest were lost.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 2 ha | under 1 ha | 2 ha |
| 2002 | 2 ha | under 1 ha | 2 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 4 ha | under 1 ha | 5 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | 4 ha | under 1 ha | 4 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | 1 ha | 1 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | 3 ha | under 1 ha | 3 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Montréal?
- Towns and roadscleared for good76% · 18 ha
- Unknown causescause unknown24% · 6 ha
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
Forest gained and lost, 2000–2020
- Forest in 2000
- 7,540 ha
- Forest in 2020
- 7,790 ha
- Overall change
- +255 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Montréal grew from about 7,540 hectares to 7,790 hectares, a net gain of about 255 hectares (+3.4%). New forest grew on about 285 hectares, while 31 hectares were lost.
These 2000 and 2020 maps, from the University of Maryland, count any land with trees taller than 5 m as forest, including plantations and orchards. Forest that was cut or burned and had grown back by 2020 counts in both years, so the loss here is smaller than the yearly figures.
These figures cover everything within 10 km of the city center, a wider area than the report above, because forest is usually lost at a city's edges.
Source: Hansen/UMD/Google/USGS/NASA, Global Forest Change (GFC-2025-v1.13); causes: WRI/Google DeepMind drivers of forest loss; both CC BY 4.0, summed by Airleaf for each area. Forest gained and lost 2000–2020: Potapov et al. 2022, UMD GLAD Global Land Cover and Land Use Change, CC BY 4.0. Images: contains modified Copernicus Sentinel data. How it's measured
In the same region
Measured cities near Montréal
Same 2 km radius, same index — so they compare directly.
- Terrebonne21.8 km
Canada
- Tree cover
- 33%
- Air quality
- 14
- 26.5 km
- Tree cover
- 68%
- Air quality
- 14
- Trois-Rivières123.0 km
Canada
- Tree cover
- 25%
- Air quality
- 11
- Sherbrooke132.3 km
Canada
- Tree cover
- 40%
- Air quality
- 19
- Orléans149.5 km
Canada
- Tree cover
- 27%
- Air quality
- 17
Also compared:Montréal vs TorontoMontréal vs VancouverMontréal vs OttawaMontréal vs Calgary
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Frequently asked
Questions about Montréal
What is the air quality (AQI) in Montréal right now?
The latest reading for Montréal shows an AQI of 14 (Good), measured Nov 11, 09:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Molson, 4 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Montréal today?
At AQI 14 (Good): a good day to be active outside. Windows: open them to air the house. Masks: not needed. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Montréal been like this week?
Over the last 7 days, the CAMS air-quality model put Montréal's daily AQI at 36 on average, from 9 on Nov 11 to an hourly peak of 71 on Nov 10. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
Is Montréal's AQI the same as Canada's AQHI?
No. Airleaf shows the US EPA Air Quality Index (AQI), the scale used by IQAir and most air-quality apps. Canada's Air Quality Health Index (AQHI), from Environment and Climate Change Canada, runs from 1 to 10 and above: 1–3 low risk, 4–6 moderate, 7–10 high and over 10 very high. It combines ozone, nitrogen dioxide and fine particles into one health-risk number, so it isn't a converted AQI, and the two can move differently, especially in wildfire smoke.
How much forest has the area around Montréal lost since 2001?
Since 2001, the area within 10 km of Montréal has lost about 23 hectares of forest (about 32 football pitches): 1.4% of the forest it had in 2000. Most of it (77%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Montréal grew from about 7,540 hectares to 7,790 hectares, a net gain of about 255 hectares (+3.4%). New forest grew on about 285 hectares, while 31 hectares were lost.
What is the tree count in Montréal?
Montréal has an estimated 139,208 trees across the 12.54 km² of land measured — 44.4% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Montréal need?
Montréal has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Montréal's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Ville-Marie, via OpenAQ; the 7-day trend is the Open-Meteo / CAMS model's estimate. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 2 km radius around Ville-Marie; the tree count is an estimate derived from that cover.
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