City report · Auvergne-Rhône-Alpes, France
Saint-Étienne Air quality today
Air quality in Saint-Étienne currently reads AQI 33 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 33
Good
- PM2.5, fine particles (µg/m³)
- 2.9
- tree cover
- 30.5%
- trees in this area
- 95.8K
- more trees needed
- 0
Measured across a 2 km radius around Saint-Roch - Badouillère - Chavanelle, Saint-Étienne, France (12.57 km²), from a satellite image of Sep 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Saint-Étienne · AQI 33 (Good)
Saint-Étienne's tree count comes to 95,819 trees across 12.57 km², already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Saint-Étienne today: AQI 33, Good
Main pollutant: Ozone · Observed Nov 11, 16:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · SAINT ETIENNE SUD, 1.6 km away · median of 3 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
2.9
PM10
5.1
NO₂
7.7
O₃
72.5
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 Saint-Étienne's daily AQI at 47 on average, from 22 on Nov 9 to an hourly peak of 90 on Nov 5.
Where Saint-Étienne stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Saint-Étienne: Healthy tree cover
30.5% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
95,819
Target trees
95,819
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Saint-Étienne lost?
Since 2001, the area within 10 km of Saint-Étienne has lost about 957 hectares of forest (about 1,300 football pitches): 8.9% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 31 hectares (3.2%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km southeast of the city center.
- Forest lost since 2001
- 957 haabout 1,300 football pitches
- Share of its forest
- 8.9%of what there was in 2000
- Cleared for good
- 31 hadeforestation: turned into farms, mines or towns
Forest loss has stayed about the same: about 65 hectares a year in 2021–2025, against 56 hectares a year in 2016–2020. The worst year was 2021, when about 113 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 | 5 ha | 6 ha |
| 2002 | under 1 ha | 8 ha | 8 ha |
| 2003 | 2 ha | 13 ha | 15 ha |
| 2004 | under 1 ha | 17 ha | 18 ha |
| 2005 | under 1 ha | 16 ha | 17 ha |
| 2006 | 5 ha | 30 ha | 34 ha |
| 2007 | 1 ha | 25 ha | 26 ha |
| 2008 | under 1 ha | 20 ha | 20 ha |
| 2009 | 3 ha | 27 ha | 30 ha |
| 2010 | 1 ha | 26 ha | 27 ha |
| 2011 | 2 ha | 13 ha | 14 ha |
| 2012 | under 1 ha | 36 ha | 37 ha |
| 2013 | under 1 ha | 29 ha | 29 ha |
| 2014 | under 1 ha | 38 ha | 38 ha |
| 2015 | under 1 ha | 36 ha | 37 ha |
| 2016 | under 1 ha | 41 ha | 42 ha |
| 2017 | 5 ha | 61 ha | 65 ha |
| 2018 | under 1 ha | 58 ha | 59 ha |
| 2019 | 1 ha | 61 ha | 62 ha |
| 2020 | under 1 ha | 50 ha | 51 ha |
| 2021 | 5 ha | 108 ha | 113 ha |
| 2022 | 1 ha | 39 ha | 40 ha |
| 2023 | under 1 ha | 32 ha | 32 ha |
| 2024 | 1 ha | 94 ha | 95 ha |
| 2025 | under 1 ha | 44 ha | 44 ha |
What is causing deforestation around Saint-Étienne?
- Loggingcan grow back95% · 906 ha
- Towns and roadscleared for good2.5% · 24 ha
- Unknown causescause unknown2.3% · 22 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
- 14,400 ha
- Forest in 2020
- 14,700 ha
- Overall change
- +311 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Saint-Étienne grew from about 14,400 hectares to 14,700 hectares, a net gain of about 311 hectares (+2.2%). New forest grew on about 485 hectares, while 174 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 Saint-Étienne
Same 2 km radius, same index — so they compare directly.
- Lyon50.0 km
France
- Tree cover
- 12%
- Air quality
- 29
- Grenoble107.4 km
France
- Tree cover
- 21%
- Air quality
- 32
- Clermont-Ferrand108.4 km
France
- Tree cover
- 18%
- Air quality
- 54
- Geneva160.7 km
Switzerland
- Tree cover
- 27%
- Air quality
- 19
- Nîmes177.6 km
France
- Tree cover
- 34%
- Air quality
- 52
- Montpellier206.8 km
France
- Tree cover
- 29%
- Air quality
- 53
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Frequently asked
Questions about Saint-Étienne
What is the air quality (AQI) in Saint-Étienne right now?
The latest reading for Saint-Étienne shows an AQI of 33 (Good), measured Nov 11, 16:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is SAINT ETIENNE SUD, 1.6 km away). The main pollutant is Ozone. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Saint-Étienne today?
At AQI 33 (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 Saint-Étienne been like this week?
Over the last 7 days, the CAMS air-quality model put Saint-Étienne's daily AQI at 47 on average, from 22 on Nov 9 to an hourly peak of 90 on Nov 5. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Saint-Étienne lost since 2001?
Since 2001, the area within 10 km of Saint-Étienne has lost about 957 hectares of forest (about 1,300 football pitches): 8.9% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 31 hectares (3.2%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss has stayed about the same: about 65 hectares a year in 2021–2025, against 56 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Saint-Étienne grew from about 14,400 hectares to 14,700 hectares, a net gain of about 311 hectares (+2.2%). New forest grew on about 485 hectares, while 174 hectares were lost.
What is the tree count in Saint-Étienne?
Saint-Étienne has an estimated 95,819 trees across the 12.57 km² measured — 30.5% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Saint-Étienne need?
Saint-Étienne has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Saint-Étienne's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Saint-Roch - Badouillère - Chavanelle, 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 Saint-Roch - Badouillère - Chavanelle; the tree count is an estimate derived from that cover.
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