City report · Île-de-France, France
Boulogne-Billancourt Air quality today
Air quality in Boulogne-Billancourt currently reads AQI 35 (Good): Air quality is satisfactory for everyone.
AQI 35
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 6.3
- tree cover
- 29.5%
- trees in this area
- 86.2K
- more trees needed
- 1.5K
Measured across a 2 km radius around Ctre Ville, 92100 Boulogne-Billancourt, France (12.57 km²), from a satellite image of Sep 14, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Boulogne-Billancourt · AQI 35 (Good)
Boulogne-Billancourt's tree count comes to 86,190 trees across 11.69 km² of land, 1 points below the 30% tree-cover level considered healthy for this area, so roughly 1,461 more trees would close the gap.
Air quality detail
Air quality in Boulogne-Billancourt today: AQI 35, Good
Main pollutant: PM2.5 · Observed Nov 11, 17:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · LA DEFENSE, 6.2 km away · median of 12 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.3
PM10
7.7
NO₂
16.9
O₃
55.2
SO₂
—
CO
174.0
Data: OpenAQ · EEA
- 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 Boulogne-Billancourt's daily AQI at 76 on average, from 58 on Nov 4 to an hourly peak of 111 on Nov 7.
Where Boulogne-Billancourt stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Boulogne-Billancourt: Below target
29.5% tree cover against a 30% healthy-neighborhood target, across 11.69 km² of land.
Trees in this area
86,190
Target trees
87,651
More trees needed
1,461
CO₂ if planted / yr
32.1 t
Deforestation · 2001–2025
How much forest has Boulogne-Billancourt lost?
Since 2001, the area within 10 km of Boulogne-Billancourt has lost about 161 hectares of forest (about 220 football pitches): 2.5% of the forest it had in 2000. Most of it (56%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 161 haabout 220 football pitches
- Share of its forest
- 2.5%of what there was in 2000
- Cleared for good
- 90 hadeforestation: turned into farms, mines or towns
The worst year was 2008, when about 31 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 | 9 ha | 11 ha | 20 ha |
| 2002 | 5 ha | 1 ha | 6 ha |
| 2003 | 5 ha | 2 ha | 7 ha |
| 2004 | 4 ha | 3 ha | 7 ha |
| 2005 | 9 ha | 4 ha | 14 ha |
| 2006 | 1 ha | 1 ha | 2 ha |
| 2007 | 2 ha | 2 ha | 4 ha |
| 2008 | 18 ha | 13 ha | 31 ha |
| 2009 | 2 ha | under 1 ha | 2 ha |
| 2010 | 3 ha | 1 ha | 5 ha |
| 2011 | 3 ha | 5 ha | 8 ha |
| 2012 | 4 ha | 2 ha | 6 ha |
| 2013 | 2 ha | under 1 ha | 3 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | 1 ha |
| 2017 | 4 ha | 4 ha | 8 ha |
| 2018 | 4 ha | 3 ha | 7 ha |
| 2019 | 4 ha | 3 ha | 7 ha |
| 2020 | under 1 ha | 1 ha | 2 ha |
| 2021 | 1 ha | 4 ha | 6 ha |
| 2022 | 2 ha | under 1 ha | 2 ha |
| 2023 | under 1 ha | 2 ha | 2 ha |
| 2024 | 6 ha | 6 ha | 12 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Boulogne-Billancourt?
- Towns and roadscleared for good55% · 89 ha
- Loggingcan grow back33% · 53 ha
- Unknown causescause unknown11% · 18 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
- 13,100 ha
- Forest in 2020
- 13,700 ha
- Overall change
- +608 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Boulogne-Billancourt grew from about 13,100 hectares to 13,700 hectares, a net gain of about 608 hectares (+4.7%). New forest grew on about 703 hectares, while 95 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 Boulogne-Billancourt
Same 2 km radius, same index — so they compare directly.
- Argenteuil12.5 km
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- Air quality
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- 17.8 km
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- Air quality
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- Cergy-Pontoise25.6 km
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- 42%
- Air quality
- 28
- Marne La Vallée29.4 km
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- Tree cover
- 39%
- Air quality
- 36
- Orléans106.7 km
France
- Tree cover
- 23%
- Air quality
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- Rouen107.1 km
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- Tree cover
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- Air quality
- 26
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Frequently asked
Questions about Boulogne-Billancourt
What is the air quality (AQI) in Boulogne-Billancourt right now?
The latest reading for Boulogne-Billancourt shows an AQI of 35 (Good), measured Nov 11, 17:00 local time by 12 ground monitoring stations via OpenAQ (the median of their readings; the nearest is LA DEFENSE, 6.2 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Boulogne-Billancourt today?
At AQI 35 (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 Boulogne-Billancourt been like this week?
Over the last 7 days, the CAMS air-quality model put Boulogne-Billancourt's daily AQI at 76 on average, from 58 on Nov 4 to an hourly peak of 111 on Nov 7. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Boulogne-Billancourt lost since 2001?
Since 2001, the area within 10 km of Boulogne-Billancourt has lost about 161 hectares of forest (about 220 football pitches): 2.5% of the forest it had in 2000. Most of it (56%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Boulogne-Billancourt grew from about 13,100 hectares to 13,700 hectares, a net gain of about 608 hectares (+4.7%). New forest grew on about 703 hectares, while 95 hectares were lost.
What is the tree count in Boulogne-Billancourt?
Boulogne-Billancourt has an estimated 86,190 trees across the 11.69 km² of land measured — 29.5% tree cover, 1 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Boulogne-Billancourt need?
Boulogne-Billancourt needs roughly 1,461 more trees to close a 1-point shortfall against its 30% tree-cover target — about 32.1 t of extra CO₂ absorbed per year once grown.
How are Boulogne-Billancourt's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Ctre Ville, 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 Ctre Ville; the tree count is an estimate derived from that cover.
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