City report · Île-de-France, France
Cergy-Pontoise Air quality today
Air quality in Cergy-Pontoise 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
- 42.2%
- trees in this area
- 128K
- more trees needed
- 0
Measured across a 2 km radius around Cergy, France (12.57 km²), from a satellite image of Sep 14, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Cergy-Pontoise · AQI 28 (Good)
Cergy-Pontoise's tree count comes to 128,068 trees across 12.14 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Cergy-Pontoise today: AQI 28, 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 · GENNEVILLIERS, 19.9 km away · median of 6 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
5.0
PM10
7.2
NO₂
15.4
O₃
49.2
SO₂
—
CO
—
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 Cergy-Pontoise's daily AQI at 72 on average, from 55 on Nov 4 to an hourly peak of 97 on Nov 7.
Where Cergy-Pontoise stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Cergy-Pontoise: Healthy tree cover
42.2% tree cover against a 30% healthy-neighborhood target, across 12.14 km² of land.
Trees in this area
128,068
Target trees
128,068
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Cergy-Pontoise lost?
Since 2001, the area within 10 km of Cergy-Pontoise has lost about 129 hectares of forest (about 180 football pitches): 1.9% of the forest it had in 2000. Most of it (52%) 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
- 129 haabout 180 football pitches
- Share of its forest
- 1.9%of what there was in 2000
- Cleared for good
- 68 hadeforestation: turned into farms, mines or towns
The worst year was 2001, when about 19 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 | 10 ha | 19 ha |
| 2002 | 2 ha | 4 ha | 6 ha |
| 2003 | 3 ha | 4 ha | 7 ha |
| 2004 | 3 ha | 1 ha | 4 ha |
| 2005 | 6 ha | 6 ha | 11 ha |
| 2006 | 2 ha | 1 ha | 4 ha |
| 2007 | 1 ha | 3 ha | 4 ha |
| 2008 | 6 ha | 11 ha | 17 ha |
| 2009 | 3 ha | 1 ha | 4 ha |
| 2010 | 6 ha | 5 ha | 11 ha |
| 2011 | 1 ha | 1 ha | 3 ha |
| 2012 | 3 ha | 2 ha | 6 ha |
| 2013 | 3 ha | 1 ha | 4 ha |
| 2014 | 1 ha | under 1 ha | 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | 1 ha | under 1 ha | 2 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | 3 ha | under 1 ha | 3 ha |
| 2019 | 5 ha | under 1 ha | 5 ha |
| 2020 | 1 ha | 2 ha | 3 ha |
| 2021 | 2 ha | under 1 ha | 3 ha |
| 2022 | 2 ha | under 1 ha | 2 ha |
| 2023 | 1 ha | 3 ha | 4 ha |
| 2024 | 4 ha | 3 ha | 6 ha |
| 2025 | under 1 ha | 1 ha | 1 ha |
What is causing deforestation around Cergy-Pontoise?
- Towns and roadscleared for good51% · 65 ha
- Loggingcan grow back31% · 39 ha
- Farms, pasture and plantationscleared for good1.9% · 2 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
- 8,810 ha
- Forest in 2020
- 9,120 ha
- Overall change
- +306 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Cergy-Pontoise grew from about 8,810 hectares to 9,120 hectares, a net gain of about 306 hectares (+3.5%). New forest grew on about 435 hectares, while 129 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 Cergy-Pontoise
Same 2 km radius, same index — so they compare directly.
- Argenteuil16.0 km
France
- Tree cover
- 24%
- Air quality
- 32
- Boulogne-Billancourt25.6 km
France
- Tree cover
- 30%
- Air quality
- 35
- Paris28.6 km
France
- Tree cover
- 13%
- Air quality
- 35
- 30.0 km
- Tree cover
- 48%
- Air quality
- 36
- Marne La Vallée47.0 km
France
- Tree cover
- 39%
- Air quality
- 36
- Rouen84.1 km
France
- Tree cover
- 36%
- Air quality
- 26
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Frequently asked
Questions about Cergy-Pontoise
What is the air quality (AQI) in Cergy-Pontoise right now?
The latest reading for Cergy-Pontoise shows an AQI of 28 (Good), measured Nov 11, 17:00 local time by 6 ground monitoring stations via OpenAQ (the median of their readings; the nearest is GENNEVILLIERS, 19.9 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Cergy-Pontoise 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 Cergy-Pontoise been like this week?
Over the last 7 days, the CAMS air-quality model put Cergy-Pontoise's daily AQI at 72 on average, from 55 on Nov 4 to an hourly peak of 97 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 Cergy-Pontoise lost since 2001?
Since 2001, the area within 10 km of Cergy-Pontoise has lost about 129 hectares of forest (about 180 football pitches): 1.9% of the forest it had in 2000. Most of it (52%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Cergy-Pontoise grew from about 8,810 hectares to 9,120 hectares, a net gain of about 306 hectares (+3.5%). New forest grew on about 435 hectares, while 129 hectares were lost.
What is the tree count in Cergy-Pontoise?
Cergy-Pontoise has an estimated 128,068 trees across the 12.14 km² of land measured — 42.2% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Cergy-Pontoise need?
Cergy-Pontoise has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Cergy-Pontoise's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Cergy, 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 Cergy; the tree count is an estimate derived from that cover.
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