City report · Ontario, Canada
London Air quality today
Air quality in London currently reads AQI 58 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 58
Moderate
- PM2.5, fine particles (µg/m³)
- 13.0
- tree cover
- 31.4%
- trees in this area
- 98.6K
- more trees needed
- 0
Measured across a 2 km radius around Central London, London, ON, Canada (12.57 km²), from a satellite image of Sep 10, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
London · AQI 58 (Moderate)
London's tree count comes to 98,646 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 London today: AQI 58, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 09:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · London, 2.8 km away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
13.0
PM10
—
NO₂
16.9
O₃
2.0
SO₂
—
CO
—
Data: OpenAQ · AirNow
- 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 London's daily AQI at 18 on average, from 11 on Nov 9 to an hourly peak of 52 on Nov 8.
This is the US EPA AQI. How it differs from Canada's AQHI
Where London stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in London: Healthy tree cover
31.4% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
98,646
Target trees
98,646
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has London lost?
Since 2001, the area within 10 km of London has lost about 153 hectares of forest (about 210 football pitches): 3.8% of the forest it had in 2000. Most of it (89%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 153 haabout 210 football pitches
- Share of its forest
- 3.8%of what there was in 2000
- Cleared for good
- 136 hadeforestation: turned into farms, mines or towns
The worst year was 2017, when about 17 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 | 5 ha | 1 ha | 6 ha |
| 2002 | 7 ha | under 1 ha | 8 ha |
| 2003 | 4 ha | under 1 ha | 4 ha |
| 2004 | 4 ha | under 1 ha | 5 ha |
| 2005 | 9 ha | 3 ha | 11 ha |
| 2006 | 4 ha | under 1 ha | 4 ha |
| 2007 | 11 ha | 2 ha | 13 ha |
| 2008 | 12 ha | 1 ha | 13 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | 7 ha | under 1 ha | 8 ha |
| 2011 | 6 ha | under 1 ha | 6 ha |
| 2012 | 4 ha | under 1 ha | 5 ha |
| 2013 | 2 ha | under 1 ha | 2 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | 2 ha | under 1 ha | 2 ha |
| 2016 | 9 ha | 1 ha | 10 ha |
| 2017 | 16 ha | 1 ha | 17 ha |
| 2018 | 6 ha | under 1 ha | 6 ha |
| 2019 | 3 ha | under 1 ha | 3 ha |
| 2020 | 6 ha | under 1 ha | 6 ha |
| 2021 | 7 ha | 1 ha | 9 ha |
| 2022 | 2 ha | under 1 ha | 3 ha |
| 2023 | 5 ha | under 1 ha | 5 ha |
| 2024 | 3 ha | under 1 ha | 3 ha |
| 2025 | 4 ha | under 1 ha | 4 ha |
What is causing deforestation around London?
- Towns and roadscleared for good79% · 120 ha
- Farms, pasture and plantationscleared for good9% · 14 ha
- Loggingcan grow back3.3% · 5 ha
Also: mining and energy, 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
- 7,730 ha
- Forest in 2020
- 8,170 ha
- Overall change
- +444 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around London grew from about 7,730 hectares to 8,170 hectares, a net gain of about 444 hectares (+5.7%). New forest grew on about 608 hectares, while 164 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 London
Same 2 km radius, same index — so they compare directly.
- Brantford80.3 km
Canada
- Tree cover
- 37%
- Air quality
- 55
- Cambridge85.6 km
Canada
- Tree cover
- 42%
- Air quality
- 55
- Guelph100.8 km
Canada
- Tree cover
- 52%
- Air quality
- 54
- Hamilton116.1 km
Canada
- Tree cover
- 28%
- Air quality
- 50
- Burlington121.7 km
Canada
- Tree cover
- 40%
- Air quality
- 44
Also compared:London vs Windsor
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Frequently asked
Questions about London
What is the air quality (AQI) in London right now?
The latest reading for London shows an AQI of 58 (Moderate), measured Nov 11, 09:00 local time by the London ground monitoring station, 2.8 km away, via OpenAQ. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in London 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 London been like this week?
Over the last 7 days, the CAMS air-quality model put London's daily AQI at 18 on average, from 11 on Nov 9 to an hourly peak of 52 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
Is London'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 London lost since 2001?
Since 2001, the area within 10 km of London has lost about 153 hectares of forest (about 210 football pitches): 3.8% of the forest it had in 2000. Most of it (89%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around London grew from about 7,730 hectares to 8,170 hectares, a net gain of about 444 hectares (+5.7%). New forest grew on about 608 hectares, while 164 hectares were lost.
What is the tree count in London?
London has an estimated 98,646 trees across the 12.57 km² measured — 31.4% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does London need?
London has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are London's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Central London, 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 Central London; the tree count is an estimate derived from that cover.
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