City report · Reunion
Saint-Denis Air quality today
Air quality in Saint-Denis currently reads AQI 23 (Good): Air quality is satisfactory for everyone.
AQI 23
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 3.9
- tree cover
- 37.8%
- trees in this area
- 82.4K
- more trees needed
- 0
Measured across a 2 km radius around Centre, Saint-Denis 97400, Réunion (12.57 km²), from a satellite image of Aug 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Saint-Denis · AQI 23 (Good)
Saint-Denis's tree count comes to 82,414 trees across 8.72 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Saint-Denis today: AQI 23, Good
Main pollutant: PM2.5 · Observed Nov 11, 04:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 245 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 2 station cities within 245 km, e.g. Vacoas-Phoenix and Port Louis
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.9
PM10
10.2
NO₂
1.0
O₃
37.0
SO₂
1.1
CO
90.0
- 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-Denis's daily AQI at 44 on average, from 32 on Nov 7 to an hourly peak of 53 on Nov 10.
Where Saint-Denis stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Saint-Denis: Healthy tree cover
37.8% tree cover against a 30% healthy-neighborhood target, across 8.72 km² of land.
Trees in this area
82,414
Target trees
82,414
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Saint-Denis lost?
Since 2001, the area within 10 km of Saint-Denis has lost about 147 hectares of forest (about 210 football pitches): 1.6% of the forest it had in 2000. The biggest cause was towns and roads (30%). About 73 hectares (50%) was deforestation: forest cleared for good for farms, mines or towns.
2018: satellite photo from July 2018 of a 5 × 5 km area about 7 km west of the city center.
- Forest lost since 2001
- 147 haabout 210 football pitches
- Share of its forest
- 1.6%of what there was in 2000
- Cleared for good
- 73 hadeforestation: turned into farms, mines or towns
The worst year was 2014, when about 45 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 | 4 ha | 4 ha |
| 2002 | 2 ha | 9 ha | 11 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | under 1 ha | under 1 ha | 1 ha |
| 2006 | 2 ha | 9 ha | 11 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | 1 ha | 3 ha | 4 ha |
| 2010 | 3 ha | 4 ha | 6 ha |
| 2011 | 8 ha | 4 ha | 12 ha |
| 2012 | 5 ha | 5 ha | 11 ha |
| 2013 | 6 ha | 5 ha | 10 ha |
| 2014 | 18 ha | 27 ha | 45 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | 1 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | 28 ha | 2 ha | 30 ha |
What is causing deforestation around Saint-Denis?
- Towns and roadscleared for good30% · 45 ha
- Shifting farmingcan grow back28% · 41 ha
- Farms, pasture and plantationscleared for good20% · 29 ha
Also: storms, floods and other natural causes, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
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. Images: contains modified Copernicus Sentinel data. How it's measured
In the same region
Measured cities near Saint-Denis
Same 2 km radius, same index — so they compare directly.
- Saint-Leu36.2 km
Reunion
- Tree cover
- 57%
- Air quality
- 32
- Vacoas220.9 km
Mauritius
- Tree cover
- 36%
- Air quality
- 10
- Port Louis227.9 km
Mauritius
- Tree cover
- 28%
- Air quality
- 45
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Frequently asked
Questions about Saint-Denis
What is the air quality (AQI) in Saint-Denis right now?
The latest reading for Saint-Denis shows an AQI of 23 (Good), observed Nov 11, 04:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 245 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Saint-Denis today?
At AQI 23 (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-Denis been like this week?
Over the last 7 days, the CAMS air-quality model put Saint-Denis's daily AQI at 44 on average, from 32 on Nov 7 to an hourly peak of 53 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 Saint-Denis lost since 2001?
Since 2001, the area within 10 km of Saint-Denis has lost about 147 hectares of forest (about 210 football pitches): 1.6% of the forest it had in 2000. The biggest cause was towns and roads (30%). About 73 hectares (50%) was deforestation: forest cleared for good for farms, mines or towns.
What is the tree count in Saint-Denis?
Saint-Denis has an estimated 82,414 trees across the 8.72 km² of land measured — 37.8% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Saint-Denis need?
Saint-Denis has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Saint-Denis's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. 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 Centre; the tree count is an estimate derived from that cover.
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