City report · Île-de-France, France
Marne La Vallée Air quality today
Air quality in Marne La Vallée currently reads AQI 36 (Good): Air quality is satisfactory for everyone.
AQI 36
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 6.4
- tree cover
- 38.8%
- trees in this area
- 120K
- more trees needed
- 0
Measured across a 2 km radius around 77185 Lognes, France (12.57 km²), from a satellite image of Sep 1, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Marne La Vallée · AQI 36 (Good)
Marne La Vallée's tree count comes to 120,187 trees across 12.39 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Marne La Vallée today: AQI 36, 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 · VITRY-SUR-SEINE, 20.6 km away · median of 20 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.4
PM10
11.6
NO₂
14.1
O₃
53.5
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 Marne La Vallée's daily AQI at 74 on average, from 56 on Nov 4 to an hourly peak of 134 on Nov 6.
Where Marne La Vallée stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Marne La Vallée: Healthy tree cover
38.8% tree cover against a 30% healthy-neighborhood target, across 12.39 km² of land.
Trees in this area
120,187
Target trees
120,187
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Marne La Vallée lost?
Since 2001, the area within 10 km of Marne La Vallée has lost about 336 hectares of forest (about 470 football pitches): 3.4% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 100 hectares (30%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area about 6 km southeast of the city center.
- Forest lost since 2001
- 336 haabout 470 football pitches
- Share of its forest
- 3.4%of what there was in 2000
- Cleared for good
- 100 hadeforestation: turned into farms, mines or towns
The worst year was 2023, when about 65 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 | 3 ha | 22 ha | 25 ha |
| 2002 | 4 ha | under 1 ha | 4 ha |
| 2003 | 17 ha | 17 ha | 34 ha |
| 2004 | 3 ha | 30 ha | 32 ha |
| 2005 | 5 ha | 11 ha | 16 ha |
| 2006 | 7 ha | 14 ha | 21 ha |
| 2007 | 6 ha | 14 ha | 20 ha |
| 2008 | 4 ha | 13 ha | 17 ha |
| 2009 | 4 ha | 5 ha | 9 ha |
| 2010 | 1 ha | 5 ha | 6 ha |
| 2011 | 4 ha | 14 ha | 18 ha |
| 2012 | 3 ha | 1 ha | 4 ha |
| 2013 | 4 ha | under 1 ha | 4 ha |
| 2014 | 1 ha | under 1 ha | 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | 2 ha | under 1 ha | 2 ha |
| 2017 | 3 ha | under 1 ha | 4 ha |
| 2018 | 3 ha | 2 ha | 4 ha |
| 2019 | 2 ha | 2 ha | 4 ha |
| 2020 | 5 ha | 1 ha | 6 ha |
| 2021 | 5 ha | 9 ha | 14 ha |
| 2022 | 2 ha | 10 ha | 12 ha |
| 2023 | 8 ha | 57 ha | 65 ha |
| 2024 | 5 ha | 7 ha | 12 ha |
| 2025 | under 1 ha | 1 ha | 1 ha |
What is causing deforestation around Marne La Vallée?
- Loggingcan grow back65% · 219 ha
- Towns and roadscleared for good25% · 84 ha
- Farms, pasture and plantationscleared for good4.6% · 16 ha
Also: 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
- 16,200 ha
- Forest in 2020
- 16,800 ha
- Overall change
- +606 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Marne La Vallée grew from about 16,200 hectares to 16,800 hectares, a net gain of about 606 hectares (+3.7%). New forest grew on about 771 hectares, while 165 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 Marne La Vallée
Same 2 km radius, same index — so they compare directly.
- Paris21.6 km
France
- Tree cover
- 13%
- Air quality
- 34
- Boulogne-Billancourt29.4 km
France
- Tree cover
- 30%
- Air quality
- 36
- Argenteuil31.5 km
France
- Tree cover
- 24%
- Air quality
- 31
- 46.2 km
- Tree cover
- 48%
- Air quality
- 34
- Cergy-Pontoise47.0 km
France
- Tree cover
- 42%
- Air quality
- 28
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Frequently asked
Questions about Marne La Vallée
What is the air quality (AQI) in Marne La Vallée right now?
The latest reading for Marne La Vallée shows an AQI of 36 (Good), measured Nov 11, 17:00 local time by 20 ground monitoring stations via OpenAQ (the median of their readings; the nearest is VITRY-SUR-SEINE, 20.6 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Marne La Vallée today?
At AQI 36 (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 Marne La Vallée been like this week?
Over the last 7 days, the CAMS air-quality model put Marne La Vallée's daily AQI at 74 on average, from 56 on Nov 4 to an hourly peak of 134 on Nov 6. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Marne La Vallée lost since 2001?
Since 2001, the area within 10 km of Marne La Vallée has lost about 336 hectares of forest (about 470 football pitches): 3.4% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 100 hectares (30%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Marne La Vallée grew from about 16,200 hectares to 16,800 hectares, a net gain of about 606 hectares (+3.7%). New forest grew on about 771 hectares, while 165 hectares were lost.
What is the tree count in Marne La Vallée?
Marne La Vallée has an estimated 120,187 trees across the 12.39 km² of land measured — 38.8% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Marne La Vallée need?
Marne La Vallée has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Marne La Vallée's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 77185 Lognes, 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 77185 Lognes; the tree count is an estimate derived from that cover.
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