Air quality comparison · Canada, 15 km apart
Montréal vs Rivière-des-Prairies–Pointe-aux-Trembles Air quality index (AQI) today
Montréal and Rivière-des-Prairies–Pointe-aux-Trembles are level right now: both read AQI 17 (Good).
Over the past 6 days, on modeled daily averages, Montréal averaged AQI 40 against 41, and it was the cleaner of the two on 1 of those days. Rivière-des-Prairies–Pointe-aux-Trembles has lost more forest since 2001. Montréal has more tree cover.
Canada
AQI 17
Good
Cleaner right now
- PM2.5
- 2.3 µg/m³
- Main pollutant
- Ozone
- Source
- Ground station
- Reading
- Nov 11, 10:00 local
Canada
AQI 17
Good
Cleaner right now
- PM2.5
- 3.1 µg/m³
- Main pollutant
- PM2.5
- Source
- Ground station
- Reading
- Nov 11, 10:00 local
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Montréal17Rivière-des-Prairies–Pointe-aux-Trembles17
Head to head
Montréal vs Rivière-des-Prairies–Pointe-aux-Trembles at a glance
Montréal is ahead on 5 of 6 measures, and Rivière-des-Prairies–Pointe-aux-Trembles on 0. The better figure in each row is marked.
| Montréal | Rivière-des-Prairies–Pointe-aux-Trembles | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 17 | 17 |
| PM2.5Fine particles, µg/m³. | 2.3 (better) | 3.1 |
| Past week's averageUS AQI, 6 days. | 40 (better) | 41 |
| Forest lost since 2001Within 10 km of the center. | 23 ha (better) | 214 ha |
| Tree coverWithin 2 km of the center. | 44.4% (better) | 26.3% |
| Trees still neededTo reach a healthy canopy. | 0 (better) | 9.8K |
Air quality today
What is the air like in Montréal and Rivière-des-Prairies–Pointe-aux-Trembles right now?
Montréal and Rivière-des-Prairies–Pointe-aux-Trembles are level right now: both read AQI 17 (Good). Ozone is setting the index in Montréal, and PM2.5 in Rivière-des-Prairies–Pointe-aux-Trembles.
Both readings come from nearby ground stations.
MontréalRivière-des-Prairies–Pointe-aux-Trembles
Concentrations at the same moment as the index above, for the pollutants both places report. Lower is better. The dark marks on the PM2.5 and PM10 rows show the WHO's 24-hour guidelines (15 and 45 µg/m³).
The past week
Which had cleaner air over the past 6 days?
Over the past 6 days, on modeled daily averages, Montréal averaged AQI 40 against 41, and it was the cleaner of the two on 1 of those days. A single reading can catch a city on a bad afternoon; the week says whether it was the weather or the place.
- Cleaner days
- Montréal1Rivière-des-Prairies–Pointe-aux-Trembles0
- Average AQI
- Montréal40Rivière-des-Prairies–Pointe-aux-Trembles41
- Worst day, AQI
- Montréal51Rivière-des-Prairies–Pointe-aux-Trembles56
The daily numbers (6 days)
| Day | Montréal | Rivière-des-Prairies–Pointe-aux-Trembles |
|---|---|---|
| Nov 5 | 33 | 33 |
| Nov 6 | 43 | 43 |
| Nov 7 | 45 | 45 |
| Nov 8 | 31 | 31 |
| Nov 9 | 38 | 38 |
| Nov 10 | 51 | 56 |
Daily averages from the CAMS atmospheric model for both places, so the week compares like with like. They can differ from today's reading at the top of the page wherever that comes from a ground station.
What it means today
Is it safe to go outside in Montréal and Rivière-des-Prairies–Pointe-aux-Trembles today?
Air quality is satisfactory for everyone. Both are in the same EPA band today (Good), so the advice is the same.
Exercise outdoors
A good day to be active outside.
Windows
Open them to air the house.
Masks
Not needed.
Air purifier
Not needed.
Against everywhere else
How do Montréal and Rivière-des-Prairies–Pointe-aux-Trembles compare with the rest of the world?
Right now Montréal's air is cleaner than 90% of the 5,420 places Airleaf tracks, and Rivière-des-Prairies–Pointe-aux-Trembles's is cleaner than 90%. Within Canada, that is 79% and 79% of its 59 measured places.
Cleaner air than…
- Montréal
- Beats 90%
- Rivière-des-Prairies–Pointe-aux-Trembles
- Beats 90%
More tree cover than…
- Montréal
- Beats 88%
- Rivière-des-Prairies–Pointe-aux-Trembles
- Beats 60%
Includes model estimates as well as station readings, so it can differ from our most polluted and cleanest air rankings, which use station readings only.
Deforestation · 2001–2025
Which has lost more forest, Montréal or Rivière-des-Prairies–Pointe-aux-Trembles?
Rivière-des-Prairies–Pointe-aux-Trembles has lost more: about 214 ha of forest within 10 km of its center from 2001 to 2025, against 23 ha around Montréal. 188 ha of that was cleared for good, for farms, mines or towns.
Measured within 10 km of each center, from the yearly satellite maps of forest loss: a wider circle than the one for tree cover, because forest is usually lost at a city's edges.
Worst year: 2004, with 5 ha lost.
Worst year: 2010, with 32 ha lost.
| Montréal | Rivière-des-Prairies–Pointe-aux-Trembles | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 23 ha (better) | 214 ha |
| Share of its forestOf what it had in 2000. | 1.4% (better) | 5.9% |
| Cleared for goodTurned into farms, mines or towns. | 18 ha (better) | 188 ha |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Towns and roads (76%) | Towns and roads (86%) |
Satellite timelapses
Watch both change, year by year
A clear satellite photo a year of the land around each city. Press play, turn on the forest cleared since the first year, or drag the before and after.
Montréal
2017: satellite photo from September 2017 of a 5 × 5 km area in the city center.
Rivière-des-Prairies–Pointe-aux-Trembles
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km north of the city center.
Trees
Which has more trees, Montréal or Rivière-des-Prairies–Pointe-aux-Trembles?
Montréal has more tree cover: 44.4% of the land within 2 km of its center against 26.3% around Rivière-des-Prairies–Pointe-aux-Trembles, or about 139,208 trees against 69,652.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Montréal | Rivière-des-Prairies–Pointe-aux-Trembles | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 139K (better) | 69.7K |
| Trees still neededTo reach the target. Fewer is better. | 0 (better) | 9.8K |
| CO₂ absorbed each yearBy the trees already standing. | 3.1M kg (better) | 1.5M kg |
Tree cover on the satellite image
The same 2 km radius around each center, with the tree cover the satellite found marked on it.
Reading these numbers
How this comparison is made
Air quality index
The US EPA index, computed from current pollutant concentrations: ground stations where a place has them nearby, and the CAMS atmospheric model everywhere else. It moves hour to hour, so it is a snapshot rather than a verdict on either place. The guideline marks are from the WHO's 2021 air quality guidelines.
Trees and forest
Tree cover is the share of ground under canopy within 2 km of each center, read from Sentinel-2 satellite imagery at 10 m detail. It measures that circle, not the whole municipality, which is what makes the two comparable. Forest loss comes from the University of Maryland's Global Forest Change maps.
More on the method on the About Airleaf page.
Frequently asked
Montréal vs Rivière-des-Prairies–Pointe-aux-Trembles: your questions answered
Is Montréal cleaner than Rivière-des-Prairies–Pointe-aux-Trembles?
On air quality they are level right now: both read 17 on the US EPA index. Air quality changes through the day, so this can separate within hours. Over the past 6 days, on modeled daily averages, Montréal averaged AQI 40 against 41, and it was the cleaner of the two on 1 of those days.
Is it safe to exercise outdoors in Montréal and Rivière-des-Prairies–Pointe-aux-Trembles today?
The advice is the same for both today. Air quality is satisfactory for everyone. Montréal reads AQI 17 and Rivière-des-Prairies–Pointe-aux-Trembles reads AQI 17.
Which has lost more forest, Montréal or Rivière-des-Prairies–Pointe-aux-Trembles?
Rivière-des-Prairies–Pointe-aux-Trembles has lost more: about 214 ha of forest within 10 km of its center from 2001 to 2025, against 23 ha around Montréal. 188 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Montréal or Rivière-des-Prairies–Pointe-aux-Trembles?
Montréal has more tree cover: 44.4% of the land within 2 km of its center against 26.3% around Rivière-des-Prairies–Pointe-aux-Trembles, or about 139,208 trees against 69,652. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Montréal and Rivière-des-Prairies–Pointe-aux-Trembles need?
Montréal needs about 0 more to reach its canopy target of 30%, and Rivière-des-Prairies–Pointe-aux-Trembles about 9,799 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Why can two places 15 km apart read differently?
Air changes over short distances with traffic, industry, wind and hills, and each reading comes from the nearest ground stations or, where there are none, from a regional model. A gap of a few points between neighbors is within normal variation, while a gap that crosses an EPA band is worth noticing.
Are Montréal and Rivière-des-Prairies–Pointe-aux-Trembles measured the same way?
The method is the same: the US EPA index for air, and Sentinel-2 satellite imagery at 10 m detail over an identical radius for trees. Both readings come from nearby ground stations. Nothing is adjusted for population, city limits or climate.
How often does the Montréal vs Rivière-des-Prairies–Pointe-aux-Trembles comparison update?
The air readings refresh about once an hour, and each reading's local time is shown at the top of the page. Tree cover comes from the latest clear satellite image of each area (Sep 11, 2026 and Sep 11, 2026), and the forest figures are published yearly.
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