City report · Quebec, Canada
Saint-Louis-de-Terrebonne Air quality today
Air quality in Saint-Louis-de-Terrebonne currently reads AQI 19 (Good): Air quality is satisfactory for everyone.
AQI 19
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 2.4
- tree cover
- 68.1%
- trees in this area
- 214K
- more trees needed
- 0
Measured across a 2 km radius around Terrebonne, 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.
Saint-Louis-de-Terrebonne · AQI 19 (Good)
Saint-Louis-de-Terrebonne's tree count comes to 213,942 trees across 12.57 km², already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Saint-Louis-de-Terrebonne today: AQI 19, Good
Main pollutant: Ozone · Observed Nov 11, 11:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Saint-Jean-Baptiste, 23.3 km away · median of 3 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
2.4
PM10
—
NO₂
4.1
O₃
39.3
SO₂
2.6
CO
114.6
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 Saint-Louis-de-Terrebonne's daily AQI at 39 on average, from 30 on Nov 4 to an hourly peak of 57 on Nov 10.
This is the US EPA AQI. How it differs from Canada's AQHI
Where Saint-Louis-de-Terrebonne stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Saint-Louis-de-Terrebonne: Healthy tree cover
68.1% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
213,942
Target trees
213,942
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Saint-Louis-de-Terrebonne lost?
Since 2001, the area within 10 km of Saint-Louis-de-Terrebonne has lost about 1,300 hectares of forest (about 1,800 football pitches): 12% of the forest it had in 2000. Most of it (95%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area about 2 km west of the city center.
- Forest lost since 2001
- 1,300 haabout 1,800 football pitches
- Share of its forest
- 12%of what there was in 2000
- Cleared for good
- 1,240 hadeforestation: turned into farms, mines or towns
The worst year was 2004, when about 211 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 | 61 ha | under 1 ha | 61 ha |
| 2002 | 124 ha | under 1 ha | 124 ha |
| 2003 | 88 ha | under 1 ha | 89 ha |
| 2004 | 207 ha | 4 ha | 211 ha |
| 2005 | 113 ha | 1 ha | 114 ha |
| 2006 | 56 ha | 1 ha | 58 ha |
| 2007 | 73 ha | 2 ha | 75 ha |
| 2008 | 41 ha | under 1 ha | 42 ha |
| 2009 | 57 ha | 5 ha | 62 ha |
| 2010 | 31 ha | 3 ha | 33 ha |
| 2011 | 39 ha | under 1 ha | 39 ha |
| 2012 | 54 ha | 1 ha | 55 ha |
| 2013 | 12 ha | under 1 ha | 12 ha |
| 2014 | 28 ha | under 1 ha | 29 ha |
| 2015 | 19 ha | 2 ha | 21 ha |
| 2016 | 48 ha | 2 ha | 49 ha |
| 2017 | 27 ha | under 1 ha | 28 ha |
| 2018 | 22 ha | 2 ha | 24 ha |
| 2019 | 18 ha | 1 ha | 19 ha |
| 2020 | 15 ha | 1 ha | 16 ha |
| 2021 | 29 ha | 13 ha | 42 ha |
| 2022 | 40 ha | 8 ha | 48 ha |
| 2023 | 7 ha | under 1 ha | 7 ha |
| 2024 | 20 ha | 2 ha | 22 ha |
| 2025 | 12 ha | 10 ha | 22 ha |
What is causing deforestation around Saint-Louis-de-Terrebonne?
- Towns and roadscleared for good76% · 991 ha
- Farms, pasture and plantationscleared for good14% · 183 ha
- Mining and energycleared for good5% · 65 ha
Also: logging, storms, floods and other natural causes, unknown causes.
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
- 14,900 ha
- Forest in 2020
- 15,200 ha
- Overall change
- +303 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Saint-Louis-de-Terrebonne stayed about the same size, at about 15,200 hectares: new forest grew on about 947 hectares, and about 644 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 Saint-Louis-de-Terrebonne
Same 2 km radius, same index — so they compare directly.
- Laval16.4 km
Canada
- Tree cover
- 31%
- Air quality
- 19
- 17.1 km
- Tree cover
- 26%
- Air quality
- 19
- Montréal26.5 km
Canada
- Tree cover
- 44%
- Air quality
- 19
- Longueuil32.3 km
Canada
- Tree cover
- 29%
- Air quality
- 20
- Trois-Rivières119.4 km
Canada
- Tree cover
- 25%
- Air quality
- 19
- Orléans136.4 km
Canada
- Tree cover
- 27%
- Air quality
- 19
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Frequently asked
Questions about Saint-Louis-de-Terrebonne
What is the air quality (AQI) in Saint-Louis-de-Terrebonne right now?
The latest reading for Saint-Louis-de-Terrebonne shows an AQI of 19 (Good), measured Nov 11, 11:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Saint-Jean-Baptiste, 23.3 km away). The main pollutant is Ozone. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Saint-Louis-de-Terrebonne today?
At AQI 19 (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 Saint-Louis-de-Terrebonne been like this week?
Over the last 7 days, the CAMS air-quality model put Saint-Louis-de-Terrebonne's daily AQI at 39 on average, from 30 on Nov 4 to an hourly peak of 57 on Nov 10. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
Is Saint-Louis-de-Terrebonne'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 Saint-Louis-de-Terrebonne lost since 2001?
Since 2001, the area within 10 km of Saint-Louis-de-Terrebonne has lost about 1,300 hectares of forest (about 1,800 football pitches): 12% of the forest it had in 2000. Most of it (95%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Saint-Louis-de-Terrebonne stayed about the same size, at about 15,200 hectares: new forest grew on about 947 hectares, and about 644 hectares were lost.
What is the tree count in Saint-Louis-de-Terrebonne?
Saint-Louis-de-Terrebonne has an estimated 213,942 trees across the 12.57 km² measured — 68.1% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Saint-Louis-de-Terrebonne need?
Saint-Louis-de-Terrebonne has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Saint-Louis-de-Terrebonne's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Terrebonne, 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 Terrebonne; the tree count is an estimate derived from that cover.
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