City report · Reunion
Saint-Pierre Air quality today
Air quality in Saint-Pierre currently reads AQI 16 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 16
Good
- PM2.5, fine particles (µg/m³)
- 2.5
- tree cover
- 31.2%
- trees in this area
- 72.6K
- more trees needed
- 0
Measured across a 2 km radius around Centre-Ville, Saint-Pierre 97410, Réunion (12.57 km²), from a satellite image of Sep 14, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Saint-Pierre · AQI 16 (Good)
Saint-Pierre's tree count comes to 72,631 trees across 9.31 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Saint-Pierre today: AQI 16, Good
Main pollutant: PM2.5 · Observed Nov 11, 04:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 250 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 2 station cities within 250 km, e.g. Vacoas-Phoenix and Port Louis
Health signal
Air quality is satisfactory for everyone.
PM2.5
2.5
PM10
5.6
NO₂
4.0
O₃
25.0
SO₂
1.2
CO
122.0
- 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-Pierre's daily AQI at 35 on average, from 23 on Nov 7 to an hourly peak of 48 on Nov 10.
Where Saint-Pierre stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Saint-Pierre: Healthy tree cover
31.2% tree cover against a 30% healthy-neighborhood target, across 9.31 km² of land.
Trees in this area
72,631
Target trees
72,631
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Saint-Pierre lost?
Since 2001, the area within 10 km of Saint-Pierre has lost about 961 hectares of forest (about 1,300 football pitches): 12% of the forest it had in 2000. Most of it (99%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 961 haabout 1,300 football pitches
- Share of its forest
- 12%of what there was in 2000
- Cleared for good
- 955 hadeforestation: turned into farms, mines or towns
The worst year was 2013, when about 281 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 | under 1 ha | under 1 ha |
| 2002 | 173 ha | 1 ha | 174 ha |
| 2003 | 31 ha | under 1 ha | 31 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | 14 ha | under 1 ha | 14 ha |
| 2006 | 42 ha | under 1 ha | 43 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | 8 ha | under 1 ha | 8 ha |
| 2010 | 15 ha | under 1 ha | 16 ha |
| 2011 | 100 ha | under 1 ha | 100 ha |
| 2012 | 167 ha | 1 ha | 168 ha |
| 2013 | 279 ha | 2 ha | 281 ha |
| 2014 | 67 ha | under 1 ha | 67 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 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 | 59 ha | under 1 ha | 60 ha |
What is causing deforestation around Saint-Pierre?
- Farms, pasture and plantationscleared for good97% · 937 ha
- Towns and roadscleared for good2% · 19 ha
Also: 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-Pierre
Same 2 km radius, same index — so they compare directly.
- Saint-Paul42.5 km
Reunion
- Tree cover
- 44%
- Air quality
- 27
- Vacoas238.0 km
Mauritius
- Tree cover
- 36%
- Air quality
- 10
- Port Louis247.6 km
Mauritius
- Tree cover
- 28%
- Air quality
- 45
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Frequently asked
Questions about Saint-Pierre
What is the air quality (AQI) in Saint-Pierre right now?
The latest reading for Saint-Pierre shows an AQI of 16 (Good), observed Nov 11, 04:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 250 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Saint-Pierre today?
At AQI 16 (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-Pierre been like this week?
Over the last 7 days, the CAMS air-quality model put Saint-Pierre's daily AQI at 35 on average, from 23 on Nov 7 to an hourly peak of 48 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-Pierre lost since 2001?
Since 2001, the area within 10 km of Saint-Pierre has lost about 961 hectares of forest (about 1,300 football pitches): 12% of the forest it had in 2000. Most of it (99%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
What is the tree count in Saint-Pierre?
Saint-Pierre has an estimated 72,631 trees across the 9.31 km² of land measured — 31.2% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Saint-Pierre need?
Saint-Pierre has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Saint-Pierre'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-Ville; the tree count is an estimate derived from that cover.
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