City report · Ontario, Canada
Barrie Air quality today
Air quality in Barrie currently reads AQI 28 (Good): Air quality is satisfactory for everyone.
AQI 28
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 5.0
- tree cover
- 39.2%
- trees in this area
- 97.8K
- more trees needed
- 0
Measured across a 2 km radius around Barrie, ON, Canada (12.57 km²), from a satellite image of Sep 12, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Barrie · AQI 28 (Good)
Barrie's tree count comes to 97,781 trees across 9.98 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Barrie today: AQI 28, Good
Main pollutant: PM2.5 · Observed Nov 11, 12:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Barrie, 3.5 km away
Health signal
Air quality is satisfactory for everyone.
PM2.5
5.0
PM10
—
NO₂
—
O₃
—
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 Barrie's daily AQI at 20 on average, from 9 on Nov 9 to an hourly peak of 48 on Nov 7.
This is the US EPA AQI. How it differs from Canada's AQHI
Where Barrie stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Barrie: Healthy tree cover
39.2% tree cover against a 30% healthy-neighborhood target, across 9.98 km² of land.
Trees in this area
97,781
Target trees
97,781
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Barrie lost?
Since 2001, the area within 10 km of Barrie has lost about 687 hectares of forest (about 960 football pitches): 6.9% of the forest it had in 2000. Most of it (88%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km west of the city center.
- Forest lost since 2001
- 687 haabout 960 football pitches
- Share of its forest
- 6.9%of what there was in 2000
- Cleared for good
- 607 hadeforestation: turned into farms, mines or towns
The worst year was 2025, when about 76 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 | 24 ha | under 1 ha | 24 ha |
| 2002 | 66 ha | 3 ha | 69 ha |
| 2003 | 30 ha | under 1 ha | 31 ha |
| 2004 | 35 ha | 3 ha | 38 ha |
| 2005 | 29 ha | 2 ha | 31 ha |
| 2006 | 34 ha | 1 ha | 35 ha |
| 2007 | 21 ha | 1 ha | 22 ha |
| 2008 | 23 ha | 1 ha | 24 ha |
| 2009 | 25 ha | under 1 ha | 26 ha |
| 2010 | 11 ha | 5 ha | 16 ha |
| 2011 | 11 ha | under 1 ha | 11 ha |
| 2012 | 7 ha | 3 ha | 10 ha |
| 2013 | 24 ha | under 1 ha | 24 ha |
| 2014 | 16 ha | under 1 ha | 16 ha |
| 2015 | 16 ha | under 1 ha | 17 ha |
| 2016 | 31 ha | under 1 ha | 31 ha |
| 2017 | 20 ha | 10 ha | 31 ha |
| 2018 | 44 ha | 3 ha | 47 ha |
| 2019 | 45 ha | 1 ha | 46 ha |
| 2020 | 8 ha | under 1 ha | 8 ha |
| 2021 | 15 ha | 3 ha | 18 ha |
| 2022 | 16 ha | 1 ha | 17 ha |
| 2023 | 14 ha | under 1 ha | 14 ha |
| 2024 | 6 ha | under 1 ha | 6 ha |
| 2025 | 36 ha | 40 ha | 76 ha |
What is causing deforestation around Barrie?
- Towns and roadscleared for good71% · 485 ha
- Farms, pasture and plantationscleared for good15% · 103 ha
- Loggingcan grow back4.6% · 32 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
- 8,570 ha
- Forest in 2020
- 10,400 ha
- Overall change
- +1,800 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Barrie grew from about 8,570 hectares to 10,400 hectares, a net gain of about 1,800 hectares (+21%). New forest grew on about 2,060 hectares, while 265 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 Barrie
What is the air quality (AQI) in Barrie right now?
The latest reading for Barrie shows an AQI of 28 (Good), measured Nov 11, 12:00 local time by the Barrie ground monitoring station, 3.5 km away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Barrie today?
At AQI 28 (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 Barrie been like this week?
Over the last 7 days, the CAMS air-quality model put Barrie's daily AQI at 20 on average, from 9 on Nov 9 to an hourly peak of 48 on Nov 7. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
Is Barrie'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 Barrie lost since 2001?
Since 2001, the area within 10 km of Barrie has lost about 687 hectares of forest (about 960 football pitches): 6.9% of the forest it had in 2000. Most of it (88%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Barrie grew from about 8,570 hectares to 10,400 hectares, a net gain of about 1,800 hectares (+21%). New forest grew on about 2,060 hectares, while 265 hectares were lost.
What is the tree count in Barrie?
Barrie has an estimated 97,781 trees across the 9.98 km² of land measured — 39.2% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Barrie need?
Barrie has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Barrie's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Barrie, 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 Barrie; the tree count is an estimate derived from that cover.
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