City report · Alberta, Canada
Lethbridge Air quality today
Air quality in Lethbridge currently reads AQI 23 (Good): Air quality is satisfactory for everyone.
AQI 23
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 1.3
- tree cover
- 25.9%
- trees in this area
- 80.7K
- more trees needed
- 12.8K
Measured across a 2 km radius around Westminister, Lethbridge, AB, Canada (12.57 km²), from a satellite image of Aug 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Lethbridge · AQI 23 (Good)
Lethbridge's tree count comes to 80,716 trees across 12.47 km² of land, 4 points below the 30% tree-cover level considered healthy for this area, so roughly 12,777 more trees would close the gap.
Air quality detail
Air quality in Lethbridge today: AQI 23, Good
Main pollutant: Ozone · Observed Nov 11, 09:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Lethbridge, 2.2 km away
Health signal
Air quality is satisfactory for everyone.
PM2.5
1.3
PM10
—
NO₂
—
O₃
49.1
SO₂
—
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 Lethbridge's daily AQI at 18 on average, from 7 on Nov 6 to an hourly peak of 56 on Nov 4.
This is the US EPA AQI. How it differs from Canada's AQHI
Where Lethbridge stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Lethbridge: Below target
25.9% tree cover against a 30% healthy-neighborhood target, across 12.47 km² of land.
Trees in this area
80,716
Target trees
93,493
More trees needed
12,777
CO₂ if planted / yr
281.1 t
Deforestation · 2001–2025
How much forest has Lethbridge lost?
Since 2001, the area within 10 km of Lethbridge has lost about 7 hectares of forest (about 9 football pitches): 5.9% of the forest it had in 2000. The biggest cause was mining and energy (26%). About 3 hectares (42%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 7 haabout 9 football pitches
- Share of its forest
- 5.9%of what there was in 2000
- Cleared for good
- 3 hadeforestation: turned into farms, mines or towns
The worst year was 2002, when about 1 hectare 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 | under 1 ha | under 1 ha | under 1 ha |
| 2002 | under 1 ha | 1 ha | 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | 1 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | 1 ha | under 1 ha | 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 | under 1 ha | under 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 | under 1 ha | under 1 ha | under 1 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 Lethbridge?
- Mining and energycleared for good26% · 2 ha
- Storms, floods and other natural causescan grow back14% · under 1 ha
- Towns and roadscleared for good11% · under 1 ha
Also: farms, pasture and plantations, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
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. Images: contains modified Copernicus Sentinel data. How it's measured
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Frequently asked
Questions about Lethbridge
What is the air quality (AQI) in Lethbridge right now?
The latest reading for Lethbridge shows an AQI of 23 (Good), measured Nov 11, 09:00 local time by the Lethbridge ground monitoring station, 2.2 km away, via OpenAQ. The main pollutant is Ozone. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Lethbridge today?
At AQI 23 (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 Lethbridge been like this week?
Over the last 7 days, the CAMS air-quality model put Lethbridge's daily AQI at 18 on average, from 7 on Nov 6 to an hourly peak of 56 on Nov 4. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
Is Lethbridge'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 Lethbridge lost since 2001?
Since 2001, the area within 10 km of Lethbridge has lost about 7 hectares of forest (about 9 football pitches): 5.9% of the forest it had in 2000. The biggest cause was mining and energy (26%). About 3 hectares (42%) was deforestation: forest cleared for good for farms, mines or towns.
What is the tree count in Lethbridge?
Lethbridge has an estimated 80,716 trees across the 12.47 km² of land measured — 25.9% tree cover, 4 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Lethbridge need?
Lethbridge needs roughly 12,777 more trees to close a 4-point shortfall against its 30% tree-cover target — about 281.1 t of extra CO₂ absorbed per year once grown.
How are Lethbridge's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Westminister, 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 Westminister; the tree count is an estimate derived from that cover.
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