City report · Overijssel, The Netherlands
Zwolle Air quality today
Air quality in Zwolle currently reads AQI 125 (Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
AQI 125
Air quality right now
Unhealthy for sensitive groups
- PM2.5, fine particles (µg/m³)
- 45.3
- tree cover
- 31.3%
- trees in this area
- 97.3K
- more trees needed
- 11.5K
Measured across a 2 km radius around City Centre, Zwolle, Netherlands (12.57 km²), from a satellite image of Sep 6, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Zwolle · AQI 125 (Unhealthy for sensitive groups)
Zwolle's tree count comes to 97,250 trees across 12.43 km² of land, 4 points below the 35% tree-cover level considered healthy for this area, so roughly 11,496 more trees would close the gap.
Air quality detail
Air quality in Zwolle today: AQI 125, Unhealthy for sensitive groups
Main pollutant: PM2.5 · Observed Nov 11, 20:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Westerstraat, Zwolle, 700 m away
Health signal
Sensitive groups should limit long or intense outdoor activity.
PM2.5
45.3
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, Joey Boon
- 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 Zwolle's daily AQI at 65 on average, from 39 on Nov 4 to an hourly peak of 90 on Nov 10.
Where Zwolle stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Zwolle: Below target
31.3% tree cover against a 35% healthy-neighborhood target, across 12.43 km² of land.
Trees in this area
97,250
Target trees
108,746
More trees needed
11,496
CO₂ if planted / yr
252.9 t
Deforestation · 2001–2025
How much forest has Zwolle lost?
Since 2001, the area within 10 km of Zwolle has lost about 196 hectares of forest (about 270 football pitches): 4.6% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 5 hectares (2.3%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km southwest of the city center.
- Forest lost since 2001
- 196 haabout 270 football pitches
- Share of its forest
- 4.6%of what there was in 2000
- Cleared for good
- 5 hadeforestation: turned into farms, mines or towns
The worst year was 2009, when about 26 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 | 8 ha | 9 ha |
| 2002 | under 1 ha | 6 ha | 6 ha |
| 2003 | under 1 ha | 4 ha | 4 ha |
| 2004 | under 1 ha | 1 ha | 1 ha |
| 2005 | under 1 ha | 10 ha | 11 ha |
| 2006 | under 1 ha | 21 ha | 21 ha |
| 2007 | under 1 ha | 11 ha | 11 ha |
| 2008 | under 1 ha | 13 ha | 13 ha |
| 2009 | under 1 ha | 26 ha | 26 ha |
| 2010 | under 1 ha | 3 ha | 3 ha |
| 2011 | under 1 ha | 6 ha | 6 ha |
| 2012 | under 1 ha | 7 ha | 7 ha |
| 2013 | under 1 ha | 2 ha | 2 ha |
| 2014 | under 1 ha | 1 ha | 1 ha |
| 2015 | under 1 ha | 10 ha | 10 ha |
| 2016 | under 1 ha | 14 ha | 14 ha |
| 2017 | 1 ha | 3 ha | 4 ha |
| 2018 | under 1 ha | 5 ha | 5 ha |
| 2019 | under 1 ha | 6 ha | 6 ha |
| 2020 | under 1 ha | 10 ha | 11 ha |
| 2021 | under 1 ha | 9 ha | 9 ha |
| 2022 | under 1 ha | 3 ha | 3 ha |
| 2023 | under 1 ha | 9 ha | 10 ha |
| 2024 | under 1 ha | 3 ha | 3 ha |
| 2025 | under 1 ha | 2 ha | 2 ha |
What is causing deforestation around Zwolle?
- Loggingcan grow back93% · 182 ha
- Towns and roadscleared for good1.7% · 3 ha
- Unknown causescause unknown4.6% · 9 ha
Also: farms, pasture and plantations.
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
- 3,050 ha
- Forest in 2020
- 3,370 ha
- Overall change
- +312 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Zwolle grew from about 3,050 hectares to 3,370 hectares, a net gain of about 312 hectares (+10%). New forest grew on about 386 hectares, while 73 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 Zwolle
Same 2 km radius, same index — so they compare directly.
- Apeldoorn34.7 km
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- Tree cover
- 34%
- Air quality
- 79
- Arnhem60.5 km
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- Tree cover
- 31%
- Air quality
- 80
- Almere Stad61.7 km
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- Tree cover
- 34%
- Air quality
- 111
- Amersfoort62.3 km
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- Tree cover
- 36%
- Air quality
- 122
- Enschede63.5 km
The Netherlands
- Tree cover
- 24%
- Air quality
- 67
- Nijmegen76.3 km
The Netherlands
- Tree cover
- 31%
- Air quality
- 82
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Frequently asked
Questions about Zwolle
What is the air quality (AQI) in Zwolle right now?
The latest reading for Zwolle shows an AQI of 125 (Unhealthy for sensitive groups), measured Nov 11, 20:00 local time by the Westerstraat, Zwolle ground monitoring station, 700 m away, via OpenAQ. The main pollutant is PM2.5. Sensitive groups should limit long or intense outdoor activity.
Is it safe to exercise outside in Zwolle today?
At AQI 125 (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 Zwolle been like this week?
Over the last 7 days, the CAMS air-quality model put Zwolle's daily AQI at 65 on average, from 39 on Nov 4 to an hourly peak of 90 on Nov 10. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Zwolle lost since 2001?
Since 2001, the area within 10 km of Zwolle has lost about 196 hectares of forest (about 270 football pitches): 4.6% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 5 hectares (2.3%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Zwolle grew from about 3,050 hectares to 3,370 hectares, a net gain of about 312 hectares (+10%). New forest grew on about 386 hectares, while 73 hectares were lost.
What is the tree count in Zwolle?
Zwolle has an estimated 97,250 trees across the 12.43 km² of land measured — 31.3% tree cover, 4 percentage points short of the 35% tree-cover target set for this area.
How many more trees does Zwolle need?
Zwolle needs roughly 11,496 more trees to close a 4-point shortfall against its 35% tree-cover target — about 252.9 t of extra CO₂ absorbed per year once grown.
How are Zwolle's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near City Centre, 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 City Centre; the tree count is an estimate derived from that cover.
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