City report · Ontario, Canada
Mississauga Air quality today
Air quality in Mississauga currently reads AQI 58 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 58
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 12.9
- tree cover
- 22.8%
- trees in this area
- 71.6K
- more trees needed
- 22.6K
Measured across a 2 km radius around Mississauga, ON, Canada (12.57 km²), from a satellite image of Aug 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Mississauga · AQI 58 (Moderate)
Mississauga's tree count comes to 71,628 trees across 12.57 km², 7 points below the 30% tree-cover level considered healthy for this area, so roughly 22,619 more trees would close the gap.
Air quality detail
Air quality in Mississauga today: AQI 58, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 11:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Mississauga , 1.6 km away · median of 2 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
12.9
PM10
—
NO₂
39.5
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, AirNow, Bill Stock
- Outdoor exercise
- Fine for most people; unusually sensitive people should take long or hard exercise easier
- Windows
- Fine to open; close them if you are sensitive to pollution
- Mask
- Not needed for most people
- Air purifier
- Worth running if you are sensitive
Over the last 7 days, the CAMS air-quality model put Mississauga's daily AQI at 27 on average, from 14 on Nov 9 to an hourly peak of 53 on Nov 7.
This is the US EPA AQI. How it differs from Canada's AQHI
Where Mississauga stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Mississauga: Below target
22.8% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
71,628
Target trees
94,247
More trees needed
22,619
CO₂ if planted / yr
497.6 t
Deforestation · 2001–2025
How much forest has Mississauga lost?
Since 2001, the area within 10 km of Mississauga has lost about 48 hectares of forest (about 67 football pitches): 1.6% of the forest it had in 2000. Most of it (70%) 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
- 48 haabout 67 football pitches
- Share of its forest
- 1.6%of what there was in 2000
- Cleared for good
- 33 hadeforestation: turned into farms, mines or towns
The worst year was 2022, when about 12 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 | 7 ha | 2 ha | 9 ha |
| 2002 | 1 ha | under 1 ha | 2 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 3 ha | 1 ha | 4 ha |
| 2005 | under 1 ha | under 1 ha | 1 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | 2 ha | 3 ha |
| 2008 | under 1 ha | 1 ha | 2 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 | 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 | 1 ha | under 1 ha | 2 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | under 1 ha | 1 ha |
| 2019 | under 1 ha | 1 ha | 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | 1 ha | under 1 ha | 2 ha |
| 2022 | 12 ha | under 1 ha | 12 ha |
| 2023 | 3 ha | under 1 ha | 3 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | 1 ha | under 1 ha | 1 ha |
What is causing deforestation around Mississauga?
- Towns and roadscleared for good70% · 33 ha
- Loggingcan grow back1.9% · under 1 ha
- Unknown causescause unknown28% · 13 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
- 8,060 ha
- Forest in 2020
- 8,280 ha
- Overall change
- +223 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Mississauga grew from about 8,060 hectares to 8,280 hectares, a net gain of about 223 hectares (+2.8%). New forest grew on about 319 hectares, while 96 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
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Frequently asked
Questions about Mississauga
What is the air quality (AQI) in Mississauga right now?
The latest reading for Mississauga shows an AQI of 58 (Moderate), measured Nov 11, 11:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Mississauga , 1.6 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Mississauga today?
At AQI 58 (Moderate): fine for most people; unusually sensitive people should take long or hard exercise easier. Windows: fine to open; close them if you are sensitive to pollution. Masks: not needed for most people. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Mississauga been like this week?
Over the last 7 days, the CAMS air-quality model put Mississauga's daily AQI at 27 on average, from 14 on Nov 9 to an hourly peak of 53 on Nov 7. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
Is Mississauga'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 Mississauga lost since 2001?
Since 2001, the area within 10 km of Mississauga has lost about 48 hectares of forest (about 67 football pitches): 1.6% of the forest it had in 2000. Most of it (70%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Mississauga grew from about 8,060 hectares to 8,280 hectares, a net gain of about 223 hectares (+2.8%). New forest grew on about 319 hectares, while 96 hectares were lost.
What is the tree count in Mississauga?
Mississauga has an estimated 71,628 trees across the 12.57 km² measured — 22.8% tree cover, 7 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Mississauga need?
Mississauga needs roughly 22,619 more trees to close a 7-point shortfall against its 30% tree-cover target — about 497.6 t of extra CO₂ absorbed per year once grown.
How are Mississauga's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Mississauga, 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 Mississauga; the tree count is an estimate derived from that cover.
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