City report · North Rhine-Westphalia, Germany
Bonn Air quality today
Air quality in Bonn currently reads AQI 54 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 54
Moderate
- PM2.5, fine particles (µg/m³)
- 10.8
- tree cover
- 39.8%
- trees in this area
- 115K
- more trees needed
- 0
Measured across a 2 km radius around Bonn-Zentrum, Bonn, Germany (12.57 km²), from a satellite image of Sep 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Bonn · AQI 54 (Moderate)
Bonn's tree count comes to 114,532 trees across 11.51 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Bonn today: AQI 54, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 17:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Beuel Mitte, 1.9 km away · median of 5 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
10.8
PM10
10.5
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, EEA, PHWI, wollnet
- 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 Bonn's daily AQI at 67 on average, from 45 on Nov 4 to an hourly peak of 92 on Nov 10.
Where Bonn stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Bonn: Healthy tree cover
39.8% tree cover against a 30% healthy-neighborhood target, across 11.51 km² of land.
Trees in this area
114,532
Target trees
114,532
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Bonn lost?
Since 2001, the area within 10 km of Bonn has lost about 945 hectares of forest (about 1,300 football pitches): 9.1% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 36 hectares (3.8%) 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 south of the city center.
- Forest lost since 2001
- 945 haabout 1,300 football pitches
- Share of its forest
- 9.1%of what there was in 2000
- Cleared for good
- 36 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 24 hectares a year in 2021–2025, down from 113 hectares a year in 2016–2020. The worst year was 2020, when about 286 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 | 3 ha | 4 ha |
| 2002 | under 1 ha | 17 ha | 18 ha |
| 2003 | under 1 ha | 6 ha | 7 ha |
| 2004 | under 1 ha | 22 ha | 23 ha |
| 2005 | under 1 ha | 17 ha | 17 ha |
| 2006 | 2 ha | 11 ha | 13 ha |
| 2007 | under 1 ha | 25 ha | 26 ha |
| 2008 | 2 ha | 51 ha | 53 ha |
| 2009 | under 1 ha | 8 ha | 9 ha |
| 2010 | 1 ha | 32 ha | 33 ha |
| 2011 | 2 ha | 10 ha | 11 ha |
| 2012 | under 1 ha | 18 ha | 19 ha |
| 2013 | 3 ha | 10 ha | 13 ha |
| 2014 | under 1 ha | 11 ha | 11 ha |
| 2015 | under 1 ha | 6 ha | 7 ha |
| 2016 | under 1 ha | 7 ha | 7 ha |
| 2017 | 2 ha | 23 ha | 25 ha |
| 2018 | 2 ha | 37 ha | 39 ha |
| 2019 | 9 ha | 199 ha | 208 ha |
| 2020 | 2 ha | 285 ha | 286 ha |
| 2021 | 3 ha | 96 ha | 100 ha |
| 2022 | 2 ha | 7 ha | 9 ha |
| 2023 | under 1 ha | 3 ha | 3 ha |
| 2024 | 1 ha | 2 ha | 3 ha |
| 2025 | under 1 ha | 3 ha | 3 ha |
What is causing deforestation around Bonn?
- Loggingcan grow back95% · 897 ha
- Towns and roadscleared for good3.8% · 36 ha
- Unknown causescause unknown1.3% · 12 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
- 16,300 ha
- Forest in 2020
- 16,600 ha
- Overall change
- +253 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Bonn stayed about the same size, at about 16,600 hectares: new forest grew on about 555 hectares, and about 302 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 Bonn
Same 2 km radius, same index — so they compare directly.
- Köln24.4 km
Germany
- Tree cover
- 27%
- Air quality
- 50
- Bergisch Gladbach28.1 km
Germany
- Tree cover
- 60%
- Air quality
- 56
- Leverkusen33.8 km
Germany
- Tree cover
- 33%
- Air quality
- 54
- Solingen48.8 km
Germany
- Tree cover
- 53%
- Air quality
- 53
- Koblenz54.4 km
Germany
- Tree cover
- 42%
- Air quality
- 60
- Wuppertal58.1 km
Germany
- Tree cover
- 52%
- Air quality
- 42
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Frequently asked
Questions about Bonn
What is the air quality (AQI) in Bonn right now?
The latest reading for Bonn shows an AQI of 54 (Moderate), measured Nov 11, 17:00 local time by 5 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Beuel Mitte, 1.9 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Bonn today?
At AQI 54 (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 Bonn been like this week?
Over the last 7 days, the CAMS air-quality model put Bonn's daily AQI at 67 on average, from 45 on Nov 4 to an hourly peak of 92 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 Bonn lost since 2001?
Since 2001, the area within 10 km of Bonn has lost about 945 hectares of forest (about 1,300 football pitches): 9.1% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 36 hectares (3.8%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about 24 hectares a year in 2021–2025, down from 113 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Bonn stayed about the same size, at about 16,600 hectares: new forest grew on about 555 hectares, and about 302 hectares were lost.
What is the tree count in Bonn?
Bonn has an estimated 114,532 trees across the 11.51 km² of land measured — 39.8% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Bonn need?
Bonn has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Bonn's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Bonn-Zentrum, 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 Bonn-Zentrum; the tree count is an estimate derived from that cover.
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