City report · Saint Lucia
Castries Air quality today
Air quality in Castries currently reads AQI 28 (Good): Air quality is satisfactory for everyone.
AQI 28
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 4.9
- tree cover
- 77.0%
- trees in this area
- 179K
- more trees needed
- 0
Measured across a 2 km radius around Ciceron, St Lucia (12.57 km²), from a satellite image of Sep 19, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Castries · AQI 28 (Good)
Castries's tree count comes to 179,492 trees across 9.33 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Castries today: AQI 28, Good
Main pollutant: PM2.5 · Observed Nov 10, 13:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.
Model estimate · no ground station nearby
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.9
PM10
8.4
NO₂
0.2
O₃
37.0
SO₂
0.7
CO
101.0
- 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 Castries's daily AQI at 47 on average, from 31 on Nov 10 to an hourly peak of 72 on Nov 4.
Where Castries stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Castries: Healthy tree cover
77.0% tree cover against a 30% healthy-neighborhood target, across 9.33 km² of land.
Trees in this area
179,492
Target trees
179,492
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Castries lost?
Since 2001, the area within 10 km of Castries has lost about 382 hectares of forest (about 540 football pitches): 2.8% of the forest it had in 2000. Most of it (83%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from February 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 382 haabout 540 football pitches
- Share of its forest
- 2.8%of what there was in 2000
- Cleared for good
- 318 hadeforestation: turned into farms, mines or towns
The worst year was 2010, when about 45 hectares of forest were lost.
Castries's full deforestation reportHectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 11 ha | under 1 ha | 12 ha |
| 2002 | 3 ha | 2 ha | 5 ha |
| 2003 | 9 ha | under 1 ha | 10 ha |
| 2004 | 11 ha | 2 ha | 14 ha |
| 2005 | 18 ha | under 1 ha | 19 ha |
| 2006 | 10 ha | 1 ha | 11 ha |
| 2007 | 14 ha | 3 ha | 16 ha |
| 2008 | 14 ha | 1 ha | 15 ha |
| 2009 | 25 ha | 1 ha | 26 ha |
| 2010 | 42 ha | 3 ha | 45 ha |
| 2011 | 16 ha | 5 ha | 21 ha |
| 2012 | 24 ha | 4 ha | 28 ha |
| 2013 | 10 ha | 3 ha | 12 ha |
| 2014 | 9 ha | 2 ha | 11 ha |
| 2015 | 2 ha | under 1 ha | 2 ha |
| 2016 | 20 ha | 17 ha | 37 ha |
| 2017 | 18 ha | 9 ha | 27 ha |
| 2018 | 6 ha | 6 ha | 12 ha |
| 2019 | 6 ha | 1 ha | 7 ha |
| 2020 | 11 ha | 2 ha | 13 ha |
| 2021 | 10 ha | under 1 ha | 10 ha |
| 2022 | 9 ha | 1 ha | 10 ha |
| 2023 | 9 ha | under 1 ha | 9 ha |
| 2024 | 4 ha | under 1 ha | 4 ha |
| 2025 | 9 ha | under 1 ha | 9 ha |
What is causing deforestation around Castries?
- Towns and roadscleared for good48% · 182 ha
- Farms, pasture and plantationscleared for good36% · 136 ha
- Storms, floods and other natural causescan grow back13% · 50 ha
Also: shifting farming, 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
- 14,200 ha
- Forest in 2020
- 14,000 ha
- Overall change
- −278 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Castries stayed about the same size, at about 14,000 hectares: new forest grew on about 44 hectares, and about 321 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 Castries
Same 2 km radius, same index — so they compare directly.
- Fort-de-France68.0 km
Martinique
- Tree cover
- 30%
- Air quality
- 19
- Kingstown96.5 km
Saint Vincent and the Grenadines
- Tree cover
- 63%
- Air quality
- 25
- Roseau150.9 km
Dominica
- Tree cover
- 62%
- Air quality
- 34
- Bridgetown179.5 km
Barbados
- Tree cover
- 13%
- Air quality
- 23
- Saint George's230.7 km
Grenada
- Tree cover
- 66%
- Air quality
- 39
- Basse-Terre235.8 km
Guadeloupe
- Tree cover
- 49%
- Air quality
- 25
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Frequently asked
Questions about Castries
What is the air quality (AQI) in Castries right now?
The latest reading for Castries shows an AQI of 28 (Good), observed Nov 10, 13:00 local time via Open-Meteo / CAMS, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Castries 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 Castries been like this week?
Over the last 7 days, the CAMS air-quality model put Castries's daily AQI at 47 on average, from 31 on Nov 10 to an hourly peak of 72 on Nov 4. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Castries lost since 2001?
Since 2001, the area within 10 km of Castries has lost about 382 hectares of forest (about 540 football pitches): 2.8% of the forest it had in 2000. Most of it (83%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Castries stayed about the same size, at about 14,000 hectares: new forest grew on about 44 hectares, and about 321 hectares were lost.
What is the tree count in Castries?
Castries has an estimated 179,492 trees across the 9.33 km² of land measured — 77.0% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Castries need?
Castries has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Castries'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 Ciceron; the tree count is an estimate derived from that cover.
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