City report · Mauritius
Port Louis Air quality today
Air quality in Port Louis currently reads AQI 20 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 20
Good
- PM2.5, fine particles (µg/m³)
- 3.6
- tree cover
- 27.8%
- trees in this area
- 80.0K
- more trees needed
- 6.3K
Measured across a 2 km radius around Les Salines, Port Louis, Mauritius (12.57 km²), from a satellite image of Sep 9, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Port Louis · AQI 20 (Good)
Port Louis's tree count comes to 80,000 trees across 11.51 km² of land, 2 points below the 30% tree-cover level considered healthy for this area, so roughly 6,331 more trees would close the gap.
Air quality detail
Air quality in Port Louis today: AQI 20, Good
Main pollutant: PM2.5 · Observed Nov 11, 19:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Pointe aux Sables, Mauritius, 6.4 km away
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.6
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, Airbag888
- 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 Port Louis's daily AQI at 37 on average, from 28 on Nov 10 to an hourly peak of 55 on Nov 6.
Where Port Louis stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Port Louis: Below target
27.8% tree cover against a 30% healthy-neighborhood target, across 11.51 km² of land.
Trees in this area
80,000
Target trees
86,331
More trees needed
6,331
CO₂ if planted / yr
139.3 t
Deforestation · 2001–2025
How much forest has Port Louis lost?
Since 2001, the area within 10 km of Port Louis has lost about 154 hectares of forest (about 220 football pitches): 2.5% of the forest it had in 2000. Most of it (92%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2018: satellite photo from August 2018 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 154 haabout 220 football pitches
- Share of its forest
- 2.5%of what there was in 2000
- Cleared for good
- 142 hadeforestation: turned into farms, mines or towns
The worst year was 2014, when about 38 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 | 7 ha | under 1 ha | 7 ha |
| 2002 | 7 ha | under 1 ha | 8 ha |
| 2003 | 5 ha | under 1 ha | 5 ha |
| 2004 | 11 ha | 1 ha | 12 ha |
| 2005 | 4 ha | under 1 ha | 4 ha |
| 2006 | 4 ha | under 1 ha | 4 ha |
| 2007 | 2 ha | under 1 ha | 3 ha |
| 2008 | 6 ha | under 1 ha | 6 ha |
| 2009 | 12 ha | under 1 ha | 13 ha |
| 2010 | under 1 ha | under 1 ha | 1 ha |
| 2011 | 22 ha | under 1 ha | 22 ha |
| 2012 | 6 ha | 1 ha | 8 ha |
| 2013 | 18 ha | 1 ha | 19 ha |
| 2014 | 35 ha | 3 ha | 38 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 | 3 ha | 1 ha | 4 ha |
What is causing deforestation around Port Louis?
- Farms, pasture and plantationscleared for good83% · 128 ha
- Towns and roadscleared for good9% · 14 ha
- Storms, floods and other natural causescan grow back1.4% · 2 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 Port Louis
Same 2 km radius, same index — so they compare directly.
- Saint-Benoît209.6 km
Reunion
- Tree cover
- 47%
- Air quality
- 11
- Saint-Denis227.9 km
Reunion
- Tree cover
- 38%
- Air quality
- 17
- Saint-Pierre247.6 km
Reunion
- Tree cover
- 31%
- Air quality
- 11
- Saint-Paul250.3 km
Reunion
- Tree cover
- 44%
- Air quality
- 27
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Frequently asked
Questions about Port Louis
What is the air quality (AQI) in Port Louis right now?
The latest reading for Port Louis shows an AQI of 20 (Good), measured Nov 11, 19:00 local time by the Pointe aux Sables, Mauritius ground monitoring station, 6.4 km away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Port Louis today?
At AQI 20 (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 Port Louis been like this week?
Over the last 7 days, the CAMS air-quality model put Port Louis's daily AQI at 37 on average, from 28 on Nov 10 to an hourly peak of 55 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Port Louis lost since 2001?
Since 2001, the area within 10 km of Port Louis has lost about 154 hectares of forest (about 220 football pitches): 2.5% of the forest it had in 2000. Most of it (92%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
What is the tree count in Port Louis?
Port Louis has an estimated 80,000 trees across the 11.51 km² of land measured — 27.8% tree cover, 2 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Port Louis need?
Port Louis needs roughly 6,331 more trees to close a 2-point shortfall against its 30% tree-cover target — about 139.3 t of extra CO₂ absorbed per year once grown.
How are Port Louis's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Les Salines, 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 Les Salines; the tree count is an estimate derived from that cover.
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