City report · Ontario, Canada
Windsor Air quality today
Air quality in Windsor currently reads AQI 113 (Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
AQI 113
Air quality right now
Unhealthy for sensitive groups
- PM2.5, fine particles (µg/m³)
- 22.1
- tree cover
- 25.6%
- trees in this area
- 79.9K
- more trees needed
- 29.4K
Measured across a 2 km radius around Walkerville, Windsor, ON, Canada (12.57 km²), from a satellite image of Aug 28, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Windsor · AQI 113 (Unhealthy for sensitive groups)
Windsor's tree count comes to 79,942 trees across 12.49 km² of land, 9 points below the 35% tree-cover level considered healthy for this area, so roughly 29,354 more trees would close the gap.
Air quality detail
Air quality in Windsor today: AQI 113, Unhealthy for sensitive groups
Main pollutant: PM10 · Observed Nov 11, 11:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Windsor West, 4.7 km away · median of 6 stations
Health signal
Sensitive groups should limit long or intense outdoor activity.
PM2.5
22.1
PM10
179.0
NO₂
69.3
O₃
5.9
SO₂
2.2
CO
0.0
Data: OpenAQ · AirNow
- Outdoor exercise
- Children, older adults and people with asthma or heart disease should cut down long or hard exercise
- Windows
- Close them to keep the outside air out
- Mask
- Sensitive groups: an N95 outdoors
- Air purifier
- Run one, especially in bedrooms
Over the last 7 days, the CAMS air-quality model put Windsor's daily AQI at 28 on average, from 18 on Nov 6 to an hourly peak of 65 on Nov 9.
This is the US EPA AQI. How it differs from Canada's AQHI
Where Windsor stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Windsor: Below target
25.6% tree cover against a 35% healthy-neighborhood target, across 12.49 km² of land.
Trees in this area
79,942
Target trees
109,296
More trees needed
29,354
CO₂ if planted / yr
645.8 t
Deforestation · 2001–2025
How much forest has Windsor lost?
Since 2001, the area within 10 km of Windsor has lost about 40 hectares of forest (about 57 football pitches): 2.3% of the forest it had in 2000. Most of it (82%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 40 haabout 57 football pitches
- Share of its forest
- 2.3%of what there was in 2000
- Cleared for good
- 33 hadeforestation: turned into farms, mines or towns
The worst year was 2012, when about 11 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 | 3 ha | 2 ha | 5 ha |
| 2002 | under 1 ha | under 1 ha | 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | 1 ha | under 1 ha | 1 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 | 1 ha | under 1 ha | 2 ha |
| 2012 | 10 ha | under 1 ha | 11 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 | 1 ha | under 1 ha | 1 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | 3 ha | under 1 ha | 3 ha |
| 2019 | 2 ha | under 1 ha | 2 ha |
| 2020 | 5 ha | under 1 ha | 5 ha |
| 2021 | 1 ha | under 1 ha | 2 ha |
| 2022 | under 1 ha | under 1 ha | 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 Windsor?
- Towns and roadscleared for good72% · 29 ha
- Farms, pasture and plantationscleared for good10% · 4 ha
- Unknown causescause unknown18% · 7 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
- 7,820 ha
- Forest in 2020
- 8,330 ha
- Overall change
- +503 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Windsor grew from about 7,820 hectares to 8,330 hectares, a net gain of about 503 hectares (+6.4%). New forest grew on about 564 hectares, while 61 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 Windsor
Same 2 km radius, same index — so they compare directly.
- Warren21.2 km
United States
- Tree cover
- 25%
- Air quality
- 58
- Sterling Heights31.2 km
United States
- Tree cover
- 18%
- Air quality
- 51
- Clinton Township32.9 km
United States
- Tree cover
- 43%
- Air quality
- 51
- Ann Arbor59.6 km
United States
- Tree cover
- 55%
- Air quality
- 41
- Lansing135.0 km
United States
- Tree cover
- 33%
- Air quality
- 55
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Frequently asked
Questions about Windsor
What is the air quality (AQI) in Windsor right now?
The latest reading for Windsor shows an AQI of 113 (Unhealthy for sensitive groups), measured Nov 11, 11:00 local time by 6 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Windsor West, 4.7 km away). The main pollutant is PM10. Sensitive groups should limit long or intense outdoor activity.
Is it safe to exercise outside in Windsor today?
At AQI 113 (Unhealthy for sensitive groups): children, older adults and people with asthma or heart disease should cut down long or hard exercise. Windows: close them to keep the outside air out. Masks: sensitive groups: an N95 outdoors. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Windsor been like this week?
Over the last 7 days, the CAMS air-quality model put Windsor's daily AQI at 28 on average, from 18 on Nov 6 to an hourly peak of 65 on Nov 9. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
Is Windsor'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 Windsor lost since 2001?
Since 2001, the area within 10 km of Windsor has lost about 40 hectares of forest (about 57 football pitches): 2.3% of the forest it had in 2000. Most of it (82%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Windsor grew from about 7,820 hectares to 8,330 hectares, a net gain of about 503 hectares (+6.4%). New forest grew on about 564 hectares, while 61 hectares were lost.
What is the tree count in Windsor?
Windsor has an estimated 79,942 trees across the 12.49 km² of land measured — 25.6% tree cover, 9 percentage points short of the 35% tree-cover target set for this area.
How many more trees does Windsor need?
Windsor needs roughly 29,354 more trees to close a 9-point shortfall against its 35% tree-cover target — about 645.8 t of extra CO₂ absorbed per year once grown.
How are Windsor's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Walkerville, 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 Walkerville; the tree count is an estimate derived from that cover.
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