City report · Ontario, Canada
Cambridge Air quality today
Air quality in Cambridge currently reads AQI 62 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 62
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 15.1
- tree cover
- 42.4%
- trees in this area
- 131K
- more trees needed
- 0
Measured across a 2 km radius around Cambridge, ON, Canada (12.57 km²), from a satellite image of Sep 14, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Cambridge · AQI 62 (Moderate)
Cambridge's tree count comes to 130,539 trees across 12.32 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Cambridge today: AQI 62, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 12:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Midtown Kitchener, 18.7 km away · median of 6 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
15.1
PM10
—
NO₂
33.9
O₃
9.8
SO₂
—
CO
—
Data: OpenAQ · AirGradient, AirNow, FarmerAndy, Flaelin, octal
- 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 Cambridge's daily AQI at 23 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 Cambridge stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Cambridge: Healthy tree cover
42.4% tree cover against a 30% healthy-neighborhood target, across 12.32 km² of land.
Trees in this area
130,539
Target trees
130,539
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Cambridge lost?
Since 2001, the area within 10 km of Cambridge has lost about 103 hectares of forest (about 140 football pitches): 1.1% of the forest it had in 2000. Most of it (75%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from June 2017 of a 5 × 5 km area about 3 km southeast of the city center.
- Forest lost since 2001
- 103 haabout 140 football pitches
- Share of its forest
- 1.1%of what there was in 2000
- Cleared for good
- 77 hadeforestation: turned into farms, mines or towns
The worst year was 2021, when about 16 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 | under 1 ha | under 1 ha | 1 ha |
| 2002 | 3 ha | under 1 ha | 4 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | 1 ha |
| 2005 | 9 ha | 2 ha | 11 ha |
| 2006 | 2 ha | 1 ha | 3 ha |
| 2007 | under 1 ha | 1 ha | 2 ha |
| 2008 | 5 ha | 2 ha | 7 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | 3 ha | 2 ha | 6 ha |
| 2011 | 1 ha | 1 ha | 2 ha |
| 2012 | 1 ha | under 1 ha | 2 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | 3 ha | under 1 ha | 3 ha |
| 2015 | 1 ha | under 1 ha | 1 ha |
| 2016 | 3 ha | under 1 ha | 3 ha |
| 2017 | 6 ha | 1 ha | 7 ha |
| 2018 | 5 ha | under 1 ha | 6 ha |
| 2019 | 6 ha | 2 ha | 7 ha |
| 2020 | 4 ha | 2 ha | 6 ha |
| 2021 | 13 ha | 3 ha | 16 ha |
| 2022 | 1 ha | under 1 ha | 2 ha |
| 2023 | 4 ha | under 1 ha | 5 ha |
| 2024 | under 1 ha | under 1 ha | 1 ha |
| 2025 | 2 ha | 3 ha | 5 ha |
What is causing deforestation around Cambridge?
- Towns and roadscleared for good64% · 66 ha
- Farms, pasture and plantationscleared for good8.3% · 9 ha
- Loggingcan grow back6.4% · 7 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
- 9,100 ha
- Forest in 2020
- 9,810 ha
- Overall change
- +707 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Cambridge grew from about 9,100 hectares to 9,810 hectares, a net gain of about 707 hectares (+7.8%). New forest grew on about 922 hectares, while 214 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 Cambridge
What is the air quality (AQI) in Cambridge right now?
The latest reading for Cambridge shows an AQI of 62 (Moderate), measured Nov 11, 12:00 local time by 6 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Midtown Kitchener, 18.7 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Cambridge today?
At AQI 62 (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 Cambridge been like this week?
Over the last 7 days, the CAMS air-quality model put Cambridge's daily AQI at 23 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 Cambridge'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 Cambridge lost since 2001?
Since 2001, the area within 10 km of Cambridge has lost about 103 hectares of forest (about 140 football pitches): 1.1% of the forest it had in 2000. Most of it (75%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Cambridge grew from about 9,100 hectares to 9,810 hectares, a net gain of about 707 hectares (+7.8%). New forest grew on about 922 hectares, while 214 hectares were lost.
What is the tree count in Cambridge?
Cambridge has an estimated 130,539 trees across the 12.32 km² of land measured — 42.4% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Cambridge need?
Cambridge has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Cambridge's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Cambridge, 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 Cambridge; the tree count is an estimate derived from that cover.
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